From 3d6357de8aa09e1966770dc1171c72679946464f Mon Sep 17 00:00:00 2001 From: Arun KS Date: Fri, 28 Dec 2018 00:34:20 -0800 Subject: mm: reference totalram_pages and managed_pages once per function Patch series "mm: convert totalram_pages, totalhigh_pages and managed pages to atomic", v5. This series converts totalram_pages, totalhigh_pages and zone->managed_pages to atomic variables. totalram_pages, zone->managed_pages and totalhigh_pages updates are protected by managed_page_count_lock, but readers never care about it. Convert these variables to atomic to avoid readers potentially seeing a store tear. Main motivation was that managed_page_count_lock handling was complicating things. It was discussed in length here, https://lore.kernel.org/patchwork/patch/995739/#1181785 It seemes better to remove the lock and convert variables to atomic. With the change, preventing poteintial store-to-read tearing comes as a bonus. This patch (of 4): This is in preparation to a later patch which converts totalram_pages and zone->managed_pages to atomic variables. Please note that re-reading the value might lead to a different value and as such it could lead to unexpected behavior. There are no known bugs as a result of the current code but it is better to prevent from them in principle. Link: http://lkml.kernel.org/r/1542090790-21750-2-git-send-email-arunks@codeaurora.org Signed-off-by: Arun KS Reviewed-by: Konstantin Khlebnikov Reviewed-by: David Hildenbrand Acked-by: Michal Hocko Acked-by: Vlastimil Babka Reviewed-by: Pavel Tatashin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/fork.c | 5 +++-- kernel/kexec_core.c | 5 +++-- 2 files changed, 6 insertions(+), 4 deletions(-) (limited to 'kernel') diff --git a/kernel/fork.c b/kernel/fork.c index e2a5156bc9c3..8617a326e9f5 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -744,15 +744,16 @@ void __init __weak arch_task_cache_init(void) { } static void set_max_threads(unsigned int max_threads_suggested) { u64 threads; + unsigned long nr_pages = totalram_pages; /* * The number of threads shall be limited such that the thread * structures may only consume a small part of the available memory. */ - if (fls64(totalram_pages) + fls64(PAGE_SIZE) > 64) + if (fls64(nr_pages) + fls64(PAGE_SIZE) > 64) threads = MAX_THREADS; else - threads = div64_u64((u64) totalram_pages * (u64) PAGE_SIZE, + threads = div64_u64((u64) nr_pages * (u64) PAGE_SIZE, (u64) THREAD_SIZE * 8UL); if (threads > max_threads_suggested) diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index 86ef06d3dbe3..7e967ca98d92 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -152,6 +152,7 @@ int sanity_check_segment_list(struct kimage *image) int i; unsigned long nr_segments = image->nr_segments; unsigned long total_pages = 0; + unsigned long nr_pages = totalram_pages; /* * Verify we have good destination addresses. The caller is @@ -217,13 +218,13 @@ int sanity_check_segment_list(struct kimage *image) * wasted allocating pages, which can cause a soft lockup. */ for (i = 0; i < nr_segments; i++) { - if (PAGE_COUNT(image->segment[i].memsz) > totalram_pages / 2) + if (PAGE_COUNT(image->segment[i].memsz) > nr_pages / 2) return -EINVAL; total_pages += PAGE_COUNT(image->segment[i].memsz); } - if (total_pages > totalram_pages / 2) + if (total_pages > nr_pages / 2) return -EINVAL; /* -- cgit v1.2.3-59-g8ed1b From ca79b0c211af63fa3276f0e3fd7dd9ada2439839 Mon Sep 17 00:00:00 2001 From: Arun KS Date: Fri, 28 Dec 2018 00:34:29 -0800 Subject: mm: convert totalram_pages and totalhigh_pages variables to atomic totalram_pages and totalhigh_pages are made static inline function. Main motivation was that managed_page_count_lock handling was complicating things. It was discussed in length here, https://lore.kernel.org/patchwork/patch/995739/#1181785 So it seemes better to remove the lock and convert variables to atomic, with preventing poteintial store-to-read tearing as a bonus. [akpm@linux-foundation.org: coding style fixes] Link: http://lkml.kernel.org/r/1542090790-21750-4-git-send-email-arunks@codeaurora.org Signed-off-by: Arun KS Suggested-by: Michal Hocko Suggested-by: Vlastimil Babka Reviewed-by: Konstantin Khlebnikov Reviewed-by: Pavel Tatashin Acked-by: Michal Hocko Acked-by: Vlastimil Babka Cc: David Hildenbrand Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/csky/mm/init.c | 4 ++-- arch/powerpc/platforms/pseries/cmm.c | 10 +++++----- arch/s390/mm/init.c | 2 +- arch/um/kernel/mem.c | 2 +- arch/x86/kernel/cpu/microcode/core.c | 2 +- drivers/char/agp/backend.c | 4 ++-- drivers/gpu/drm/i915/i915_gem.c | 2 +- drivers/gpu/drm/i915/selftests/i915_gem_gtt.c | 4 ++-- drivers/hv/hv_balloon.c | 2 +- drivers/md/dm-bufio.c | 2 +- drivers/md/dm-crypt.c | 2 +- drivers/md/dm-integrity.c | 2 +- drivers/md/dm-stats.c | 2 +- drivers/media/platform/mtk-vpu/mtk_vpu.c | 2 +- drivers/misc/vmw_balloon.c | 2 +- drivers/parisc/ccio-dma.c | 4 ++-- drivers/parisc/sba_iommu.c | 4 ++-- drivers/staging/android/ion/ion_system_heap.c | 2 +- drivers/xen/xen-selfballoon.c | 6 +++--- fs/ceph/super.h | 2 +- fs/file_table.c | 2 +- fs/fuse/inode.c | 2 +- fs/nfs/write.c | 2 +- fs/nfsd/nfscache.c | 2 +- fs/ntfs/malloc.h | 2 +- fs/proc/base.c | 2 +- include/linux/highmem.h | 28 +++++++++++++++++++++++++-- include/linux/mm.h | 27 +++++++++++++++++++++++++- include/linux/swap.h | 1 - kernel/fork.c | 2 +- kernel/kexec_core.c | 2 +- kernel/power/snapshot.c | 2 +- mm/highmem.c | 5 ++--- mm/huge_memory.c | 2 +- mm/kasan/quarantine.c | 2 +- mm/memblock.c | 4 ++-- mm/mm_init.c | 2 +- mm/oom_kill.c | 2 +- mm/page_alloc.c | 20 ++++++++++--------- mm/shmem.c | 9 +++++---- mm/slab.c | 2 +- mm/swap.c | 2 +- mm/util.c | 2 +- mm/vmalloc.c | 4 ++-- mm/workingset.c | 2 +- mm/zswap.c | 4 ++-- net/dccp/proto.c | 2 +- net/decnet/dn_route.c | 2 +- net/ipv4/tcp_metrics.c | 2 +- net/netfilter/nf_conntrack_core.c | 2 +- net/netfilter/xt_hashlimit.c | 2 +- net/sctp/protocol.c | 2 +- security/integrity/ima/ima_kexec.c | 2 +- 53 files changed, 131 insertions(+), 81 deletions(-) (limited to 'kernel') diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c index dc07c078f9b8..66e597053488 100644 --- a/arch/csky/mm/init.c +++ b/arch/csky/mm/init.c @@ -71,7 +71,7 @@ void free_initrd_mem(unsigned long start, unsigned long end) ClearPageReserved(virt_to_page(start)); init_page_count(virt_to_page(start)); free_page(start); - totalram_pages++; + totalram_pages_inc(); } } #endif @@ -88,7 +88,7 @@ void free_initmem(void) ClearPageReserved(virt_to_page(addr)); init_page_count(virt_to_page(addr)); free_page(addr); - totalram_pages++; + totalram_pages_inc(); addr += PAGE_SIZE; } diff --git a/arch/powerpc/platforms/pseries/cmm.c b/arch/powerpc/platforms/pseries/cmm.c index 25427a48feae..e8d63a6a9002 100644 --- a/arch/powerpc/platforms/pseries/cmm.c +++ b/arch/powerpc/platforms/pseries/cmm.c @@ -208,7 +208,7 @@ static long cmm_alloc_pages(long nr) pa->page[pa->index++] = addr; loaned_pages++; - totalram_pages--; + totalram_pages_dec(); spin_unlock(&cmm_lock); nr--; } @@ -247,7 +247,7 @@ static long cmm_free_pages(long nr) free_page(addr); loaned_pages--; nr--; - totalram_pages++; + totalram_pages_inc(); } spin_unlock(&cmm_lock); cmm_dbg("End request with %ld pages unfulfilled\n", nr); @@ -291,7 +291,7 @@ static void cmm_get_mpp(void) int rc; struct hvcall_mpp_data mpp_data; signed long active_pages_target, page_loan_request, target; - signed long total_pages = totalram_pages + loaned_pages; + signed long total_pages = totalram_pages() + loaned_pages; signed long min_mem_pages = (min_mem_mb * 1024 * 1024) / PAGE_SIZE; rc = h_get_mpp(&mpp_data); @@ -322,7 +322,7 @@ static void cmm_get_mpp(void) cmm_dbg("delta = %ld, loaned = %lu, target = %lu, oom = %lu, totalram = %lu\n", page_loan_request, loaned_pages, loaned_pages_target, - oom_freed_pages, totalram_pages); + oom_freed_pages, totalram_pages()); } static struct notifier_block cmm_oom_nb = { @@ -581,7 +581,7 @@ static int cmm_mem_going_offline(void *arg) free_page(pa_curr->page[idx]); freed++; loaned_pages--; - totalram_pages++; + totalram_pages_inc(); pa_curr->page[idx] = pa_last->page[--pa_last->index]; if (pa_last->index == 0) { if (pa_curr == pa_last) diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 76d0708438e9..50388190b393 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -59,7 +59,7 @@ static void __init setup_zero_pages(void) order = 7; /* Limit number of empty zero pages for small memory sizes */ - while (order > 2 && (totalram_pages >> 10) < (1UL << order)) + while (order > 2 && (totalram_pages() >> 10) < (1UL << order)) order--; empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order); diff --git a/arch/um/kernel/mem.c b/arch/um/kernel/mem.c index 2da209687a22..8d21a83dd289 100644 --- a/arch/um/kernel/mem.c +++ b/arch/um/kernel/mem.c @@ -51,7 +51,7 @@ void __init mem_init(void) /* this will put all low memory onto the freelists */ memblock_free_all(); - max_low_pfn = totalram_pages; + max_low_pfn = totalram_pages(); max_pfn = max_low_pfn; mem_init_print_info(NULL); kmalloc_ok = 1; diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c index 168fa272cc3e..97f9ada9ceda 100644 --- a/arch/x86/kernel/cpu/microcode/core.c +++ b/arch/x86/kernel/cpu/microcode/core.c @@ -434,7 +434,7 @@ static ssize_t microcode_write(struct file *file, const char __user *buf, size_t len, loff_t *ppos) { ssize_t ret = -EINVAL; - unsigned long nr_pages = totalram_pages; + unsigned long nr_pages = totalram_pages(); if ((len >> PAGE_SHIFT) > nr_pages) { pr_err("too much data (max %ld pages)\n", nr_pages); diff --git a/drivers/char/agp/backend.c b/drivers/char/agp/backend.c index 38ffb281df97..004a3ce8ba72 100644 --- a/drivers/char/agp/backend.c +++ b/drivers/char/agp/backend.c @@ -115,9 +115,9 @@ static int agp_find_max(void) long memory, index, result; #if PAGE_SHIFT < 20 - memory = totalram_pages >> (20 - PAGE_SHIFT); + memory = totalram_pages() >> (20 - PAGE_SHIFT); #else - memory = totalram_pages << (PAGE_SHIFT - 20); + memory = totalram_pages() << (PAGE_SHIFT - 20); #endif index = 1; diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index d36a9755ad91..a9de07bb72c8 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -2559,7 +2559,7 @@ static int i915_gem_object_get_pages_gtt(struct drm_i915_gem_object *obj) * If there's no chance of allocating enough pages for the whole * object, bail early. */ - if (page_count > totalram_pages) + if (page_count > totalram_pages()) return -ENOMEM; st = kmalloc(sizeof(*st), GFP_KERNEL); diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c index 69fe86b30fbb..a9ed0ecc94e2 100644 --- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c @@ -170,7 +170,7 @@ static int igt_ppgtt_alloc(void *arg) * This should ensure that we do not run into the oomkiller during * the test and take down the machine wilfully. */ - limit = totalram_pages << PAGE_SHIFT; + limit = totalram_pages() << PAGE_SHIFT; limit = min(ppgtt->vm.total, limit); /* Check we can allocate the entire range */ @@ -1244,7 +1244,7 @@ static int exercise_mock(struct drm_i915_private *i915, u64 hole_start, u64 hole_end, unsigned long end_time)) { - const u64 limit = totalram_pages << PAGE_SHIFT; + const u64 limit = totalram_pages() << PAGE_SHIFT; struct i915_gem_context *ctx; struct i915_hw_ppgtt *ppgtt; IGT_TIMEOUT(end_time); diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c index f3e7da981610..5301fef16c31 100644 --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -1090,7 +1090,7 @@ static void process_info(struct hv_dynmem_device *dm, struct dm_info_msg *msg) static unsigned long compute_balloon_floor(void) { unsigned long min_pages; - unsigned long nr_pages = totalram_pages; + unsigned long nr_pages = totalram_pages(); #define MB2PAGES(mb) ((mb) << (20 - PAGE_SHIFT)) /* Simple continuous piecewiese linear function: * max MiB -> min MiB gradient diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c index dc385b70e4c3..8b0b628e5d1c 100644 --- a/drivers/md/dm-bufio.c +++ b/drivers/md/dm-bufio.c @@ -1887,7 +1887,7 @@ static int __init dm_bufio_init(void) dm_bufio_allocated_vmalloc = 0; dm_bufio_current_allocated = 0; - mem = (__u64)mult_frac(totalram_pages - totalhigh_pages, + mem = (__u64)mult_frac(totalram_pages() - totalhigh_pages(), DM_BUFIO_MEMORY_PERCENT, 100) << PAGE_SHIFT; if (mem > ULONG_MAX) diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c index a7195eb5b8d8..a8c32de29e3f 100644 --- a/drivers/md/dm-crypt.c +++ b/drivers/md/dm-crypt.c @@ -2158,7 +2158,7 @@ static int crypt_wipe_key(struct crypt_config *cc) static void crypt_calculate_pages_per_client(void) { - unsigned long pages = (totalram_pages - totalhigh_pages) * DM_CRYPT_MEMORY_PERCENT / 100; + unsigned long pages = (totalram_pages() - totalhigh_pages()) * DM_CRYPT_MEMORY_PERCENT / 100; if (!dm_crypt_clients_n) return; diff --git a/drivers/md/dm-integrity.c b/drivers/md/dm-integrity.c index d4ad0bfee251..62baa3214cc7 100644 --- a/drivers/md/dm-integrity.c +++ b/drivers/md/dm-integrity.c @@ -2843,7 +2843,7 @@ static int create_journal(struct dm_integrity_c *ic, char **error) journal_pages = roundup((__u64)ic->journal_sections * ic->journal_section_sectors, PAGE_SIZE >> SECTOR_SHIFT) >> (PAGE_SHIFT - SECTOR_SHIFT); journal_desc_size = journal_pages * sizeof(struct page_list); - if (journal_pages >= totalram_pages - totalhigh_pages || journal_desc_size > ULONG_MAX) { + if (journal_pages >= totalram_pages() - totalhigh_pages() || journal_desc_size > ULONG_MAX) { *error = "Journal doesn't fit into memory"; r = -ENOMEM; goto bad; diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c index 21de30b4e2a1..45b92a3d9d8e 100644 --- a/drivers/md/dm-stats.c +++ b/drivers/md/dm-stats.c @@ -85,7 +85,7 @@ static bool __check_shared_memory(size_t alloc_size) a = shared_memory_amount + alloc_size; if (a < shared_memory_amount) return false; - if (a >> PAGE_SHIFT > totalram_pages / DM_STATS_MEMORY_FACTOR) + if (a >> PAGE_SHIFT > totalram_pages() / DM_STATS_MEMORY_FACTOR) return false; #ifdef CONFIG_MMU if (a > (VMALLOC_END - VMALLOC_START) / DM_STATS_VMALLOC_FACTOR) diff --git a/drivers/media/platform/mtk-vpu/mtk_vpu.c b/drivers/media/platform/mtk-vpu/mtk_vpu.c index 616f78b24a79..b6602490a247 100644 --- a/drivers/media/platform/mtk-vpu/mtk_vpu.c +++ b/drivers/media/platform/mtk-vpu/mtk_vpu.c @@ -855,7 +855,7 @@ static int mtk_vpu_probe(struct platform_device *pdev) /* Set PTCM to 96K and DTCM to 32K */ vpu_cfg_writel(vpu, 0x2, VPU_TCM_CFG); - vpu->enable_4GB = !!(totalram_pages > (SZ_2G >> PAGE_SHIFT)); + vpu->enable_4GB = !!(totalram_pages() > (SZ_2G >> PAGE_SHIFT)); dev_info(dev, "4GB mode %u\n", vpu->enable_4GB); if (vpu->enable_4GB) { diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c index 9b0b3fa4f836..e6126a4b95d3 100644 --- a/drivers/misc/vmw_balloon.c +++ b/drivers/misc/vmw_balloon.c @@ -570,7 +570,7 @@ static int vmballoon_send_get_target(struct vmballoon *b) unsigned long status; unsigned long limit; - limit = totalram_pages; + limit = totalram_pages(); /* Ensure limit fits in 32-bits */ if (limit != (u32)limit) diff --git a/drivers/parisc/ccio-dma.c b/drivers/parisc/ccio-dma.c index 701a7d6a74d5..358e380eb7fa 100644 --- a/drivers/parisc/ccio-dma.c +++ b/drivers/parisc/ccio-dma.c @@ -1251,7 +1251,7 @@ ccio_ioc_init(struct ioc *ioc) ** Hot-Plug/Removal of PCI cards. (aka PCI OLARD). */ - iova_space_size = (u32) (totalram_pages / count_parisc_driver(&ccio_driver)); + iova_space_size = (u32) (totalram_pages() / count_parisc_driver(&ccio_driver)); /* limit IOVA space size to 1MB-1GB */ @@ -1290,7 +1290,7 @@ ccio_ioc_init(struct ioc *ioc) DBG_INIT("%s() hpa 0x%p mem %luMB IOV %dMB (%d bits)\n", __func__, ioc->ioc_regs, - (unsigned long) totalram_pages >> (20 - PAGE_SHIFT), + (unsigned long) totalram_pages() >> (20 - PAGE_SHIFT), iova_space_size>>20, iov_order + PAGE_SHIFT); diff --git a/drivers/parisc/sba_iommu.c b/drivers/parisc/sba_iommu.c index c1e599a429af..e0655949480a 100644 --- a/drivers/parisc/sba_iommu.c +++ b/drivers/parisc/sba_iommu.c @@ -1414,7 +1414,7 @@ sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num) ** for DMA hints - ergo only 30 bits max. */ - iova_space_size = (u32) (totalram_pages/global_ioc_cnt); + iova_space_size = (u32) (totalram_pages()/global_ioc_cnt); /* limit IOVA space size to 1MB-1GB */ if (iova_space_size < (1 << (20 - PAGE_SHIFT))) { @@ -1439,7 +1439,7 @@ sba_ioc_init(struct parisc_device *sba, struct ioc *ioc, int ioc_num) DBG_INIT("%s() hpa 0x%lx mem %ldMB IOV %dMB (%d bits)\n", __func__, ioc->ioc_hpa, - (unsigned long) totalram_pages >> (20 - PAGE_SHIFT), + (unsigned long) totalram_pages() >> (20 - PAGE_SHIFT), iova_space_size>>20, iov_order + PAGE_SHIFT); diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c index 548bb02c0ca6..6cb0eebdff89 100644 --- a/drivers/staging/android/ion/ion_system_heap.c +++ b/drivers/staging/android/ion/ion_system_heap.c @@ -110,7 +110,7 @@ static int ion_system_heap_allocate(struct ion_heap *heap, unsigned long size_remaining = PAGE_ALIGN(size); unsigned int max_order = orders[0]; - if (size / PAGE_SIZE > totalram_pages / 2) + if (size / PAGE_SIZE > totalram_pages() / 2) return -ENOMEM; INIT_LIST_HEAD(&pages); diff --git a/drivers/xen/xen-selfballoon.c b/drivers/xen/xen-selfballoon.c index 5165aa82bf7d..246f6122c9ee 100644 --- a/drivers/xen/xen-selfballoon.c +++ b/drivers/xen/xen-selfballoon.c @@ -189,7 +189,7 @@ static void selfballoon_process(struct work_struct *work) bool reset_timer = false; if (xen_selfballooning_enabled) { - cur_pages = totalram_pages; + cur_pages = totalram_pages(); tgt_pages = cur_pages; /* default is no change */ goal_pages = vm_memory_committed() + totalreserve_pages + @@ -227,7 +227,7 @@ static void selfballoon_process(struct work_struct *work) if (tgt_pages < floor_pages) tgt_pages = floor_pages; balloon_set_new_target(tgt_pages + - balloon_stats.current_pages - totalram_pages); + balloon_stats.current_pages - totalram_pages()); reset_timer = true; } #ifdef CONFIG_FRONTSWAP @@ -569,7 +569,7 @@ int xen_selfballoon_init(bool use_selfballooning, bool use_frontswap_selfshrink) * much more reliably and response faster in some cases. */ if (!selfballoon_reserved_mb) { - reserve_pages = totalram_pages / 10; + reserve_pages = totalram_pages() / 10; selfballoon_reserved_mb = PAGES2MB(reserve_pages); } schedule_delayed_work(&selfballoon_worker, selfballoon_interval * HZ); diff --git a/fs/ceph/super.h b/fs/ceph/super.h index 79a265ba9200..dfb64a5211b6 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -810,7 +810,7 @@ static inline int default_congestion_kb(void) * This allows larger machines to have larger/more transfers. * Limit the default to 256M */ - congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); + congestion_kb = (16*int_sqrt(totalram_pages())) << (PAGE_SHIFT-10); if (congestion_kb > 256*1024) congestion_kb = 256*1024; diff --git a/fs/file_table.c b/fs/file_table.c index b6e9587f05c7..5679e7fcb6b0 100644 --- a/fs/file_table.c +++ b/fs/file_table.c @@ -380,7 +380,7 @@ void __init files_init(void) void __init files_maxfiles_init(void) { unsigned long n; - unsigned long nr_pages = totalram_pages; + unsigned long nr_pages = totalram_pages(); unsigned long memreserve = (nr_pages - nr_free_pages()) * 3/2; memreserve = min(memreserve, nr_pages - 1); diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c index 568abed20eb2..76baaa6be393 100644 --- a/fs/fuse/inode.c +++ b/fs/fuse/inode.c @@ -824,7 +824,7 @@ static const struct super_operations fuse_super_operations = { static void sanitize_global_limit(unsigned *limit) { if (*limit == 0) - *limit = ((totalram_pages << PAGE_SHIFT) >> 13) / + *limit = ((totalram_pages() << PAGE_SHIFT) >> 13) / sizeof(struct fuse_req); if (*limit >= 1 << 16) diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 586726a590d8..4f15665f0ad1 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -2121,7 +2121,7 @@ int __init nfs_init_writepagecache(void) * This allows larger machines to have larger/more transfers. * Limit the default to 256M */ - nfs_congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); + nfs_congestion_kb = (16*int_sqrt(totalram_pages())) << (PAGE_SHIFT-10); if (nfs_congestion_kb > 256*1024) nfs_congestion_kb = 256*1024; diff --git a/fs/nfsd/nfscache.c b/fs/nfsd/nfscache.c index e2fe0e9ce0df..da52b594362a 100644 --- a/fs/nfsd/nfscache.c +++ b/fs/nfsd/nfscache.c @@ -99,7 +99,7 @@ static unsigned int nfsd_cache_size_limit(void) { unsigned int limit; - unsigned long low_pages = totalram_pages - totalhigh_pages; + unsigned long low_pages = totalram_pages() - totalhigh_pages(); limit = (16 * int_sqrt(low_pages)) << (PAGE_SHIFT-10); return min_t(unsigned int, limit, 256*1024); diff --git a/fs/ntfs/malloc.h b/fs/ntfs/malloc.h index ab172e5f51d9..5becc8acc8f4 100644 --- a/fs/ntfs/malloc.h +++ b/fs/ntfs/malloc.h @@ -47,7 +47,7 @@ static inline void *__ntfs_malloc(unsigned long size, gfp_t gfp_mask) return kmalloc(PAGE_SIZE, gfp_mask & ~__GFP_HIGHMEM); /* return (void *)__get_free_page(gfp_mask); */ } - if (likely((size >> PAGE_SHIFT) < totalram_pages)) + if (likely((size >> PAGE_SHIFT) < totalram_pages())) return __vmalloc(size, gfp_mask, PAGE_KERNEL); return NULL; } diff --git a/fs/proc/base.c b/fs/proc/base.c index ce3465479447..d7fd1ca807d2 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -530,7 +530,7 @@ static const struct file_operations proc_lstats_operations = { static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns, struct pid *pid, struct task_struct *task) { - unsigned long totalpages = totalram_pages + total_swap_pages; + unsigned long totalpages = totalram_pages() + total_swap_pages; unsigned long points = 0; points = oom_badness(task, NULL, NULL, totalpages) * diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 0690679832d4..ea5cdbd8c2c3 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -36,7 +36,31 @@ static inline void invalidate_kernel_vmap_range(void *vaddr, int size) /* declarations for linux/mm/highmem.c */ unsigned int nr_free_highpages(void); -extern unsigned long totalhigh_pages; +extern atomic_long_t _totalhigh_pages; +static inline unsigned long totalhigh_pages(void) +{ + return (unsigned long)atomic_long_read(&_totalhigh_pages); +} + +static inline void totalhigh_pages_inc(void) +{ + atomic_long_inc(&_totalhigh_pages); +} + +static inline void totalhigh_pages_dec(void) +{ + atomic_long_dec(&_totalhigh_pages); +} + +static inline void totalhigh_pages_add(long count) +{ + atomic_long_add(count, &_totalhigh_pages); +} + +static inline void totalhigh_pages_set(long val) +{ + atomic_long_set(&_totalhigh_pages, val); +} void kmap_flush_unused(void); @@ -51,7 +75,7 @@ static inline struct page *kmap_to_page(void *addr) return virt_to_page(addr); } -#define totalhigh_pages 0UL +static inline unsigned long totalhigh_pages(void) { return 0UL; } #ifndef ARCH_HAS_KMAP static inline void *kmap(struct page *page) diff --git a/include/linux/mm.h b/include/linux/mm.h index b4d01969e700..1d2be4c2d34a 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -48,7 +48,32 @@ static inline void set_max_mapnr(unsigned long limit) static inline void set_max_mapnr(unsigned long limit) { } #endif -extern unsigned long totalram_pages; +extern atomic_long_t _totalram_pages; +static inline unsigned long totalram_pages(void) +{ + return (unsigned long)atomic_long_read(&_totalram_pages); +} + +static inline void totalram_pages_inc(void) +{ + atomic_long_inc(&_totalram_pages); +} + +static inline void totalram_pages_dec(void) +{ + atomic_long_dec(&_totalram_pages); +} + +static inline void totalram_pages_add(long count) +{ + atomic_long_add(count, &_totalram_pages); +} + +static inline void totalram_pages_set(long val) +{ + atomic_long_set(&_totalram_pages, val); +} + extern void * high_memory; extern int page_cluster; diff --git a/include/linux/swap.h b/include/linux/swap.h index a8f6d5d89524..77459d695010 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -310,7 +310,6 @@ void workingset_update_node(struct xa_node *node); } while (0) /* linux/mm/page_alloc.c */ -extern unsigned long totalram_pages; extern unsigned long totalreserve_pages; extern unsigned long nr_free_buffer_pages(void); extern unsigned long nr_free_pagecache_pages(void); diff --git a/kernel/fork.c b/kernel/fork.c index 8617a326e9f5..c979605fe806 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -744,7 +744,7 @@ void __init __weak arch_task_cache_init(void) { } static void set_max_threads(unsigned int max_threads_suggested) { u64 threads; - unsigned long nr_pages = totalram_pages; + unsigned long nr_pages = totalram_pages(); /* * The number of threads shall be limited such that the thread diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c index 7e967ca98d92..d7140447be75 100644 --- a/kernel/kexec_core.c +++ b/kernel/kexec_core.c @@ -152,7 +152,7 @@ int sanity_check_segment_list(struct kimage *image) int i; unsigned long nr_segments = image->nr_segments; unsigned long total_pages = 0; - unsigned long nr_pages = totalram_pages; + unsigned long nr_pages = totalram_pages(); /* * Verify we have good destination addresses. The caller is diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c index b0308a2c6000..640b2034edd6 100644 --- a/kernel/power/snapshot.c +++ b/kernel/power/snapshot.c @@ -105,7 +105,7 @@ unsigned long image_size; void __init hibernate_image_size_init(void) { - image_size = ((totalram_pages * 2) / 5) * PAGE_SIZE; + image_size = ((totalram_pages() * 2) / 5) * PAGE_SIZE; } /* diff --git a/mm/highmem.c b/mm/highmem.c index 59db3223a5d6..107b10f9878e 100644 --- a/mm/highmem.c +++ b/mm/highmem.c @@ -105,9 +105,8 @@ static inline wait_queue_head_t *get_pkmap_wait_queue_head(unsigned int color) } #endif -unsigned long totalhigh_pages __read_mostly; -EXPORT_SYMBOL(totalhigh_pages); - +atomic_long_t _totalhigh_pages __read_mostly; +EXPORT_SYMBOL(_totalhigh_pages); EXPORT_PER_CPU_SYMBOL(__kmap_atomic_idx); diff --git a/mm/huge_memory.c b/mm/huge_memory.c index e84a10b0d310..da6682bb69aa 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -420,7 +420,7 @@ static int __init hugepage_init(void) * where the extra memory used could hurt more than TLB overhead * is likely to save. The admin can still enable it through /sys. */ - if (totalram_pages < (512 << (20 - PAGE_SHIFT))) { + if (totalram_pages() < (512 << (20 - PAGE_SHIFT))) { transparent_hugepage_flags = 0; return 0; } diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c index 57334ef2d7ef..978bc4a3eb51 100644 --- a/mm/kasan/quarantine.c +++ b/mm/kasan/quarantine.c @@ -237,7 +237,7 @@ void quarantine_reduce(void) * Update quarantine size in case of hotplug. Allocate a fraction of * the installed memory to quarantine minus per-cpu queue limits. */ - total_size = (READ_ONCE(totalram_pages) << PAGE_SHIFT) / + total_size = (totalram_pages() << PAGE_SHIFT) / QUARANTINE_FRACTION; percpu_quarantines = QUARANTINE_PERCPU_SIZE * num_online_cpus(); new_quarantine_size = (total_size < percpu_quarantines) ? diff --git a/mm/memblock.c b/mm/memblock.c index 0068f87af1e8..a53d8697612c 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -1576,7 +1576,7 @@ void __init __memblock_free_late(phys_addr_t base, phys_addr_t size) for (; cursor < end; cursor++) { memblock_free_pages(pfn_to_page(cursor), cursor, 0); - totalram_pages++; + totalram_pages_inc(); } } @@ -1978,7 +1978,7 @@ unsigned long __init memblock_free_all(void) reset_all_zones_managed_pages(); pages = free_low_memory_core_early(); - totalram_pages += pages; + totalram_pages_add(pages); return pages; } diff --git a/mm/mm_init.c b/mm/mm_init.c index 6838a530789b..33917105a3a2 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -146,7 +146,7 @@ static void __meminit mm_compute_batch(void) s32 batch = max_t(s32, nr*2, 32); /* batch size set to 0.4% of (total memory/#cpus), or max int32 */ - memsized_batch = min_t(u64, (totalram_pages/nr)/256, 0x7fffffff); + memsized_batch = min_t(u64, (totalram_pages()/nr)/256, 0x7fffffff); vm_committed_as_batch = max_t(s32, memsized_batch, batch); } diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 6589f60d5018..21d487749e1d 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -269,7 +269,7 @@ static enum oom_constraint constrained_alloc(struct oom_control *oc) } /* Default to all available memory */ - oc->totalpages = totalram_pages + total_swap_pages; + oc->totalpages = totalram_pages() + total_swap_pages; if (!IS_ENABLED(CONFIG_NUMA)) return CONSTRAINT_NONE; diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 4b5c4ff68f18..eb2027892ef9 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -16,6 +16,7 @@ #include #include +#include #include #include #include @@ -124,7 +125,8 @@ EXPORT_SYMBOL(node_states); /* Protect totalram_pages and zone->managed_pages */ static DEFINE_SPINLOCK(managed_page_count_lock); -unsigned long totalram_pages __read_mostly; +atomic_long_t _totalram_pages __read_mostly; +EXPORT_SYMBOL(_totalram_pages); unsigned long totalreserve_pages __read_mostly; unsigned long totalcma_pages __read_mostly; @@ -4747,11 +4749,11 @@ EXPORT_SYMBOL_GPL(si_mem_available); void si_meminfo(struct sysinfo *val) { - val->totalram = totalram_pages; + val->totalram = totalram_pages(); val->sharedram = global_node_page_state(NR_SHMEM); val->freeram = global_zone_page_state(NR_FREE_PAGES); val->bufferram = nr_blockdev_pages(); - val->totalhigh = totalhigh_pages; + val->totalhigh = totalhigh_pages(); val->freehigh = nr_free_highpages(); val->mem_unit = PAGE_SIZE; } @@ -7077,10 +7079,10 @@ void adjust_managed_page_count(struct page *page, long count) { spin_lock(&managed_page_count_lock); atomic_long_add(count, &page_zone(page)->managed_pages); - totalram_pages += count; + totalram_pages_add(count); #ifdef CONFIG_HIGHMEM if (PageHighMem(page)) - totalhigh_pages += count; + totalhigh_pages_add(count); #endif spin_unlock(&managed_page_count_lock); } @@ -7123,9 +7125,9 @@ EXPORT_SYMBOL(free_reserved_area); void free_highmem_page(struct page *page) { __free_reserved_page(page); - totalram_pages++; + totalram_pages_inc(); atomic_long_inc(&page_zone(page)->managed_pages); - totalhigh_pages++; + totalhigh_pages_inc(); } #endif @@ -7174,10 +7176,10 @@ void __init mem_init_print_info(const char *str) physpages << (PAGE_SHIFT - 10), codesize >> 10, datasize >> 10, rosize >> 10, (init_data_size + init_code_size) >> 10, bss_size >> 10, - (physpages - totalram_pages - totalcma_pages) << (PAGE_SHIFT - 10), + (physpages - totalram_pages() - totalcma_pages) << (PAGE_SHIFT - 10), totalcma_pages << (PAGE_SHIFT - 10), #ifdef CONFIG_HIGHMEM - totalhigh_pages << (PAGE_SHIFT - 10), + totalhigh_pages() << (PAGE_SHIFT - 10), #endif str ? ", " : "", str ? str : ""); } diff --git a/mm/shmem.c b/mm/shmem.c index b1f0f54470fb..6ece1e2fe76e 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -109,13 +109,14 @@ struct shmem_falloc { #ifdef CONFIG_TMPFS static unsigned long shmem_default_max_blocks(void) { - return totalram_pages / 2; + return totalram_pages() / 2; } static unsigned long shmem_default_max_inodes(void) { - unsigned long nr_pages = totalram_pages; - return min(nr_pages - totalhigh_pages, nr_pages / 2); + unsigned long nr_pages = totalram_pages(); + + return min(nr_pages - totalhigh_pages(), nr_pages / 2); } #endif @@ -3302,7 +3303,7 @@ static int shmem_parse_options(char *options, struct shmem_sb_info *sbinfo, size = memparse(value,&rest); if (*rest == '%') { size <<= PAGE_SHIFT; - size *= totalram_pages; + size *= totalram_pages(); do_div(size, 100); rest++; } diff --git a/mm/slab.c b/mm/slab.c index 01991060714c..73fe23e649c9 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -1235,7 +1235,7 @@ void __init kmem_cache_init(void) * page orders on machines with more than 32MB of memory if * not overridden on the command line. */ - if (!slab_max_order_set && totalram_pages > (32 << 20) >> PAGE_SHIFT) + if (!slab_max_order_set && totalram_pages() > (32 << 20) >> PAGE_SHIFT) slab_max_order = SLAB_MAX_ORDER_HI; /* Bootstrap is tricky, because several objects are allocated diff --git a/mm/swap.c b/mm/swap.c index 5d786019eab9..4d8a1f1afaab 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -1022,7 +1022,7 @@ EXPORT_SYMBOL(pagevec_lookup_range_nr_tag); */ void __init swap_setup(void) { - unsigned long megs = totalram_pages >> (20 - PAGE_SHIFT); + unsigned long megs = totalram_pages() >> (20 - PAGE_SHIFT); /* Use a smaller cluster for small-memory machines */ if (megs < 16) diff --git a/mm/util.c b/mm/util.c index 8bf08b5b5760..4df23d64aac7 100644 --- a/mm/util.c +++ b/mm/util.c @@ -593,7 +593,7 @@ unsigned long vm_commit_limit(void) if (sysctl_overcommit_kbytes) allowed = sysctl_overcommit_kbytes >> (PAGE_SHIFT - 10); else - allowed = ((totalram_pages - hugetlb_total_pages()) + allowed = ((totalram_pages() - hugetlb_total_pages()) * sysctl_overcommit_ratio / 100); allowed += total_swap_pages; diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 97d4b25d0373..871e41c55e23 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -1634,7 +1634,7 @@ void *vmap(struct page **pages, unsigned int count, might_sleep(); - if (count > totalram_pages) + if (count > totalram_pages()) return NULL; size = (unsigned long)count << PAGE_SHIFT; @@ -1739,7 +1739,7 @@ void *__vmalloc_node_range(unsigned long size, unsigned long align, unsigned long real_size = size; size = PAGE_ALIGN(size); - if (!size || (size >> PAGE_SHIFT) > totalram_pages) + if (!size || (size >> PAGE_SHIFT) > totalram_pages()) goto fail; area = __get_vm_area_node(size, align, VM_ALLOC | VM_UNINITIALIZED | diff --git a/mm/workingset.c b/mm/workingset.c index d46f8c92aa2f..dcb994f2acc2 100644 --- a/mm/workingset.c +++ b/mm/workingset.c @@ -549,7 +549,7 @@ static int __init workingset_init(void) * double the initial memory by using totalram_pages as-is. */ timestamp_bits = BITS_PER_LONG - EVICTION_SHIFT; - max_order = fls_long(totalram_pages - 1); + max_order = fls_long(totalram_pages() - 1); if (max_order > timestamp_bits) bucket_order = max_order - timestamp_bits; pr_info("workingset: timestamp_bits=%d max_order=%d bucket_order=%u\n", diff --git a/mm/zswap.c b/mm/zswap.c index cd91fd9d96b8..a4e4d36ec085 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -219,8 +219,8 @@ static const struct zpool_ops zswap_zpool_ops = { static bool zswap_is_full(void) { - return totalram_pages * zswap_max_pool_percent / 100 < - DIV_ROUND_UP(zswap_pool_total_size, PAGE_SIZE); + return totalram_pages() * zswap_max_pool_percent / 100 < + DIV_ROUND_UP(zswap_pool_total_size, PAGE_SIZE); } static void zswap_update_total_size(void) diff --git a/net/dccp/proto.c b/net/dccp/proto.c index ff727ff61b5b..0e2f71ab8367 100644 --- a/net/dccp/proto.c +++ b/net/dccp/proto.c @@ -1131,7 +1131,7 @@ EXPORT_SYMBOL_GPL(dccp_debug); static int __init dccp_init(void) { unsigned long goal; - unsigned long nr_pages = totalram_pages; + unsigned long nr_pages = totalram_pages(); int ehash_order, bhash_order, i; int rc; diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c index 1c002c0fb712..950613ee7881 100644 --- a/net/decnet/dn_route.c +++ b/net/decnet/dn_route.c @@ -1866,7 +1866,7 @@ void __init dn_route_init(void) dn_route_timer.expires = jiffies + decnet_dst_gc_interval * HZ; add_timer(&dn_route_timer); - goal = totalram_pages >> (26 - PAGE_SHIFT); + goal = totalram_pages() >> (26 - PAGE_SHIFT); for(order = 0; (1UL << order) < goal; order++) /* NOTHING */; diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c index 03b51cdcc731..b467a7cabf40 100644 --- a/net/ipv4/tcp_metrics.c +++ b/net/ipv4/tcp_metrics.c @@ -1000,7 +1000,7 @@ static int __net_init tcp_net_metrics_init(struct net *net) slots = tcpmhash_entries; if (!slots) { - if (totalram_pages >= 128 * 1024) + if (totalram_pages() >= 128 * 1024) slots = 16 * 1024; else slots = 8 * 1024; diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index 5eb990830348..741b533148ba 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -2248,7 +2248,7 @@ static __always_inline unsigned int total_extension_size(void) int nf_conntrack_init_start(void) { - unsigned long nr_pages = totalram_pages; + unsigned long nr_pages = totalram_pages(); int max_factor = 8; int ret = -ENOMEM; int i; diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c index 88b520ba2abc..8d86e39d6280 100644 --- a/net/netfilter/xt_hashlimit.c +++ b/net/netfilter/xt_hashlimit.c @@ -274,7 +274,7 @@ static int htable_create(struct net *net, struct hashlimit_cfg3 *cfg, struct xt_hashlimit_htable *hinfo; const struct seq_operations *ops; unsigned int size, i; - unsigned long nr_pages = totalram_pages; + unsigned long nr_pages = totalram_pages(); int ret; if (cfg->size) { diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c index a5b24182b3cc..d5878ae55840 100644 --- a/net/sctp/protocol.c +++ b/net/sctp/protocol.c @@ -1368,7 +1368,7 @@ static __init int sctp_init(void) int status = -EINVAL; unsigned long goal; unsigned long limit; - unsigned long nr_pages = totalram_pages; + unsigned long nr_pages = totalram_pages(); int max_share; int order; int num_entries; diff --git a/security/integrity/ima/ima_kexec.c b/security/integrity/ima/ima_kexec.c index 16bd18747cfa..d6f32807b347 100644 --- a/security/integrity/ima/ima_kexec.c +++ b/security/integrity/ima/ima_kexec.c @@ -106,7 +106,7 @@ void ima_add_kexec_buffer(struct kimage *image) kexec_segment_size = ALIGN(ima_get_binary_runtime_size() + PAGE_SIZE / 2, PAGE_SIZE); if ((kexec_segment_size == ULONG_MAX) || - ((kexec_segment_size >> PAGE_SHIFT) > totalram_pages / 2)) { + ((kexec_segment_size >> PAGE_SHIFT) > totalram_pages() / 2)) { pr_err("Binary measurement list too large.\n"); return; } -- cgit v1.2.3-59-g8ed1b From 808153e1187fa77ac7d7dad261ff476888dcf398 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Fri, 28 Dec 2018 00:34:50 -0800 Subject: mm, devm_memremap_pages: mark devm_memremap_pages() EXPORT_SYMBOL_GPL MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit devm_memremap_pages() is a facility that can create struct page entries for any arbitrary range and give drivers the ability to subvert core aspects of page management. Specifically the facility is tightly integrated with the kernel's memory hotplug functionality. It injects an altmap argument deep into the architecture specific vmemmap implementation to allow allocating from specific reserved pages, and it has Linux specific assumptions about page structure reference counting relative to get_user_pages() and get_user_pages_fast(). It was an oversight and a mistake that this was not marked EXPORT_SYMBOL_GPL from the outset. Again, devm_memremap_pagex() exposes and relies upon core kernel internal assumptions and will continue to evolve along with 'struct page', memory hotplug, and support for new memory types / topologies. Only an in-kernel GPL-only driver is expected to keep up with this ongoing evolution. This interface, and functionality derived from this interface, is not suitable for kernel-external drivers. Link: http://lkml.kernel.org/r/154275557457.76910.16923571232582744134.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams Reviewed-by: Christoph Hellwig Acked-by: Michal Hocko Cc: "Jérôme Glisse" Cc: Balbir Singh Cc: Logan Gunthorpe Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/memremap.c | 2 +- tools/testing/nvdimm/test/iomap.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) (limited to 'kernel') diff --git a/kernel/memremap.c b/kernel/memremap.c index 9eced2cc9f94..61dbcaa95530 100644 --- a/kernel/memremap.c +++ b/kernel/memremap.c @@ -233,7 +233,7 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) err_array: return ERR_PTR(error); } -EXPORT_SYMBOL(devm_memremap_pages); +EXPORT_SYMBOL_GPL(devm_memremap_pages); unsigned long vmem_altmap_offset(struct vmem_altmap *altmap) { diff --git a/tools/testing/nvdimm/test/iomap.c b/tools/testing/nvdimm/test/iomap.c index ff9d3a5825e1..ed18a0cbc0c8 100644 --- a/tools/testing/nvdimm/test/iomap.c +++ b/tools/testing/nvdimm/test/iomap.c @@ -113,7 +113,7 @@ void *__wrap_devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) return nfit_res->buf + offset - nfit_res->res.start; return devm_memremap_pages(dev, pgmap); } -EXPORT_SYMBOL(__wrap_devm_memremap_pages); +EXPORT_SYMBOL_GPL(__wrap_devm_memremap_pages); pfn_t __wrap_phys_to_pfn_t(phys_addr_t addr, unsigned long flags) { -- cgit v1.2.3-59-g8ed1b From 06489cfbd915ff36c8e36df27f1c2dc60f97ca56 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Fri, 28 Dec 2018 00:34:54 -0800 Subject: mm, devm_memremap_pages: kill mapping "System RAM" support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Given the fact that devm_memremap_pages() requires a percpu_ref that is torn down by devm_memremap_pages_release() the current support for mapping RAM is broken. Support for remapping "System RAM" has been broken since the beginning and there is no existing user of this this code path, so just kill the support and make it an explicit error. This cleanup also simplifies a follow-on patch to fix the error path when setting a devm release action for devm_memremap_pages_release() fails. Link: http://lkml.kernel.org/r/154275557997.76910.14689813630968180480.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams Reviewed-by: "Jérôme Glisse" Reviewed-by: Christoph Hellwig Reviewed-by: Logan Gunthorpe Cc: Balbir Singh Cc: Michal Hocko Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/memremap.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) (limited to 'kernel') diff --git a/kernel/memremap.c b/kernel/memremap.c index 61dbcaa95530..99d14940acfa 100644 --- a/kernel/memremap.c +++ b/kernel/memremap.c @@ -167,15 +167,12 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) is_ram = region_intersects(align_start, align_size, IORESOURCE_SYSTEM_RAM, IORES_DESC_NONE); - if (is_ram == REGION_MIXED) { - WARN_ONCE(1, "%s attempted on mixed region %pr\n", - __func__, res); + if (is_ram != REGION_DISJOINT) { + WARN_ONCE(1, "%s attempted on %s region %pr\n", __func__, + is_ram == REGION_MIXED ? "mixed" : "ram", res); return ERR_PTR(-ENXIO); } - if (is_ram == REGION_INTERSECTS) - return __va(res->start); - if (!pgmap->ref) return ERR_PTR(-EINVAL); -- cgit v1.2.3-59-g8ed1b From a95c90f1e2c253b280385ecf3d4ebfe476926b28 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Fri, 28 Dec 2018 00:34:57 -0800 Subject: mm, devm_memremap_pages: fix shutdown handling MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The last step before devm_memremap_pages() returns success is to allocate a release action, devm_memremap_pages_release(), to tear the entire setup down. However, the result from devm_add_action() is not checked. Checking the error from devm_add_action() is not enough. The api currently relies on the fact that the percpu_ref it is using is killed by the time the devm_memremap_pages_release() is run. Rather than continue this awkward situation, offload the responsibility of killing the percpu_ref to devm_memremap_pages_release() directly. This allows devm_memremap_pages() to do the right thing relative to init failures and shutdown. Without this change we could fail to register the teardown of devm_memremap_pages(). The likelihood of hitting this failure is tiny as small memory allocations almost always succeed. However, the impact of the failure is large given any future reconfiguration, or disable/enable, of an nvdimm namespace will fail forever as subsequent calls to devm_memremap_pages() will fail to setup the pgmap_radix since there will be stale entries for the physical address range. An argument could be made to require that the ->kill() operation be set in the @pgmap arg rather than passed in separately. However, it helps code readability, tracking the lifetime of a given instance, to be able to grep the kill routine directly at the devm_memremap_pages() call site. Link: http://lkml.kernel.org/r/154275558526.76910.7535251937849268605.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams Fixes: e8d513483300 ("memremap: change devm_memremap_pages interface...") Reviewed-by: "Jérôme Glisse" Reported-by: Logan Gunthorpe Reviewed-by: Logan Gunthorpe Reviewed-by: Christoph Hellwig Cc: Balbir Singh Cc: Michal Hocko Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/dax/pmem.c | 14 +++----------- drivers/nvdimm/pmem.c | 13 +++++-------- include/linux/memremap.h | 2 ++ kernel/memremap.c | 30 ++++++++++++++---------------- tools/testing/nvdimm/test/iomap.c | 15 ++++++++++++++- 5 files changed, 38 insertions(+), 36 deletions(-) (limited to 'kernel') diff --git a/drivers/dax/pmem.c b/drivers/dax/pmem.c index 99e2aace8078..2c1f459c0c63 100644 --- a/drivers/dax/pmem.c +++ b/drivers/dax/pmem.c @@ -48,9 +48,8 @@ static void dax_pmem_percpu_exit(void *data) percpu_ref_exit(ref); } -static void dax_pmem_percpu_kill(void *data) +static void dax_pmem_percpu_kill(struct percpu_ref *ref) { - struct percpu_ref *ref = data; struct dax_pmem *dax_pmem = to_dax_pmem(ref); dev_dbg(dax_pmem->dev, "trace\n"); @@ -112,17 +111,10 @@ static int dax_pmem_probe(struct device *dev) } dax_pmem->pgmap.ref = &dax_pmem->ref; + dax_pmem->pgmap.kill = dax_pmem_percpu_kill; addr = devm_memremap_pages(dev, &dax_pmem->pgmap); - if (IS_ERR(addr)) { - devm_remove_action(dev, dax_pmem_percpu_exit, &dax_pmem->ref); - percpu_ref_exit(&dax_pmem->ref); + if (IS_ERR(addr)) return PTR_ERR(addr); - } - - rc = devm_add_action_or_reset(dev, dax_pmem_percpu_kill, - &dax_pmem->ref); - if (rc) - return rc; /* adjust the dax_region resource to the start of data */ memcpy(&res, &dax_pmem->pgmap.res, sizeof(res)); diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c index 0e39e3d1846f..d28418b05a04 100644 --- a/drivers/nvdimm/pmem.c +++ b/drivers/nvdimm/pmem.c @@ -309,8 +309,11 @@ static void pmem_release_queue(void *q) blk_cleanup_queue(q); } -static void pmem_freeze_queue(void *q) +static void pmem_freeze_queue(struct percpu_ref *ref) { + struct request_queue *q; + + q = container_of(ref, typeof(*q), q_usage_counter); blk_freeze_queue_start(q); } @@ -402,6 +405,7 @@ static int pmem_attach_disk(struct device *dev, pmem->pfn_flags = PFN_DEV; pmem->pgmap.ref = &q->q_usage_counter; + pmem->pgmap.kill = pmem_freeze_queue; if (is_nd_pfn(dev)) { if (setup_pagemap_fsdax(dev, &pmem->pgmap)) return -ENOMEM; @@ -427,13 +431,6 @@ static int pmem_attach_disk(struct device *dev, memcpy(&bb_res, &nsio->res, sizeof(bb_res)); } - /* - * At release time the queue must be frozen before - * devm_memremap_pages is unwound - */ - if (devm_add_action_or_reset(dev, pmem_freeze_queue, q)) - return -ENOMEM; - if (IS_ERR(addr)) return PTR_ERR(addr); pmem->virt_addr = addr; diff --git a/include/linux/memremap.h b/include/linux/memremap.h index 0ac69ddf5fc4..55db66b3716f 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -111,6 +111,7 @@ typedef void (*dev_page_free_t)(struct page *page, void *data); * @altmap: pre-allocated/reserved memory for vmemmap allocations * @res: physical address range covered by @ref * @ref: reference count that pins the devm_memremap_pages() mapping + * @kill: callback to transition @ref to the dead state * @dev: host device of the mapping for debug * @data: private data pointer for page_free() * @type: memory type: see MEMORY_* in memory_hotplug.h @@ -122,6 +123,7 @@ struct dev_pagemap { bool altmap_valid; struct resource res; struct percpu_ref *ref; + void (*kill)(struct percpu_ref *ref); struct device *dev; void *data; enum memory_type type; diff --git a/kernel/memremap.c b/kernel/memremap.c index 99d14940acfa..5e45f0c327a5 100644 --- a/kernel/memremap.c +++ b/kernel/memremap.c @@ -88,14 +88,10 @@ static void devm_memremap_pages_release(void *data) resource_size_t align_start, align_size; unsigned long pfn; + pgmap->kill(pgmap->ref); for_each_device_pfn(pfn, pgmap) put_page(pfn_to_page(pfn)); - if (percpu_ref_tryget_live(pgmap->ref)) { - dev_WARN(dev, "%s: page mapping is still live!\n", __func__); - percpu_ref_put(pgmap->ref); - } - /* pages are dead and unused, undo the arch mapping */ align_start = res->start & ~(SECTION_SIZE - 1); align_size = ALIGN(res->start + resource_size(res), SECTION_SIZE) @@ -116,7 +112,7 @@ static void devm_memremap_pages_release(void *data) /** * devm_memremap_pages - remap and provide memmap backing for the given resource * @dev: hosting device for @res - * @pgmap: pointer to a struct dev_pgmap + * @pgmap: pointer to a struct dev_pagemap * * Notes: * 1/ At a minimum the res, ref and type members of @pgmap must be initialized @@ -125,11 +121,8 @@ static void devm_memremap_pages_release(void *data) * 2/ The altmap field may optionally be initialized, in which case altmap_valid * must be set to true * - * 3/ pgmap.ref must be 'live' on entry and 'dead' before devm_memunmap_pages() - * time (or devm release event). The expected order of events is that ref has - * been through percpu_ref_kill() before devm_memremap_pages_release(). The - * wait for the completion of all references being dropped and - * percpu_ref_exit() must occur after devm_memremap_pages_release(). + * 3/ pgmap->ref must be 'live' on entry and will be killed at + * devm_memremap_pages_release() time, or if this routine fails. * * 4/ res is expected to be a host memory range that could feasibly be * treated as a "System RAM" range, i.e. not a device mmio range, but @@ -145,6 +138,9 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) pgprot_t pgprot = PAGE_KERNEL; int error, nid, is_ram; + if (!pgmap->ref || !pgmap->kill) + return ERR_PTR(-EINVAL); + align_start = res->start & ~(SECTION_SIZE - 1); align_size = ALIGN(res->start + resource_size(res), SECTION_SIZE) - align_start; @@ -170,12 +166,10 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) if (is_ram != REGION_DISJOINT) { WARN_ONCE(1, "%s attempted on %s region %pr\n", __func__, is_ram == REGION_MIXED ? "mixed" : "ram", res); - return ERR_PTR(-ENXIO); + error = -ENXIO; + goto err_array; } - if (!pgmap->ref) - return ERR_PTR(-EINVAL); - pgmap->dev = dev; error = xa_err(xa_store_range(&pgmap_array, PHYS_PFN(res->start), @@ -217,7 +211,10 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) align_size >> PAGE_SHIFT, pgmap); percpu_ref_get_many(pgmap->ref, pfn_end(pgmap) - pfn_first(pgmap)); - devm_add_action(dev, devm_memremap_pages_release, pgmap); + error = devm_add_action_or_reset(dev, devm_memremap_pages_release, + pgmap); + if (error) + return ERR_PTR(error); return __va(res->start); @@ -228,6 +225,7 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) err_pfn_remap: pgmap_array_delete(res); err_array: + pgmap->kill(pgmap->ref); return ERR_PTR(error); } EXPORT_SYMBOL_GPL(devm_memremap_pages); diff --git a/tools/testing/nvdimm/test/iomap.c b/tools/testing/nvdimm/test/iomap.c index ed18a0cbc0c8..c6635fee27d8 100644 --- a/tools/testing/nvdimm/test/iomap.c +++ b/tools/testing/nvdimm/test/iomap.c @@ -104,13 +104,26 @@ void *__wrap_devm_memremap(struct device *dev, resource_size_t offset, } EXPORT_SYMBOL(__wrap_devm_memremap); +static void nfit_test_kill(void *_pgmap) +{ + struct dev_pagemap *pgmap = _pgmap; + + pgmap->kill(pgmap->ref); +} + void *__wrap_devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) { resource_size_t offset = pgmap->res.start; struct nfit_test_resource *nfit_res = get_nfit_res(offset); - if (nfit_res) + if (nfit_res) { + int rc; + + rc = devm_add_action_or_reset(dev, nfit_test_kill, pgmap); + if (rc) + return ERR_PTR(rc); return nfit_res->buf + offset - nfit_res->res.start; + } return devm_memremap_pages(dev, pgmap); } EXPORT_SYMBOL_GPL(__wrap_devm_memremap_pages); -- cgit v1.2.3-59-g8ed1b From 69324b8f48339de2f90fdf2f774687fc6c47629a Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Fri, 28 Dec 2018 00:35:01 -0800 Subject: mm, devm_memremap_pages: add MEMORY_DEVICE_PRIVATE support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In preparation for consolidating all ZONE_DEVICE enabling via devm_memremap_pages(), teach it how to handle the constraints of MEMORY_DEVICE_PRIVATE ranges. [jglisse@redhat.com: call move_pfn_range_to_zone for MEMORY_DEVICE_PRIVATE] Link: http://lkml.kernel.org/r/154275559036.76910.12434636179931292607.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams Reviewed-by: Jérôme Glisse Acked-by: Christoph Hellwig Reported-by: Logan Gunthorpe Reviewed-by: Logan Gunthorpe Cc: Balbir Singh Cc: Michal Hocko Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/memremap.c | 53 +++++++++++++++++++++++++++++++++++++++++------------ 1 file changed, 41 insertions(+), 12 deletions(-) (limited to 'kernel') diff --git a/kernel/memremap.c b/kernel/memremap.c index 5e45f0c327a5..3eef989ef035 100644 --- a/kernel/memremap.c +++ b/kernel/memremap.c @@ -98,9 +98,15 @@ static void devm_memremap_pages_release(void *data) - align_start; mem_hotplug_begin(); - arch_remove_memory(align_start, align_size, pgmap->altmap_valid ? - &pgmap->altmap : NULL); - kasan_remove_zero_shadow(__va(align_start), align_size); + if (pgmap->type == MEMORY_DEVICE_PRIVATE) { + pfn = align_start >> PAGE_SHIFT; + __remove_pages(page_zone(pfn_to_page(pfn)), pfn, + align_size >> PAGE_SHIFT, NULL); + } else { + arch_remove_memory(align_start, align_size, + pgmap->altmap_valid ? &pgmap->altmap : NULL); + kasan_remove_zero_shadow(__va(align_start), align_size); + } mem_hotplug_done(); untrack_pfn(NULL, PHYS_PFN(align_start), align_size); @@ -187,17 +193,40 @@ void *devm_memremap_pages(struct device *dev, struct dev_pagemap *pgmap) goto err_pfn_remap; mem_hotplug_begin(); - error = kasan_add_zero_shadow(__va(align_start), align_size); - if (error) { - mem_hotplug_done(); - goto err_kasan; + + /* + * For device private memory we call add_pages() as we only need to + * allocate and initialize struct page for the device memory. More- + * over the device memory is un-accessible thus we do not want to + * create a linear mapping for the memory like arch_add_memory() + * would do. + * + * For all other device memory types, which are accessible by + * the CPU, we do want the linear mapping and thus use + * arch_add_memory(). + */ + if (pgmap->type == MEMORY_DEVICE_PRIVATE) { + error = add_pages(nid, align_start >> PAGE_SHIFT, + align_size >> PAGE_SHIFT, NULL, false); + } else { + error = kasan_add_zero_shadow(__va(align_start), align_size); + if (error) { + mem_hotplug_done(); + goto err_kasan; + } + + error = arch_add_memory(nid, align_start, align_size, altmap, + false); + } + + if (!error) { + struct zone *zone; + + zone = &NODE_DATA(nid)->node_zones[ZONE_DEVICE]; + move_pfn_range_to_zone(zone, align_start >> PAGE_SHIFT, + align_size >> PAGE_SHIFT, altmap); } - error = arch_add_memory(nid, align_start, align_size, altmap, false); - if (!error) - move_pfn_range_to_zone(&NODE_DATA(nid)->node_zones[ZONE_DEVICE], - align_start >> PAGE_SHIFT, - align_size >> PAGE_SHIFT, altmap); mem_hotplug_done(); if (error) goto err_add_memory; -- cgit v1.2.3-59-g8ed1b From 1c30844d2dfe272d58c8fc000960b835d13aa2ac Mon Sep 17 00:00:00 2001 From: Mel Gorman Date: Fri, 28 Dec 2018 00:35:52 -0800 Subject: mm: reclaim small amounts of memory when an external fragmentation event occurs An external fragmentation event was previously described as When the page allocator fragments memory, it records the event using the mm_page_alloc_extfrag event. If the fallback_order is smaller than a pageblock order (order-9 on 64-bit x86) then it's considered an event that will cause external fragmentation issues in the future. The kernel reduces the probability of such events by increasing the watermark sizes by calling set_recommended_min_free_kbytes early in the lifetime of the system. This works reasonably well in general but if there are enough sparsely populated pageblocks then the problem can still occur as enough memory is free overall and kswapd stays asleep. This patch introduces a watermark_boost_factor sysctl that allows a zone watermark to be temporarily boosted when an external fragmentation causing events occurs. The boosting will stall allocations that would decrease free memory below the boosted low watermark and kswapd is woken if the calling context allows to reclaim an amount of memory relative to the size of the high watermark and the watermark_boost_factor until the boost is cleared. When kswapd finishes, it wakes kcompactd at the pageblock order to clean some of the pageblocks that may have been affected by the fragmentation event. kswapd avoids any writeback, slab shrinkage and swap from reclaim context during this operation to avoid excessive system disruption in the name of fragmentation avoidance. Care is taken so that kswapd will do normal reclaim work if the system is really low on memory. This was evaluated using the same workloads as "mm, page_alloc: Spread allocations across zones before introducing fragmentation". 1-socket Skylake machine config-global-dhp__workload_thpfioscale XFS (no special madvise) 4 fio threads, 1 THP allocating thread -------------------------------------- 4.20-rc3 extfrag events < order 9: 804694 4.20-rc3+patch: 408912 (49% reduction) 4.20-rc3+patch1-4: 18421 (98% reduction) 4.20.0-rc3 4.20.0-rc3 lowzone-v5r8 boost-v5r8 Amean fault-base-1 653.58 ( 0.00%) 652.71 ( 0.13%) Amean fault-huge-1 0.00 ( 0.00%) 178.93 * -99.00%* 4.20.0-rc3 4.20.0-rc3 lowzone-v5r8 boost-v5r8 Percentage huge-1 0.00 ( 0.00%) 5.12 ( 100.00%) Note that external fragmentation causing events are massively reduced by this path whether in comparison to the previous kernel or the vanilla kernel. The fault latency for huge pages appears to be increased but that is only because THP allocations were successful with the patch applied. 1-socket Skylake machine global-dhp__workload_thpfioscale-madvhugepage-xfs (MADV_HUGEPAGE) ----------------------------------------------------------------- 4.20-rc3 extfrag events < order 9: 291392 4.20-rc3+patch: 191187 (34% reduction) 4.20-rc3+patch1-4: 13464 (95% reduction) thpfioscale Fault Latencies 4.20.0-rc3 4.20.0-rc3 lowzone-v5r8 boost-v5r8 Min fault-base-1 912.00 ( 0.00%) 905.00 ( 0.77%) Min fault-huge-1 127.00 ( 0.00%) 135.00 ( -6.30%) Amean fault-base-1 1467.55 ( 0.00%) 1481.67 ( -0.96%) Amean fault-huge-1 1127.11 ( 0.00%) 1063.88 * 5.61%* 4.20.0-rc3 4.20.0-rc3 lowzone-v5r8 boost-v5r8 Percentage huge-1 77.64 ( 0.00%) 83.46 ( 7.49%) As before, massive reduction in external fragmentation events, some jitter on latencies and an increase in THP allocation success rates. 2-socket Haswell machine config-global-dhp__workload_thpfioscale XFS (no special madvise) 4 fio threads, 5 THP allocating threads ---------------------------------------------------------------- 4.20-rc3 extfrag events < order 9: 215698 4.20-rc3+patch: 200210 (7% reduction) 4.20-rc3+patch1-4: 14263 (93% reduction) 4.20.0-rc3 4.20.0-rc3 lowzone-v5r8 boost-v5r8 Amean fault-base-5 1346.45 ( 0.00%) 1306.87 ( 2.94%) Amean fault-huge-5 3418.60 ( 0.00%) 1348.94 ( 60.54%) 4.20.0-rc3 4.20.0-rc3 lowzone-v5r8 boost-v5r8 Percentage huge-5 0.78 ( 0.00%) 7.91 ( 910.64%) There is a 93% reduction in fragmentation causing events, there is a big reduction in the huge page fault latency and allocation success rate is higher. 2-socket Haswell machine global-dhp__workload_thpfioscale-madvhugepage-xfs (MADV_HUGEPAGE) ----------------------------------------------------------------- 4.20-rc3 extfrag events < order 9: 166352 4.20-rc3+patch: 147463 (11% reduction) 4.20-rc3+patch1-4: 11095 (93% reduction) thpfioscale Fault Latencies 4.20.0-rc3 4.20.0-rc3 lowzone-v5r8 boost-v5r8 Amean fault-base-5 6217.43 ( 0.00%) 7419.67 * -19.34%* Amean fault-huge-5 3163.33 ( 0.00%) 3263.80 ( -3.18%) 4.20.0-rc3 4.20.0-rc3 lowzone-v5r8 boost-v5r8 Percentage huge-5 95.14 ( 0.00%) 87.98 ( -7.53%) There is a large reduction in fragmentation events with some jitter around the latencies and success rates. As before, the high THP allocation success rate does mean the system is under a lot of pressure. However, as the fragmentation events are reduced, it would be expected that the long-term allocation success rate would be higher. Link: http://lkml.kernel.org/r/20181123114528.28802-5-mgorman@techsingularity.net Signed-off-by: Mel Gorman Acked-by: Vlastimil Babka Cc: Andrea Arcangeli Cc: David Rientjes Cc: Michal Hocko Cc: Zi Yan Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/sysctl/vm.txt | 21 +++++++ include/linux/mm.h | 1 + include/linux/mmzone.h | 11 ++-- kernel/sysctl.c | 8 +++ mm/page_alloc.c | 43 +++++++++++++- mm/vmscan.c | 133 +++++++++++++++++++++++++++++++++++++++++--- 6 files changed, 202 insertions(+), 15 deletions(-) (limited to 'kernel') diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt index 7d73882e2c27..187ce4f599a2 100644 --- a/Documentation/sysctl/vm.txt +++ b/Documentation/sysctl/vm.txt @@ -63,6 +63,7 @@ Currently, these files are in /proc/sys/vm: - swappiness - user_reserve_kbytes - vfs_cache_pressure +- watermark_boost_factor - watermark_scale_factor - zone_reclaim_mode @@ -856,6 +857,26 @@ ten times more freeable objects than there are. ============================================================= +watermark_boost_factor: + +This factor controls the level of reclaim when memory is being fragmented. +It defines the percentage of the high watermark of a zone that will be +reclaimed if pages of different mobility are being mixed within pageblocks. +The intent is that compaction has less work to do in the future and to +increase the success rate of future high-order allocations such as SLUB +allocations, THP and hugetlbfs pages. + +To make it sensible with respect to the watermark_scale_factor parameter, +the unit is in fractions of 10,000. The default value of 15,000 means +that up to 150% of the high watermark will be reclaimed in the event of +a pageblock being mixed due to fragmentation. The level of reclaim is +determined by the number of fragmentation events that occurred in the +recent past. If this value is smaller than a pageblock then a pageblocks +worth of pages will be reclaimed (e.g. 2MB on 64-bit x86). A boost factor +of 0 will disable the feature. + +============================================================= + watermark_scale_factor: This factor controls the aggressiveness of kswapd. It defines the diff --git a/include/linux/mm.h b/include/linux/mm.h index 1d2be4c2d34a..031b2ce983f9 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2256,6 +2256,7 @@ extern void zone_pcp_reset(struct zone *zone); /* page_alloc.c */ extern int min_free_kbytes; +extern int watermark_boost_factor; extern int watermark_scale_factor; /* nommu.c */ diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index dcf1b66a96ab..5b4bfb90fb94 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -269,10 +269,10 @@ enum zone_watermarks { NR_WMARK }; -#define min_wmark_pages(z) (z->_watermark[WMARK_MIN]) -#define low_wmark_pages(z) (z->_watermark[WMARK_LOW]) -#define high_wmark_pages(z) (z->_watermark[WMARK_HIGH]) -#define wmark_pages(z, i) (z->_watermark[i]) +#define min_wmark_pages(z) (z->_watermark[WMARK_MIN] + z->watermark_boost) +#define low_wmark_pages(z) (z->_watermark[WMARK_LOW] + z->watermark_boost) +#define high_wmark_pages(z) (z->_watermark[WMARK_HIGH] + z->watermark_boost) +#define wmark_pages(z, i) (z->_watermark[i] + z->watermark_boost) struct per_cpu_pages { int count; /* number of pages in the list */ @@ -364,6 +364,7 @@ struct zone { /* zone watermarks, access with *_wmark_pages(zone) macros */ unsigned long _watermark[NR_WMARK]; + unsigned long watermark_boost; unsigned long nr_reserved_highatomic; @@ -890,6 +891,8 @@ static inline int is_highmem(struct zone *zone) struct ctl_table; int min_free_kbytes_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); +int watermark_boost_factor_sysctl_handler(struct ctl_table *, int, + void __user *, size_t *, loff_t *); int watermark_scale_factor_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *); extern int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES]; diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 5fc724e4e454..1825f712e73b 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -1462,6 +1462,14 @@ static struct ctl_table vm_table[] = { .proc_handler = min_free_kbytes_sysctl_handler, .extra1 = &zero, }, + { + .procname = "watermark_boost_factor", + .data = &watermark_boost_factor, + .maxlen = sizeof(watermark_boost_factor), + .mode = 0644, + .proc_handler = watermark_boost_factor_sysctl_handler, + .extra1 = &zero, + }, { .procname = "watermark_scale_factor", .data = &watermark_scale_factor, diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 32b3e121a388..80373eca453d 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -262,6 +262,7 @@ compound_page_dtor * const compound_page_dtors[] = { int min_free_kbytes = 1024; int user_min_free_kbytes = -1; +int watermark_boost_factor __read_mostly = 15000; int watermark_scale_factor = 10; static unsigned long nr_kernel_pages __meminitdata; @@ -2129,6 +2130,21 @@ static bool can_steal_fallback(unsigned int order, int start_mt) return false; } +static inline void boost_watermark(struct zone *zone) +{ + unsigned long max_boost; + + if (!watermark_boost_factor) + return; + + max_boost = mult_frac(zone->_watermark[WMARK_HIGH], + watermark_boost_factor, 10000); + max_boost = max(pageblock_nr_pages, max_boost); + + zone->watermark_boost = min(zone->watermark_boost + pageblock_nr_pages, + max_boost); +} + /* * This function implements actual steal behaviour. If order is large enough, * we can steal whole pageblock. If not, we first move freepages in this @@ -2138,7 +2154,7 @@ static bool can_steal_fallback(unsigned int order, int start_mt) * itself, so pages freed in the future will be put on the correct free list. */ static void steal_suitable_fallback(struct zone *zone, struct page *page, - int start_type, bool whole_block) + unsigned int alloc_flags, int start_type, bool whole_block) { unsigned int current_order = page_order(page); struct free_area *area; @@ -2160,6 +2176,15 @@ static void steal_suitable_fallback(struct zone *zone, struct page *page, goto single_page; } + /* + * Boost watermarks to increase reclaim pressure to reduce the + * likelihood of future fallbacks. Wake kswapd now as the node + * may be balanced overall and kswapd will not wake naturally. + */ + boost_watermark(zone); + if (alloc_flags & ALLOC_KSWAPD) + wakeup_kswapd(zone, 0, 0, zone_idx(zone)); + /* We are not allowed to try stealing from the whole block */ if (!whole_block) goto single_page; @@ -2443,7 +2468,8 @@ do_steal: page = list_first_entry(&area->free_list[fallback_mt], struct page, lru); - steal_suitable_fallback(zone, page, start_migratetype, can_steal); + steal_suitable_fallback(zone, page, alloc_flags, start_migratetype, + can_steal); trace_mm_page_alloc_extfrag(page, order, current_order, start_migratetype, fallback_mt); @@ -7454,6 +7480,7 @@ static void __setup_per_zone_wmarks(void) zone->_watermark[WMARK_LOW] = min_wmark_pages(zone) + tmp; zone->_watermark[WMARK_HIGH] = min_wmark_pages(zone) + tmp * 2; + zone->watermark_boost = 0; spin_unlock_irqrestore(&zone->lock, flags); } @@ -7554,6 +7581,18 @@ int min_free_kbytes_sysctl_handler(struct ctl_table *table, int write, return 0; } +int watermark_boost_factor_sysctl_handler(struct ctl_table *table, int write, + void __user *buffer, size_t *length, loff_t *ppos) +{ + int rc; + + rc = proc_dointvec_minmax(table, write, buffer, length, ppos); + if (rc) + return rc; + + return 0; +} + int watermark_scale_factor_sysctl_handler(struct ctl_table *table, int write, void __user *buffer, size_t *length, loff_t *ppos) { diff --git a/mm/vmscan.c b/mm/vmscan.c index 24ab1f7394ab..bd8971a29204 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -88,6 +88,9 @@ struct scan_control { /* Can pages be swapped as part of reclaim? */ unsigned int may_swap:1; + /* e.g. boosted watermark reclaim leaves slabs alone */ + unsigned int may_shrinkslab:1; + /* * Cgroups are not reclaimed below their configured memory.low, * unless we threaten to OOM. If any cgroups are skipped due to @@ -2756,8 +2759,10 @@ static bool shrink_node(pg_data_t *pgdat, struct scan_control *sc) shrink_node_memcg(pgdat, memcg, sc, &lru_pages); node_lru_pages += lru_pages; - shrink_slab(sc->gfp_mask, pgdat->node_id, + if (sc->may_shrinkslab) { + shrink_slab(sc->gfp_mask, pgdat->node_id, memcg, sc->priority); + } /* Record the group's reclaim efficiency */ vmpressure(sc->gfp_mask, memcg, false, @@ -3239,6 +3244,7 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order, .may_writepage = !laptop_mode, .may_unmap = 1, .may_swap = 1, + .may_shrinkslab = 1, }; /* @@ -3283,6 +3289,7 @@ unsigned long mem_cgroup_shrink_node(struct mem_cgroup *memcg, .may_unmap = 1, .reclaim_idx = MAX_NR_ZONES - 1, .may_swap = !noswap, + .may_shrinkslab = 1, }; unsigned long lru_pages; @@ -3329,6 +3336,7 @@ unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg, .may_writepage = !laptop_mode, .may_unmap = 1, .may_swap = may_swap, + .may_shrinkslab = 1, }; /* @@ -3379,6 +3387,30 @@ static void age_active_anon(struct pglist_data *pgdat, } while (memcg); } +static bool pgdat_watermark_boosted(pg_data_t *pgdat, int classzone_idx) +{ + int i; + struct zone *zone; + + /* + * Check for watermark boosts top-down as the higher zones + * are more likely to be boosted. Both watermarks and boosts + * should not be checked at the time time as reclaim would + * start prematurely when there is no boosting and a lower + * zone is balanced. + */ + for (i = classzone_idx; i >= 0; i--) { + zone = pgdat->node_zones + i; + if (!managed_zone(zone)) + continue; + + if (zone->watermark_boost) + return true; + } + + return false; +} + /* * Returns true if there is an eligible zone balanced for the request order * and classzone_idx @@ -3389,6 +3421,10 @@ static bool pgdat_balanced(pg_data_t *pgdat, int order, int classzone_idx) unsigned long mark = -1; struct zone *zone; + /* + * Check watermarks bottom-up as lower zones are more likely to + * meet watermarks. + */ for (i = 0; i <= classzone_idx; i++) { zone = pgdat->node_zones + i; @@ -3517,14 +3553,14 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) unsigned long nr_soft_reclaimed; unsigned long nr_soft_scanned; unsigned long pflags; + unsigned long nr_boost_reclaim; + unsigned long zone_boosts[MAX_NR_ZONES] = { 0, }; + bool boosted; struct zone *zone; struct scan_control sc = { .gfp_mask = GFP_KERNEL, .order = order, - .priority = DEF_PRIORITY, - .may_writepage = !laptop_mode, .may_unmap = 1, - .may_swap = 1, }; psi_memstall_enter(&pflags); @@ -3532,9 +3568,28 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) count_vm_event(PAGEOUTRUN); + /* + * Account for the reclaim boost. Note that the zone boost is left in + * place so that parallel allocations that are near the watermark will + * stall or direct reclaim until kswapd is finished. + */ + nr_boost_reclaim = 0; + for (i = 0; i <= classzone_idx; i++) { + zone = pgdat->node_zones + i; + if (!managed_zone(zone)) + continue; + + nr_boost_reclaim += zone->watermark_boost; + zone_boosts[i] = zone->watermark_boost; + } + boosted = nr_boost_reclaim; + +restart: + sc.priority = DEF_PRIORITY; do { unsigned long nr_reclaimed = sc.nr_reclaimed; bool raise_priority = true; + bool balanced; bool ret; sc.reclaim_idx = classzone_idx; @@ -3561,13 +3616,40 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) } /* - * Only reclaim if there are no eligible zones. Note that - * sc.reclaim_idx is not used as buffer_heads_over_limit may - * have adjusted it. + * If the pgdat is imbalanced then ignore boosting and preserve + * the watermarks for a later time and restart. Note that the + * zone watermarks will be still reset at the end of balancing + * on the grounds that the normal reclaim should be enough to + * re-evaluate if boosting is required when kswapd next wakes. + */ + balanced = pgdat_balanced(pgdat, sc.order, classzone_idx); + if (!balanced && nr_boost_reclaim) { + nr_boost_reclaim = 0; + goto restart; + } + + /* + * If boosting is not active then only reclaim if there are no + * eligible zones. Note that sc.reclaim_idx is not used as + * buffer_heads_over_limit may have adjusted it. */ - if (pgdat_balanced(pgdat, sc.order, classzone_idx)) + if (!nr_boost_reclaim && balanced) goto out; + /* Limit the priority of boosting to avoid reclaim writeback */ + if (nr_boost_reclaim && sc.priority == DEF_PRIORITY - 2) + raise_priority = false; + + /* + * Do not writeback or swap pages for boosted reclaim. The + * intent is to relieve pressure not issue sub-optimal IO + * from reclaim context. If no pages are reclaimed, the + * reclaim will be aborted. + */ + sc.may_writepage = !laptop_mode && !nr_boost_reclaim; + sc.may_swap = !nr_boost_reclaim; + sc.may_shrinkslab = !nr_boost_reclaim; + /* * Do some background aging of the anon list, to give * pages a chance to be referenced before reclaiming. All @@ -3619,6 +3701,16 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) * progress in reclaiming pages */ nr_reclaimed = sc.nr_reclaimed - nr_reclaimed; + nr_boost_reclaim -= min(nr_boost_reclaim, nr_reclaimed); + + /* + * If reclaim made no progress for a boost, stop reclaim as + * IO cannot be queued and it could be an infinite loop in + * extreme circumstances. + */ + if (nr_boost_reclaim && !nr_reclaimed) + break; + if (raise_priority || !nr_reclaimed) sc.priority--; } while (sc.priority >= 1); @@ -3627,6 +3719,28 @@ static int balance_pgdat(pg_data_t *pgdat, int order, int classzone_idx) pgdat->kswapd_failures++; out: + /* If reclaim was boosted, account for the reclaim done in this pass */ + if (boosted) { + unsigned long flags; + + for (i = 0; i <= classzone_idx; i++) { + if (!zone_boosts[i]) + continue; + + /* Increments are under the zone lock */ + zone = pgdat->node_zones + i; + spin_lock_irqsave(&zone->lock, flags); + zone->watermark_boost -= min(zone->watermark_boost, zone_boosts[i]); + spin_unlock_irqrestore(&zone->lock, flags); + } + + /* + * As there is now likely space, wakeup kcompact to defragment + * pageblocks. + */ + wakeup_kcompactd(pgdat, pageblock_order, classzone_idx); + } + snapshot_refaults(NULL, pgdat); __fs_reclaim_release(); psi_memstall_leave(&pflags); @@ -3855,7 +3969,8 @@ void wakeup_kswapd(struct zone *zone, gfp_t gfp_flags, int order, /* Hopeless node, leave it to direct reclaim if possible */ if (pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES || - pgdat_balanced(pgdat, order, classzone_idx)) { + (pgdat_balanced(pgdat, order, classzone_idx) && + !pgdat_watermark_boosted(pgdat, classzone_idx))) { /* * There may be plenty of free memory available, but it's too * fragmented for high-order allocations. Wake up kcompactd -- cgit v1.2.3-59-g8ed1b From ef8444ea01d7442652f8e1b8a8b94278cb57eafd Mon Sep 17 00:00:00 2001 From: yuzhoujian Date: Fri, 28 Dec 2018 00:36:07 -0800 Subject: mm, oom: reorganize the oom report in dump_header OOM report contains several sections. The first one is the allocation context that has triggered the OOM. Then we have cpuset context followed by the stack trace of the OOM path. The tird one is the OOM memory information. Followed by the current memory state of all system tasks. At last, we will show oom eligible tasks and the information about the chosen oom victim. One thing that makes parsing more awkward than necessary is that we do not have a single and easily parsable line about the oom context. This patch is reorganizing the oom report to 1) who invoked oom and what was the allocation request [ 515.902945] tuned invoked oom-killer: gfp_mask=0x6200ca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=0 2) OOM stack trace [ 515.904273] CPU: 24 PID: 1809 Comm: tuned Not tainted 4.20.0-rc3+ #3 [ 515.905518] Hardware name: Inspur SA5212M4/YZMB-00370-107, BIOS 4.1.10 11/14/2016 [ 515.906821] Call Trace: [ 515.908062] dump_stack+0x5a/0x73 [ 515.909311] dump_header+0x55/0x28c [ 515.914260] oom_kill_process+0x2d8/0x300 [ 515.916708] out_of_memory+0x145/0x4a0 [ 515.917932] __alloc_pages_slowpath+0x7d2/0xa16 [ 515.919157] __alloc_pages_nodemask+0x277/0x290 [ 515.920367] filemap_fault+0x3d0/0x6c0 [ 515.921529] ? filemap_map_pages+0x2b8/0x420 [ 515.922709] ext4_filemap_fault+0x2c/0x40 [ext4] [ 515.923884] __do_fault+0x20/0x80 [ 515.925032] __handle_mm_fault+0xbc0/0xe80 [ 515.926195] handle_mm_fault+0xfa/0x210 [ 515.927357] __do_page_fault+0x233/0x4c0 [ 515.928506] do_page_fault+0x32/0x140 [ 515.929646] ? page_fault+0x8/0x30 [ 515.930770] page_fault+0x1e/0x30 3) OOM memory information [ 515.958093] Mem-Info: [ 515.959647] active_anon:26501758 inactive_anon:1179809 isolated_anon:0 active_file:4402672 inactive_file:483963 isolated_file:1344 unevictable:0 dirty:4886753 writeback:0 unstable:0 slab_reclaimable:148442 slab_unreclaimable:18741 mapped:1347 shmem:1347 pagetables:58669 bounce:0 free:88663 free_pcp:0 free_cma:0 ... 4) current memory state of all system tasks [ 516.079544] [ 744] 0 744 9211 1345 114688 82 0 systemd-journal [ 516.082034] [ 787] 0 787 31764 0 143360 92 0 lvmetad [ 516.084465] [ 792] 0 792 10930 1 110592 208 -1000 systemd-udevd [ 516.086865] [ 1199] 0 1199 13866 0 131072 112 -1000 auditd [ 516.089190] [ 1222] 0 1222 31990 1 110592 157 0 smartd [ 516.091477] [ 1225] 0 1225 4864 85 81920 43 0 irqbalance [ 516.093712] [ 1226] 0 1226 52612 0 258048 426 0 abrtd [ 516.112128] [ 1280] 0 1280 109774 55 299008 400 0 NetworkManager [ 516.113998] [ 1295] 0 1295 28817 37 69632 24 0 ksmtuned [ 516.144596] [ 10718] 0 10718 2622484 1721372 15998976 267219 0 panic [ 516.145792] [ 10719] 0 10719 2622484 1164767 9818112 53576 0 panic [ 516.146977] [ 10720] 0 10720 2622484 1174361 9904128 53709 0 panic [ 516.148163] [ 10721] 0 10721 2622484 1209070 10194944 54824 0 panic [ 516.149329] [ 10722] 0 10722 2622484 1745799 14774272 91138 0 panic 5) oom context (contrains and the chosen victim). oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0-1,task=panic,pid=10737,uid=0 An admin can easily get the full oom context at a single line which makes parsing much easier. Link: http://lkml.kernel.org/r/1542799799-36184-1-git-send-email-ufo19890607@gmail.com Signed-off-by: yuzhoujian Acked-by: Michal Hocko Cc: Andrea Arcangeli Cc: David Rientjes Cc: "Kirill A . Shutemov" Cc: Roman Gushchin Cc: Tetsuo Handa Cc: Yang Shi Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/oom.h | 10 ++++++++++ kernel/cgroup/cpuset.c | 4 ++-- mm/oom_kill.c | 29 ++++++++++++++++++++--------- mm/page_alloc.c | 4 ++-- 4 files changed, 34 insertions(+), 13 deletions(-) (limited to 'kernel') diff --git a/include/linux/oom.h b/include/linux/oom.h index 69864a547663..d07992009265 100644 --- a/include/linux/oom.h +++ b/include/linux/oom.h @@ -15,6 +15,13 @@ struct notifier_block; struct mem_cgroup; struct task_struct; +enum oom_constraint { + CONSTRAINT_NONE, + CONSTRAINT_CPUSET, + CONSTRAINT_MEMORY_POLICY, + CONSTRAINT_MEMCG, +}; + /* * Details of the page allocation that triggered the oom killer that are used to * determine what should be killed. @@ -42,6 +49,9 @@ struct oom_control { unsigned long totalpages; struct task_struct *chosen; unsigned long chosen_points; + + /* Used to print the constraint info. */ + enum oom_constraint constraint; }; extern struct mutex oom_lock; diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c index 266f10cb7222..9510a5b32eaf 100644 --- a/kernel/cgroup/cpuset.c +++ b/kernel/cgroup/cpuset.c @@ -2666,9 +2666,9 @@ void cpuset_print_current_mems_allowed(void) rcu_read_lock(); cgrp = task_cs(current)->css.cgroup; - pr_info("%s cpuset=", current->comm); + pr_cont(",cpuset="); pr_cont_cgroup_name(cgrp); - pr_cont(" mems_allowed=%*pbl\n", + pr_cont(",mems_allowed=%*pbl", nodemask_pr_args(¤t->mems_allowed)); rcu_read_unlock(); diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 21d487749e1d..d90253f1ff93 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -245,11 +245,11 @@ unsigned long oom_badness(struct task_struct *p, struct mem_cgroup *memcg, return points > 0 ? points : 1; } -enum oom_constraint { - CONSTRAINT_NONE, - CONSTRAINT_CPUSET, - CONSTRAINT_MEMORY_POLICY, - CONSTRAINT_MEMCG, +static const char * const oom_constraint_text[] = { + [CONSTRAINT_NONE] = "CONSTRAINT_NONE", + [CONSTRAINT_CPUSET] = "CONSTRAINT_CPUSET", + [CONSTRAINT_MEMORY_POLICY] = "CONSTRAINT_MEMORY_POLICY", + [CONSTRAINT_MEMCG] = "CONSTRAINT_MEMCG", }; /* @@ -428,16 +428,25 @@ static void dump_tasks(struct mem_cgroup *memcg, const nodemask_t *nodemask) rcu_read_unlock(); } +static void dump_oom_summary(struct oom_control *oc, struct task_struct *victim) +{ + /* one line summary of the oom killer context. */ + pr_info("oom-kill:constraint=%s,nodemask=%*pbl", + oom_constraint_text[oc->constraint], + nodemask_pr_args(oc->nodemask)); + cpuset_print_current_mems_allowed(); + pr_cont(",task=%s,pid=%d,uid=%d\n", victim->comm, victim->pid, + from_kuid(&init_user_ns, task_uid(victim))); +} + static void dump_header(struct oom_control *oc, struct task_struct *p) { - pr_warn("%s invoked oom-killer: gfp_mask=%#x(%pGg), nodemask=%*pbl, order=%d, oom_score_adj=%hd\n", - current->comm, oc->gfp_mask, &oc->gfp_mask, - nodemask_pr_args(oc->nodemask), oc->order, + pr_warn("%s invoked oom-killer: gfp_mask=%#x(%pGg), order=%d, oom_score_adj=%hd\n", + current->comm, oc->gfp_mask, &oc->gfp_mask, oc->order, current->signal->oom_score_adj); if (!IS_ENABLED(CONFIG_COMPACTION) && oc->order) pr_warn("COMPACTION is disabled!!!\n"); - cpuset_print_current_mems_allowed(); dump_stack(); if (is_memcg_oom(oc)) mem_cgroup_print_oom_info(oc->memcg, p); @@ -448,6 +457,8 @@ static void dump_header(struct oom_control *oc, struct task_struct *p) } if (sysctl_oom_dump_tasks) dump_tasks(oc->memcg, oc->nodemask); + if (p) + dump_oom_summary(oc, p); } /* diff --git a/mm/page_alloc.c b/mm/page_alloc.c index e97ebaf5ba26..a48db99da7b5 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3517,13 +3517,13 @@ void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...) va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; - pr_warn("%s: %pV, mode:%#x(%pGg), nodemask=%*pbl\n", + pr_warn("%s: %pV, mode:%#x(%pGg), nodemask=%*pbl", current->comm, &vaf, gfp_mask, &gfp_mask, nodemask_pr_args(nodemask)); va_end(args); cpuset_print_current_mems_allowed(); - + pr_cont("\n"); dump_stack(); warn_alloc_show_mem(gfp_mask, nodemask); } -- cgit v1.2.3-59-g8ed1b From 2c2a5af6fed20cf74401c9d64319c76c5ff81309 Mon Sep 17 00:00:00 2001 From: Oscar Salvador Date: Fri, 28 Dec 2018 00:36:22 -0800 Subject: mm, memory_hotplug: add nid parameter to arch_remove_memory Patch series "Do not touch pages in hot-remove path", v2. This patchset aims for two things: 1) A better definition about offline and hot-remove stage 2) Solving bugs where we can access non-initialized pages during hot-remove operations [2] [3]. This is achieved by moving all page/zone handling to the offline stage, so we do not need to access pages when hot-removing memory. [1] https://patchwork.kernel.org/cover/10691415/ [2] https://patchwork.kernel.org/patch/10547445/ [3] https://www.spinics.net/lists/linux-mm/msg161316.html This patch (of 5): This is a preparation for the following-up patches. The idea of passing the nid is that it will allow us to get rid of the zone parameter afterwards. Link: http://lkml.kernel.org/r/20181127162005.15833-2-osalvador@suse.de Signed-off-by: Oscar Salvador Reviewed-by: David Hildenbrand Reviewed-by: Pavel Tatashin Cc: Michal Hocko Cc: Dan Williams Cc: Jerome Glisse Cc: Jonathan Cameron Cc: "Rafael J. Wysocki" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- arch/ia64/mm/init.c | 2 +- arch/powerpc/mm/mem.c | 3 ++- arch/s390/mm/init.c | 2 +- arch/sh/mm/init.c | 2 +- arch/x86/mm/init_32.c | 2 +- arch/x86/mm/init_64.c | 3 ++- include/linux/memory_hotplug.h | 4 ++-- kernel/memremap.c | 5 ++++- mm/memory_hotplug.c | 2 +- 9 files changed, 15 insertions(+), 10 deletions(-) (limited to 'kernel') diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c index d5e12ff1d73c..904fe55e10fc 100644 --- a/arch/ia64/mm/init.c +++ b/arch/ia64/mm/init.c @@ -661,7 +661,7 @@ int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap, } #ifdef CONFIG_MEMORY_HOTREMOVE -int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) +int arch_remove_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap) { unsigned long start_pfn = start >> PAGE_SHIFT; unsigned long nr_pages = size >> PAGE_SHIFT; diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index 20394e52fe27..33cc6f676fa6 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -139,7 +139,8 @@ int __meminit arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap * } #ifdef CONFIG_MEMORY_HOTREMOVE -int __meminit arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) +int __meminit arch_remove_memory(int nid, u64 start, u64 size, + struct vmem_altmap *altmap) { unsigned long start_pfn = start >> PAGE_SHIFT; unsigned long nr_pages = size >> PAGE_SHIFT; diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index 50388190b393..3e82f66d5c61 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -242,7 +242,7 @@ int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap, } #ifdef CONFIG_MEMORY_HOTREMOVE -int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) +int arch_remove_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap) { /* * There is no hardware or firmware interface which could trigger a diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c index c8c13c777162..a8e5c0e00fca 100644 --- a/arch/sh/mm/init.c +++ b/arch/sh/mm/init.c @@ -443,7 +443,7 @@ EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); #endif #ifdef CONFIG_MEMORY_HOTREMOVE -int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) +int arch_remove_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap) { unsigned long start_pfn = PFN_DOWN(start); unsigned long nr_pages = size >> PAGE_SHIFT; diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c index 49ecf5ecf6d3..85c94f9a87f8 100644 --- a/arch/x86/mm/init_32.c +++ b/arch/x86/mm/init_32.c @@ -860,7 +860,7 @@ int arch_add_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap, } #ifdef CONFIG_MEMORY_HOTREMOVE -int arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) +int arch_remove_memory(int nid, u64 start, u64 size, struct vmem_altmap *altmap) { unsigned long start_pfn = start >> PAGE_SHIFT; unsigned long nr_pages = size >> PAGE_SHIFT; diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 484c1b92f078..bccff68e3267 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1141,7 +1141,8 @@ kernel_physical_mapping_remove(unsigned long start, unsigned long end) remove_pagetable(start, end, true, NULL); } -int __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap) +int __ref arch_remove_memory(int nid, u64 start, u64 size, + struct vmem_altmap *altmap) { unsigned long start_pfn = start >> PAGE_SHIFT; unsigned long nr_pages = size >> PAGE_SHIFT; diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h index 7383a7a76d69..9e4d9b9b93ea 100644 --- a/include/linux/memory_hotplug.h +++ b/include/linux/memory_hotplug.h @@ -107,8 +107,8 @@ static inline bool movable_node_is_enabled(void) } #ifdef CONFIG_MEMORY_HOTREMOVE -extern int arch_remove_memory(u64 start, u64 size, - struct vmem_altmap *altmap); +extern int arch_remove_memory(int nid, u64 start, u64 size, + struct vmem_altmap *altmap); extern int __remove_pages(struct zone *zone, unsigned long start_pfn, unsigned long nr_pages, struct vmem_altmap *altmap); #endif /* CONFIG_MEMORY_HOTREMOVE */ diff --git a/kernel/memremap.c b/kernel/memremap.c index 3eef989ef035..0d5603d76c37 100644 --- a/kernel/memremap.c +++ b/kernel/memremap.c @@ -87,6 +87,7 @@ static void devm_memremap_pages_release(void *data) struct resource *res = &pgmap->res; resource_size_t align_start, align_size; unsigned long pfn; + int nid; pgmap->kill(pgmap->ref); for_each_device_pfn(pfn, pgmap) @@ -97,13 +98,15 @@ static void devm_memremap_pages_release(void *data) align_size = ALIGN(res->start + resource_size(res), SECTION_SIZE) - align_start; + nid = page_to_nid(pfn_to_page(align_start >> PAGE_SHIFT)); + mem_hotplug_begin(); if (pgmap->type == MEMORY_DEVICE_PRIVATE) { pfn = align_start >> PAGE_SHIFT; __remove_pages(page_zone(pfn_to_page(pfn)), pfn, align_size >> PAGE_SHIFT, NULL); } else { - arch_remove_memory(align_start, align_size, + arch_remove_memory(nid, align_start, align_size, pgmap->altmap_valid ? &pgmap->altmap : NULL); kasan_remove_zero_shadow(__va(align_start), align_size); } diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 6258e0e923cc..0718cf7427b2 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1841,7 +1841,7 @@ void __ref __remove_memory(int nid, u64 start, u64 size) memblock_free(start, size); memblock_remove(start, size); - arch_remove_memory(start, size, NULL); + arch_remove_memory(nid, start, size, NULL); try_offline_node(nid); -- cgit v1.2.3-59-g8ed1b From 65c78784135f847e49eb98e6b976e453e71100c3 Mon Sep 17 00:00:00 2001 From: Oscar Salvador Date: Fri, 28 Dec 2018 00:36:26 -0800 Subject: kernel, resource: check for IORESOURCE_SYSRAM in release_mem_region_adjustable This is a preparation for the next patch. Currently, we only call release_mem_region_adjustable() in __remove_pages if the zone is not ZONE_DEVICE, because resources that belong to HMM/devm are being released by themselves with devm_release_mem_region. Since we do not want to touch any zone/page stuff during the removing of the memory (but during the offlining), we do not want to check for the zone here. So we need another way to tell release_mem_region_adjustable() to not realease the resource in case it belongs to HMM/devm. HMM/devm acquires/releases a resource through devm_request_mem_region/devm_release_mem_region. These resources have the flag IORESOURCE_MEM, while resources acquired by hot-add memory path (register_memory_resource()) contain IORESOURCE_SYSTEM_RAM. So, we can check for this flag in release_mem_region_adjustable, and if the resource does not contain such flag, we know that we are dealing with a HMM/devm resource, so we can back off. Link: http://lkml.kernel.org/r/20181127162005.15833-3-osalvador@suse.de Signed-off-by: Oscar Salvador Reviewed-by: David Hildenbrand Reviewed-by: Pavel Tatashin Cc: Dan Williams Cc: Jerome Glisse Cc: Jonathan Cameron Cc: Michal Hocko Cc: Oscar Salvador Cc: "Rafael J. Wysocki" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/resource.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'kernel') diff --git a/kernel/resource.c b/kernel/resource.c index b0fbf685c77a..915c02e8e5dd 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -1256,6 +1256,21 @@ int release_mem_region_adjustable(struct resource *parent, continue; } + /* + * All memory regions added from memory-hotplug path have the + * flag IORESOURCE_SYSTEM_RAM. If the resource does not have + * this flag, we know that we are dealing with a resource coming + * from HMM/devm. HMM/devm use another mechanism to add/release + * a resource. This goes via devm_request_mem_region and + * devm_release_mem_region. + * HMM/devm take care to release their resources when they want, + * so if we are dealing with them, let us just back off here. + */ + if (!(res->flags & IORESOURCE_SYSRAM)) { + ret = 0; + break; + } + if (!(res->flags & IORESOURCE_MEM)) break; -- cgit v1.2.3-59-g8ed1b From ac46d4f3c43241ffa23d5bf36153a0830c0e02cc Mon Sep 17 00:00:00 2001 From: Jérôme Glisse Date: Fri, 28 Dec 2018 00:38:09 -0800 Subject: mm/mmu_notifier: use structure for invalidate_range_start/end calls v2 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit To avoid having to change many call sites everytime we want to add a parameter use a structure to group all parameters for the mmu_notifier invalidate_range_start/end cakks. No functional changes with this patch. [akpm@linux-foundation.org: coding style fixes] Link: http://lkml.kernel.org/r/20181205053628.3210-3-jglisse@redhat.com Signed-off-by: Jérôme Glisse Acked-by: Christian König Acked-by: Jan Kara Cc: Matthew Wilcox Cc: Ross Zwisler Cc: Dan Williams Cc: Paolo Bonzini Cc: Radim Krcmar Cc: Michal Hocko Cc: Felix Kuehling Cc: Ralph Campbell Cc: John Hubbard From: Jérôme Glisse Subject: mm/mmu_notifier: use structure for invalidate_range_start/end calls v3 fix build warning in migrate.c when CONFIG_MMU_NOTIFIER=n Link: http://lkml.kernel.org/r/20181213171330.8489-3-jglisse@redhat.com Signed-off-by: Jérôme Glisse Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/dax.c | 8 ++-- fs/proc/task_mmu.c | 7 +++- include/linux/mm.h | 6 ++- include/linux/mmu_notifier.h | 87 +++++++++++++++++++++++++------------- kernel/events/uprobes.c | 10 ++--- mm/huge_memory.c | 54 +++++++++++------------- mm/hugetlb.c | 52 +++++++++++------------ mm/khugepaged.c | 10 ++--- mm/ksm.c | 21 ++++------ mm/madvise.c | 21 +++++----- mm/memory.c | 99 ++++++++++++++++++++++---------------------- mm/migrate.c | 28 ++++++------- mm/mmu_notifier.c | 37 ++++------------- mm/mprotect.c | 15 +++---- mm/mremap.c | 10 ++--- mm/oom_kill.c | 17 ++++---- mm/rmap.c | 30 ++++++++------ 17 files changed, 262 insertions(+), 250 deletions(-) (limited to 'kernel') diff --git a/fs/dax.c b/fs/dax.c index 48132eca3761..262e14f29933 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -779,7 +779,8 @@ static void dax_entry_mkclean(struct address_space *mapping, pgoff_t index, i_mmap_lock_read(mapping); vma_interval_tree_foreach(vma, &mapping->i_mmap, index, index) { - unsigned long address, start, end; + struct mmu_notifier_range range; + unsigned long address; cond_resched(); @@ -793,7 +794,8 @@ static void dax_entry_mkclean(struct address_space *mapping, pgoff_t index, * call mmu_notifier_invalidate_range_start() on our behalf * before taking any lock. */ - if (follow_pte_pmd(vma->vm_mm, address, &start, &end, &ptep, &pmdp, &ptl)) + if (follow_pte_pmd(vma->vm_mm, address, &range, + &ptep, &pmdp, &ptl)) continue; /* @@ -835,7 +837,7 @@ unlock_pte: pte_unmap_unlock(ptep, ptl); } - mmu_notifier_invalidate_range_end(vma->vm_mm, start, end); + mmu_notifier_invalidate_range_end(&range); } i_mmap_unlock_read(mapping); } diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 47c3764c469b..b3ddceb003bc 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -1096,6 +1096,7 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf, return -ESRCH; mm = get_task_mm(task); if (mm) { + struct mmu_notifier_range range; struct clear_refs_private cp = { .type = type, }; @@ -1139,11 +1140,13 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf, downgrade_write(&mm->mmap_sem); break; } - mmu_notifier_invalidate_range_start(mm, 0, -1); + + mmu_notifier_range_init(&range, mm, 0, -1UL); + mmu_notifier_invalidate_range_start(&range); } walk_page_range(0, mm->highest_vm_end, &clear_refs_walk); if (type == CLEAR_REFS_SOFT_DIRTY) - mmu_notifier_invalidate_range_end(mm, 0, -1); + mmu_notifier_invalidate_range_end(&range); tlb_finish_mmu(&tlb, 0, -1); up_read(&mm->mmap_sem); out_mm: diff --git a/include/linux/mm.h b/include/linux/mm.h index 3c39b9dc7a90..ea1f12d15365 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1451,6 +1451,8 @@ struct mm_walk { void *private; }; +struct mmu_notifier_range; + int walk_page_range(unsigned long addr, unsigned long end, struct mm_walk *walk); int walk_page_vma(struct vm_area_struct *vma, struct mm_walk *walk); @@ -1459,8 +1461,8 @@ void free_pgd_range(struct mmu_gather *tlb, unsigned long addr, int copy_page_range(struct mm_struct *dst, struct mm_struct *src, struct vm_area_struct *vma); int follow_pte_pmd(struct mm_struct *mm, unsigned long address, - unsigned long *start, unsigned long *end, - pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp); + struct mmu_notifier_range *range, + pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp); int follow_pfn(struct vm_area_struct *vma, unsigned long address, unsigned long *pfn); int follow_phys(struct vm_area_struct *vma, unsigned long address, diff --git a/include/linux/mmu_notifier.h b/include/linux/mmu_notifier.h index 3d377805b29c..4050ec1c3b45 100644 --- a/include/linux/mmu_notifier.h +++ b/include/linux/mmu_notifier.h @@ -220,11 +220,8 @@ extern int __mmu_notifier_test_young(struct mm_struct *mm, unsigned long address); extern void __mmu_notifier_change_pte(struct mm_struct *mm, unsigned long address, pte_t pte); -extern int __mmu_notifier_invalidate_range_start(struct mm_struct *mm, - unsigned long start, unsigned long end, - bool blockable); -extern void __mmu_notifier_invalidate_range_end(struct mm_struct *mm, - unsigned long start, unsigned long end, +extern int __mmu_notifier_invalidate_range_start(struct mmu_notifier_range *r); +extern void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *r, bool only_end); extern void __mmu_notifier_invalidate_range(struct mm_struct *mm, unsigned long start, unsigned long end); @@ -268,33 +265,37 @@ static inline void mmu_notifier_change_pte(struct mm_struct *mm, __mmu_notifier_change_pte(mm, address, pte); } -static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm, - unsigned long start, unsigned long end) +static inline void +mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range) { - if (mm_has_notifiers(mm)) - __mmu_notifier_invalidate_range_start(mm, start, end, true); + if (mm_has_notifiers(range->mm)) { + range->blockable = true; + __mmu_notifier_invalidate_range_start(range); + } } -static inline int mmu_notifier_invalidate_range_start_nonblock(struct mm_struct *mm, - unsigned long start, unsigned long end) +static inline int +mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range) { - if (mm_has_notifiers(mm)) - return __mmu_notifier_invalidate_range_start(mm, start, end, false); + if (mm_has_notifiers(range->mm)) { + range->blockable = false; + return __mmu_notifier_invalidate_range_start(range); + } return 0; } -static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm, - unsigned long start, unsigned long end) +static inline void +mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range) { - if (mm_has_notifiers(mm)) - __mmu_notifier_invalidate_range_end(mm, start, end, false); + if (mm_has_notifiers(range->mm)) + __mmu_notifier_invalidate_range_end(range, false); } -static inline void mmu_notifier_invalidate_range_only_end(struct mm_struct *mm, - unsigned long start, unsigned long end) +static inline void +mmu_notifier_invalidate_range_only_end(struct mmu_notifier_range *range) { - if (mm_has_notifiers(mm)) - __mmu_notifier_invalidate_range_end(mm, start, end, true); + if (mm_has_notifiers(range->mm)) + __mmu_notifier_invalidate_range_end(range, true); } static inline void mmu_notifier_invalidate_range(struct mm_struct *mm, @@ -315,6 +316,17 @@ static inline void mmu_notifier_mm_destroy(struct mm_struct *mm) __mmu_notifier_mm_destroy(mm); } + +static inline void mmu_notifier_range_init(struct mmu_notifier_range *range, + struct mm_struct *mm, + unsigned long start, + unsigned long end) +{ + range->mm = mm; + range->start = start; + range->end = end; +} + #define ptep_clear_flush_young_notify(__vma, __address, __ptep) \ ({ \ int __young; \ @@ -427,6 +439,23 @@ extern void mmu_notifier_call_srcu(struct rcu_head *rcu, #else /* CONFIG_MMU_NOTIFIER */ +struct mmu_notifier_range { + unsigned long start; + unsigned long end; +}; + +static inline void _mmu_notifier_range_init(struct mmu_notifier_range *range, + unsigned long start, + unsigned long end) +{ + range->start = start; + range->end = end; +} + +#define mmu_notifier_range_init(range, mm, start, end) \ + _mmu_notifier_range_init(range, start, end) + + static inline int mm_has_notifiers(struct mm_struct *mm) { return 0; @@ -454,24 +483,24 @@ static inline void mmu_notifier_change_pte(struct mm_struct *mm, { } -static inline void mmu_notifier_invalidate_range_start(struct mm_struct *mm, - unsigned long start, unsigned long end) +static inline void +mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range) { } -static inline int mmu_notifier_invalidate_range_start_nonblock(struct mm_struct *mm, - unsigned long start, unsigned long end) +static inline int +mmu_notifier_invalidate_range_start_nonblock(struct mmu_notifier_range *range) { return 0; } -static inline void mmu_notifier_invalidate_range_end(struct mm_struct *mm, - unsigned long start, unsigned long end) +static inline +void mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range) { } -static inline void mmu_notifier_invalidate_range_only_end(struct mm_struct *mm, - unsigned long start, unsigned long end) +static inline void +mmu_notifier_invalidate_range_only_end(struct mmu_notifier_range *range) { } diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c index abbd8da9ac21..8aef47ee7bfa 100644 --- a/kernel/events/uprobes.c +++ b/kernel/events/uprobes.c @@ -171,11 +171,11 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr, .address = addr, }; int err; - /* For mmu_notifiers */ - const unsigned long mmun_start = addr; - const unsigned long mmun_end = addr + PAGE_SIZE; + struct mmu_notifier_range range; struct mem_cgroup *memcg; + mmu_notifier_range_init(&range, mm, addr, addr + PAGE_SIZE); + VM_BUG_ON_PAGE(PageTransHuge(old_page), old_page); err = mem_cgroup_try_charge(new_page, vma->vm_mm, GFP_KERNEL, &memcg, @@ -186,7 +186,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr, /* For try_to_free_swap() and munlock_vma_page() below */ lock_page(old_page); - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); + mmu_notifier_invalidate_range_start(&range); err = -EAGAIN; if (!page_vma_mapped_walk(&pvmw)) { mem_cgroup_cancel_charge(new_page, memcg, false); @@ -220,7 +220,7 @@ static int __replace_page(struct vm_area_struct *vma, unsigned long addr, err = 0; unlock: - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); + mmu_notifier_invalidate_range_end(&range); unlock_page(old_page); return err; } diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 0c0e18409fde..05136ad0f325 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -1134,8 +1134,7 @@ static vm_fault_t do_huge_pmd_wp_page_fallback(struct vm_fault *vmf, int i; vm_fault_t ret = 0; struct page **pages; - unsigned long mmun_start; /* For mmu_notifiers */ - unsigned long mmun_end; /* For mmu_notifiers */ + struct mmu_notifier_range range; pages = kmalloc_array(HPAGE_PMD_NR, sizeof(struct page *), GFP_KERNEL); @@ -1173,9 +1172,9 @@ static vm_fault_t do_huge_pmd_wp_page_fallback(struct vm_fault *vmf, cond_resched(); } - mmun_start = haddr; - mmun_end = haddr + HPAGE_PMD_SIZE; - mmu_notifier_invalidate_range_start(vma->vm_mm, mmun_start, mmun_end); + mmu_notifier_range_init(&range, vma->vm_mm, haddr, + haddr + HPAGE_PMD_SIZE); + mmu_notifier_invalidate_range_start(&range); vmf->ptl = pmd_lock(vma->vm_mm, vmf->pmd); if (unlikely(!pmd_same(*vmf->pmd, orig_pmd))) @@ -1220,8 +1219,7 @@ static vm_fault_t do_huge_pmd_wp_page_fallback(struct vm_fault *vmf, * No need to double call mmu_notifier->invalidate_range() callback as * the above pmdp_huge_clear_flush_notify() did already call it. */ - mmu_notifier_invalidate_range_only_end(vma->vm_mm, mmun_start, - mmun_end); + mmu_notifier_invalidate_range_only_end(&range); ret |= VM_FAULT_WRITE; put_page(page); @@ -1231,7 +1229,7 @@ out: out_free_pages: spin_unlock(vmf->ptl); - mmu_notifier_invalidate_range_end(vma->vm_mm, mmun_start, mmun_end); + mmu_notifier_invalidate_range_end(&range); for (i = 0; i < HPAGE_PMD_NR; i++) { memcg = (void *)page_private(pages[i]); set_page_private(pages[i], 0); @@ -1248,8 +1246,7 @@ vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd) struct page *page = NULL, *new_page; struct mem_cgroup *memcg; unsigned long haddr = vmf->address & HPAGE_PMD_MASK; - unsigned long mmun_start; /* For mmu_notifiers */ - unsigned long mmun_end; /* For mmu_notifiers */ + struct mmu_notifier_range range; gfp_t huge_gfp; /* for allocation and charge */ vm_fault_t ret = 0; @@ -1338,9 +1335,9 @@ alloc: vma, HPAGE_PMD_NR); __SetPageUptodate(new_page); - mmun_start = haddr; - mmun_end = haddr + HPAGE_PMD_SIZE; - mmu_notifier_invalidate_range_start(vma->vm_mm, mmun_start, mmun_end); + mmu_notifier_range_init(&range, vma->vm_mm, haddr, + haddr + HPAGE_PMD_SIZE); + mmu_notifier_invalidate_range_start(&range); spin_lock(vmf->ptl); if (page) @@ -1375,8 +1372,7 @@ out_mn: * No need to double call mmu_notifier->invalidate_range() callback as * the above pmdp_huge_clear_flush_notify() did already call it. */ - mmu_notifier_invalidate_range_only_end(vma->vm_mm, mmun_start, - mmun_end); + mmu_notifier_invalidate_range_only_end(&range); out: return ret; out_unlock: @@ -2015,14 +2011,15 @@ void __split_huge_pud(struct vm_area_struct *vma, pud_t *pud, unsigned long address) { spinlock_t *ptl; - struct mm_struct *mm = vma->vm_mm; - unsigned long haddr = address & HPAGE_PUD_MASK; + struct mmu_notifier_range range; - mmu_notifier_invalidate_range_start(mm, haddr, haddr + HPAGE_PUD_SIZE); - ptl = pud_lock(mm, pud); + mmu_notifier_range_init(&range, vma->vm_mm, address & HPAGE_PUD_MASK, + (address & HPAGE_PUD_MASK) + HPAGE_PUD_SIZE); + mmu_notifier_invalidate_range_start(&range); + ptl = pud_lock(vma->vm_mm, pud); if (unlikely(!pud_trans_huge(*pud) && !pud_devmap(*pud))) goto out; - __split_huge_pud_locked(vma, pud, haddr); + __split_huge_pud_locked(vma, pud, range.start); out: spin_unlock(ptl); @@ -2030,8 +2027,7 @@ out: * No need to double call mmu_notifier->invalidate_range() callback as * the above pudp_huge_clear_flush_notify() did already call it. */ - mmu_notifier_invalidate_range_only_end(mm, haddr, haddr + - HPAGE_PUD_SIZE); + mmu_notifier_invalidate_range_only_end(&range); } #endif /* CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD */ @@ -2233,11 +2229,12 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, unsigned long address, bool freeze, struct page *page) { spinlock_t *ptl; - struct mm_struct *mm = vma->vm_mm; - unsigned long haddr = address & HPAGE_PMD_MASK; + struct mmu_notifier_range range; - mmu_notifier_invalidate_range_start(mm, haddr, haddr + HPAGE_PMD_SIZE); - ptl = pmd_lock(mm, pmd); + mmu_notifier_range_init(&range, vma->vm_mm, address & HPAGE_PMD_MASK, + (address & HPAGE_PMD_MASK) + HPAGE_PMD_SIZE); + mmu_notifier_invalidate_range_start(&range); + ptl = pmd_lock(vma->vm_mm, pmd); /* * If caller asks to setup a migration entries, we need a page to check @@ -2253,7 +2250,7 @@ void __split_huge_pmd(struct vm_area_struct *vma, pmd_t *pmd, clear_page_mlock(page); } else if (!(pmd_devmap(*pmd) || is_pmd_migration_entry(*pmd))) goto out; - __split_huge_pmd_locked(vma, pmd, haddr, freeze); + __split_huge_pmd_locked(vma, pmd, range.start, freeze); out: spin_unlock(ptl); /* @@ -2269,8 +2266,7 @@ out: * any further changes to individual pte will notify. So no need * to call mmu_notifier->invalidate_range() */ - mmu_notifier_invalidate_range_only_end(mm, haddr, haddr + - HPAGE_PMD_SIZE); + mmu_notifier_invalidate_range_only_end(&range); } void split_huge_pmd_address(struct vm_area_struct *vma, unsigned long address, diff --git a/mm/hugetlb.c b/mm/hugetlb.c index a80832487981..12000ba5c868 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3240,16 +3240,16 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, int cow; struct hstate *h = hstate_vma(vma); unsigned long sz = huge_page_size(h); - unsigned long mmun_start; /* For mmu_notifiers */ - unsigned long mmun_end; /* For mmu_notifiers */ + struct mmu_notifier_range range; int ret = 0; cow = (vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE; - mmun_start = vma->vm_start; - mmun_end = vma->vm_end; - if (cow) - mmu_notifier_invalidate_range_start(src, mmun_start, mmun_end); + if (cow) { + mmu_notifier_range_init(&range, src, vma->vm_start, + vma->vm_end); + mmu_notifier_invalidate_range_start(&range); + } for (addr = vma->vm_start; addr < vma->vm_end; addr += sz) { spinlock_t *src_ptl, *dst_ptl; @@ -3325,7 +3325,7 @@ int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, } if (cow) - mmu_notifier_invalidate_range_end(src, mmun_start, mmun_end); + mmu_notifier_invalidate_range_end(&range); return ret; } @@ -3342,8 +3342,7 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, struct page *page; struct hstate *h = hstate_vma(vma); unsigned long sz = huge_page_size(h); - unsigned long mmun_start = start; /* For mmu_notifiers */ - unsigned long mmun_end = end; /* For mmu_notifiers */ + struct mmu_notifier_range range; WARN_ON(!is_vm_hugetlb_page(vma)); BUG_ON(start & ~huge_page_mask(h)); @@ -3359,8 +3358,9 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, /* * If sharing possible, alert mmu notifiers of worst case. */ - adjust_range_if_pmd_sharing_possible(vma, &mmun_start, &mmun_end); - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); + mmu_notifier_range_init(&range, mm, start, end); + adjust_range_if_pmd_sharing_possible(vma, &range.start, &range.end); + mmu_notifier_invalidate_range_start(&range); address = start; for (; address < end; address += sz) { ptep = huge_pte_offset(mm, address, sz); @@ -3428,7 +3428,7 @@ void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, if (ref_page) break; } - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); + mmu_notifier_invalidate_range_end(&range); tlb_end_vma(tlb, vma); } @@ -3546,9 +3546,8 @@ static vm_fault_t hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma, struct page *old_page, *new_page; int outside_reserve = 0; vm_fault_t ret = 0; - unsigned long mmun_start; /* For mmu_notifiers */ - unsigned long mmun_end; /* For mmu_notifiers */ unsigned long haddr = address & huge_page_mask(h); + struct mmu_notifier_range range; pte = huge_ptep_get(ptep); old_page = pte_page(pte); @@ -3627,9 +3626,8 @@ retry_avoidcopy: __SetPageUptodate(new_page); set_page_huge_active(new_page); - mmun_start = haddr; - mmun_end = mmun_start + huge_page_size(h); - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); + mmu_notifier_range_init(&range, mm, haddr, haddr + huge_page_size(h)); + mmu_notifier_invalidate_range_start(&range); /* * Retake the page table lock to check for racing updates @@ -3642,7 +3640,7 @@ retry_avoidcopy: /* Break COW */ huge_ptep_clear_flush(vma, haddr, ptep); - mmu_notifier_invalidate_range(mm, mmun_start, mmun_end); + mmu_notifier_invalidate_range(mm, range.start, range.end); set_huge_pte_at(mm, haddr, ptep, make_huge_pte(vma, new_page, 1)); page_remove_rmap(old_page, true); @@ -3651,7 +3649,7 @@ retry_avoidcopy: new_page = old_page; } spin_unlock(ptl); - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); + mmu_notifier_invalidate_range_end(&range); out_release_all: restore_reserve_on_error(h, vma, haddr, new_page); put_page(new_page); @@ -4340,21 +4338,21 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma, pte_t pte; struct hstate *h = hstate_vma(vma); unsigned long pages = 0; - unsigned long f_start = start; - unsigned long f_end = end; bool shared_pmd = false; + struct mmu_notifier_range range; /* * In the case of shared PMDs, the area to flush could be beyond - * start/end. Set f_start/f_end to cover the maximum possible + * start/end. Set range.start/range.end to cover the maximum possible * range if PMD sharing is possible. */ - adjust_range_if_pmd_sharing_possible(vma, &f_start, &f_end); + mmu_notifier_range_init(&range, mm, start, end); + adjust_range_if_pmd_sharing_possible(vma, &range.start, &range.end); BUG_ON(address >= end); - flush_cache_range(vma, f_start, f_end); + flush_cache_range(vma, range.start, range.end); - mmu_notifier_invalidate_range_start(mm, f_start, f_end); + mmu_notifier_invalidate_range_start(&range); i_mmap_lock_write(vma->vm_file->f_mapping); for (; address < end; address += huge_page_size(h)) { spinlock_t *ptl; @@ -4405,7 +4403,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma, * did unshare a page of pmds, flush the range corresponding to the pud. */ if (shared_pmd) - flush_hugetlb_tlb_range(vma, f_start, f_end); + flush_hugetlb_tlb_range(vma, range.start, range.end); else flush_hugetlb_tlb_range(vma, start, end); /* @@ -4415,7 +4413,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma, * See Documentation/vm/mmu_notifier.rst */ i_mmap_unlock_write(vma->vm_file->f_mapping); - mmu_notifier_invalidate_range_end(mm, f_start, f_end); + mmu_notifier_invalidate_range_end(&range); return pages << h->order; } diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 43ce2f4d2551..4f017339ddb2 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -944,8 +944,7 @@ static void collapse_huge_page(struct mm_struct *mm, int isolated = 0, result = 0; struct mem_cgroup *memcg; struct vm_area_struct *vma; - unsigned long mmun_start; /* For mmu_notifiers */ - unsigned long mmun_end; /* For mmu_notifiers */ + struct mmu_notifier_range range; gfp_t gfp; VM_BUG_ON(address & ~HPAGE_PMD_MASK); @@ -1017,9 +1016,8 @@ static void collapse_huge_page(struct mm_struct *mm, pte = pte_offset_map(pmd, address); pte_ptl = pte_lockptr(mm, pmd); - mmun_start = address; - mmun_end = address + HPAGE_PMD_SIZE; - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); + mmu_notifier_range_init(&range, mm, address, address + HPAGE_PMD_SIZE); + mmu_notifier_invalidate_range_start(&range); pmd_ptl = pmd_lock(mm, pmd); /* probably unnecessary */ /* * After this gup_fast can't run anymore. This also removes @@ -1029,7 +1027,7 @@ static void collapse_huge_page(struct mm_struct *mm, */ _pmd = pmdp_collapse_flush(vma, address, pmd); spin_unlock(pmd_ptl); - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); + mmu_notifier_invalidate_range_end(&range); spin_lock(pte_ptl); isolated = __collapse_huge_page_isolate(vma, address, pte); diff --git a/mm/ksm.c b/mm/ksm.c index 1a088306ef81..38c0360482fa 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -1042,8 +1042,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page, }; int swapped; int err = -EFAULT; - unsigned long mmun_start; /* For mmu_notifiers */ - unsigned long mmun_end; /* For mmu_notifiers */ + struct mmu_notifier_range range; pvmw.address = page_address_in_vma(page, vma); if (pvmw.address == -EFAULT) @@ -1051,9 +1050,9 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page, BUG_ON(PageTransCompound(page)); - mmun_start = pvmw.address; - mmun_end = pvmw.address + PAGE_SIZE; - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); + mmu_notifier_range_init(&range, mm, pvmw.address, + pvmw.address + PAGE_SIZE); + mmu_notifier_invalidate_range_start(&range); if (!page_vma_mapped_walk(&pvmw)) goto out_mn; @@ -1105,7 +1104,7 @@ static int write_protect_page(struct vm_area_struct *vma, struct page *page, out_unlock: page_vma_mapped_walk_done(&pvmw); out_mn: - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); + mmu_notifier_invalidate_range_end(&range); out: return err; } @@ -1129,8 +1128,7 @@ static int replace_page(struct vm_area_struct *vma, struct page *page, spinlock_t *ptl; unsigned long addr; int err = -EFAULT; - unsigned long mmun_start; /* For mmu_notifiers */ - unsigned long mmun_end; /* For mmu_notifiers */ + struct mmu_notifier_range range; addr = page_address_in_vma(page, vma); if (addr == -EFAULT) @@ -1140,9 +1138,8 @@ static int replace_page(struct vm_area_struct *vma, struct page *page, if (!pmd) goto out; - mmun_start = addr; - mmun_end = addr + PAGE_SIZE; - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); + mmu_notifier_range_init(&range, mm, addr, addr + PAGE_SIZE); + mmu_notifier_invalidate_range_start(&range); ptep = pte_offset_map_lock(mm, pmd, addr, &ptl); if (!pte_same(*ptep, orig_pte)) { @@ -1188,7 +1185,7 @@ static int replace_page(struct vm_area_struct *vma, struct page *page, pte_unmap_unlock(ptep, ptl); err = 0; out_mn: - mmu_notifier_invalidate_range_end(mm, mmun_start, mmun_end); + mmu_notifier_invalidate_range_end(&range); out: return err; } diff --git a/mm/madvise.c b/mm/madvise.c index 6cb1ca93e290..21a7881a2db4 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -458,29 +458,30 @@ static void madvise_free_page_range(struct mmu_gather *tlb, static int madvise_free_single_vma(struct vm_area_struct *vma, unsigned long start_addr, unsigned long end_addr) { - unsigned long start, end; struct mm_struct *mm = vma->vm_mm; + struct mmu_notifier_range range; struct mmu_gather tlb; /* MADV_FREE works for only anon vma at the moment */ if (!vma_is_anonymous(vma)) return -EINVAL; - start = max(vma->vm_start, start_addr); - if (start >= vma->vm_end) + range.start = max(vma->vm_start, start_addr); + if (range.start >= vma->vm_end) return -EINVAL; - end = min(vma->vm_end, end_addr); - if (end <= vma->vm_start) + range.end = min(vma->vm_end, end_addr); + if (range.end <= vma->vm_start) return -EINVAL; + mmu_notifier_range_init(&range, mm, range.start, range.end); lru_add_drain(); - tlb_gather_mmu(&tlb, mm, start, end); + tlb_gather_mmu(&tlb, mm, range.start, range.end); update_hiwater_rss(mm); - mmu_notifier_invalidate_range_start(mm, start, end); - madvise_free_page_range(&tlb, vma, start, end); - mmu_notifier_invalidate_range_end(mm, start, end); - tlb_finish_mmu(&tlb, start, end); + mmu_notifier_invalidate_range_start(&range); + madvise_free_page_range(&tlb, vma, range.start, range.end); + mmu_notifier_invalidate_range_end(&range); + tlb_finish_mmu(&tlb, range.start, range.end); return 0; } diff --git a/mm/memory.c b/mm/memory.c index 4ad2d293ddc2..b7a8bfe5f5ec 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -973,8 +973,7 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm, unsigned long next; unsigned long addr = vma->vm_start; unsigned long end = vma->vm_end; - unsigned long mmun_start; /* For mmu_notifiers */ - unsigned long mmun_end; /* For mmu_notifiers */ + struct mmu_notifier_range range; bool is_cow; int ret; @@ -1008,11 +1007,11 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm, * is_cow_mapping() returns true. */ is_cow = is_cow_mapping(vma->vm_flags); - mmun_start = addr; - mmun_end = end; - if (is_cow) - mmu_notifier_invalidate_range_start(src_mm, mmun_start, - mmun_end); + + if (is_cow) { + mmu_notifier_range_init(&range, src_mm, addr, end); + mmu_notifier_invalidate_range_start(&range); + } ret = 0; dst_pgd = pgd_offset(dst_mm, addr); @@ -1029,7 +1028,7 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm, } while (dst_pgd++, src_pgd++, addr = next, addr != end); if (is_cow) - mmu_notifier_invalidate_range_end(src_mm, mmun_start, mmun_end); + mmu_notifier_invalidate_range_end(&range); return ret; } @@ -1332,12 +1331,13 @@ void unmap_vmas(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long start_addr, unsigned long end_addr) { - struct mm_struct *mm = vma->vm_mm; + struct mmu_notifier_range range; - mmu_notifier_invalidate_range_start(mm, start_addr, end_addr); + mmu_notifier_range_init(&range, vma->vm_mm, start_addr, end_addr); + mmu_notifier_invalidate_range_start(&range); for ( ; vma && vma->vm_start < end_addr; vma = vma->vm_next) unmap_single_vma(tlb, vma, start_addr, end_addr, NULL); - mmu_notifier_invalidate_range_end(mm, start_addr, end_addr); + mmu_notifier_invalidate_range_end(&range); } /** @@ -1351,18 +1351,18 @@ void unmap_vmas(struct mmu_gather *tlb, void zap_page_range(struct vm_area_struct *vma, unsigned long start, unsigned long size) { - struct mm_struct *mm = vma->vm_mm; + struct mmu_notifier_range range; struct mmu_gather tlb; - unsigned long end = start + size; lru_add_drain(); - tlb_gather_mmu(&tlb, mm, start, end); - update_hiwater_rss(mm); - mmu_notifier_invalidate_range_start(mm, start, end); - for ( ; vma && vma->vm_start < end; vma = vma->vm_next) - unmap_single_vma(&tlb, vma, start, end, NULL); - mmu_notifier_invalidate_range_end(mm, start, end); - tlb_finish_mmu(&tlb, start, end); + mmu_notifier_range_init(&range, vma->vm_mm, start, start + size); + tlb_gather_mmu(&tlb, vma->vm_mm, start, range.end); + update_hiwater_rss(vma->vm_mm); + mmu_notifier_invalidate_range_start(&range); + for ( ; vma && vma->vm_start < range.end; vma = vma->vm_next) + unmap_single_vma(&tlb, vma, start, range.end, NULL); + mmu_notifier_invalidate_range_end(&range); + tlb_finish_mmu(&tlb, start, range.end); } /** @@ -1377,17 +1377,17 @@ void zap_page_range(struct vm_area_struct *vma, unsigned long start, static void zap_page_range_single(struct vm_area_struct *vma, unsigned long address, unsigned long size, struct zap_details *details) { - struct mm_struct *mm = vma->vm_mm; + struct mmu_notifier_range range; struct mmu_gather tlb; - unsigned long end = address + size; lru_add_drain(); - tlb_gather_mmu(&tlb, mm, address, end); - update_hiwater_rss(mm); - mmu_notifier_invalidate_range_start(mm, address, end); - unmap_single_vma(&tlb, vma, address, end, details); - mmu_notifier_invalidate_range_end(mm, address, end); - tlb_finish_mmu(&tlb, address, end); + mmu_notifier_range_init(&range, vma->vm_mm, address, address + size); + tlb_gather_mmu(&tlb, vma->vm_mm, address, range.end); + update_hiwater_rss(vma->vm_mm); + mmu_notifier_invalidate_range_start(&range); + unmap_single_vma(&tlb, vma, address, range.end, details); + mmu_notifier_invalidate_range_end(&range); + tlb_finish_mmu(&tlb, address, range.end); } /** @@ -2247,9 +2247,8 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf) struct page *new_page = NULL; pte_t entry; int page_copied = 0; - const unsigned long mmun_start = vmf->address & PAGE_MASK; - const unsigned long mmun_end = mmun_start + PAGE_SIZE; struct mem_cgroup *memcg; + struct mmu_notifier_range range; if (unlikely(anon_vma_prepare(vma))) goto oom; @@ -2272,7 +2271,9 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf) __SetPageUptodate(new_page); - mmu_notifier_invalidate_range_start(mm, mmun_start, mmun_end); + mmu_notifier_range_init(&range, mm, vmf->address & PAGE_MASK, + (vmf->address & PAGE_MASK) + PAGE_SIZE); + mmu_notifier_invalidate_range_start(&range); /* * Re-check the pte - we dropped the lock @@ -2349,7 +2350,7 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf) * No need to double call mmu_notifier->invalidate_range() callback as * the above ptep_clear_flush_notify() did already call it. */ - mmu_notifier_invalidate_range_only_end(mm, mmun_start, mmun_end); + mmu_notifier_invalidate_range_only_end(&range); if (old_page) { /* * Don't let another task, with possibly unlocked vma, @@ -4030,7 +4031,7 @@ int __pmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long address) #endif /* __PAGETABLE_PMD_FOLDED */ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address, - unsigned long *start, unsigned long *end, + struct mmu_notifier_range *range, pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp) { pgd_t *pgd; @@ -4058,10 +4059,10 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address, if (!pmdpp) goto out; - if (start && end) { - *start = address & PMD_MASK; - *end = *start + PMD_SIZE; - mmu_notifier_invalidate_range_start(mm, *start, *end); + if (range) { + mmu_notifier_range_init(range, mm, address & PMD_MASK, + (address & PMD_MASK) + PMD_SIZE); + mmu_notifier_invalidate_range_start(range); } *ptlp = pmd_lock(mm, pmd); if (pmd_huge(*pmd)) { @@ -4069,17 +4070,17 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address, return 0; } spin_unlock(*ptlp); - if (start && end) - mmu_notifier_invalidate_range_end(mm, *start, *end); + if (range) + mmu_notifier_invalidate_range_end(range); } if (pmd_none(*pmd) || unlikely(pmd_bad(*pmd))) goto out; - if (start && end) { - *start = address & PAGE_MASK; - *end = *start + PAGE_SIZE; - mmu_notifier_invalidate_range_start(mm, *start, *end); + if (range) { + range->start = address & PAGE_MASK; + range->end = range->start + PAGE_SIZE; + mmu_notifier_invalidate_range_start(range); } ptep = pte_offset_map_lock(mm, pmd, address, ptlp); if (!pte_present(*ptep)) @@ -4088,8 +4089,8 @@ static int __follow_pte_pmd(struct mm_struct *mm, unsigned long address, return 0; unlock: pte_unmap_unlock(ptep, *ptlp); - if (start && end) - mmu_notifier_invalidate_range_end(mm, *start, *end); + if (range) + mmu_notifier_invalidate_range_end(range); out: return -EINVAL; } @@ -4101,20 +4102,20 @@ static inline int follow_pte(struct mm_struct *mm, unsigned long address, /* (void) is needed to make gcc happy */ (void) __cond_lock(*ptlp, - !(res = __follow_pte_pmd(mm, address, NULL, NULL, + !(res = __follow_pte_pmd(mm, address, NULL, ptepp, NULL, ptlp))); return res; } int follow_pte_pmd(struct mm_struct *mm, unsigned long address, - unsigned long *start, unsigned long *end, - pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp) + struct mmu_notifier_range *range, + pte_t **ptepp, pmd_t **pmdpp, spinlock_t **ptlp) { int res; /* (void) is needed to make gcc happy */ (void) __cond_lock(*ptlp, - !(res = __follow_pte_pmd(mm, address, start, end, + !(res = __follow_pte_pmd(mm, address, range, ptepp, pmdpp, ptlp))); return res; } diff --git a/mm/migrate.c b/mm/migrate.c index acda06f99754..462163f5f278 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -2299,6 +2299,7 @@ next: */ static void migrate_vma_collect(struct migrate_vma *migrate) { + struct mmu_notifier_range range; struct mm_walk mm_walk; mm_walk.pmd_entry = migrate_vma_collect_pmd; @@ -2310,13 +2311,11 @@ static void migrate_vma_collect(struct migrate_vma *migrate) mm_walk.mm = migrate->vma->vm_mm; mm_walk.private = migrate; - mmu_notifier_invalidate_range_start(mm_walk.mm, - migrate->start, - migrate->end); + mmu_notifier_range_init(&range, mm_walk.mm, migrate->start, + migrate->end); + mmu_notifier_invalidate_range_start(&range); walk_page_range(migrate->start, migrate->end, &mm_walk); - mmu_notifier_invalidate_range_end(mm_walk.mm, - migrate->start, - migrate->end); + mmu_notifier_invalidate_range_end(&range); migrate->end = migrate->start + (migrate->npages << PAGE_SHIFT); } @@ -2697,9 +2696,8 @@ static void migrate_vma_pages(struct migrate_vma *migrate) { const unsigned long npages = migrate->npages; const unsigned long start = migrate->start; - struct vm_area_struct *vma = migrate->vma; - struct mm_struct *mm = vma->vm_mm; - unsigned long addr, i, mmu_start; + struct mmu_notifier_range range; + unsigned long addr, i; bool notified = false; for (i = 0, addr = start; i < npages; addr += PAGE_SIZE, i++) { @@ -2718,11 +2716,12 @@ static void migrate_vma_pages(struct migrate_vma *migrate) continue; } if (!notified) { - mmu_start = addr; notified = true; - mmu_notifier_invalidate_range_start(mm, - mmu_start, - migrate->end); + + mmu_notifier_range_init(&range, + migrate->vma->vm_mm, + addr, migrate->end); + mmu_notifier_invalidate_range_start(&range); } migrate_vma_insert_page(migrate, addr, newpage, &migrate->src[i], @@ -2763,8 +2762,7 @@ static void migrate_vma_pages(struct migrate_vma *migrate) * did already call it. */ if (notified) - mmu_notifier_invalidate_range_only_end(mm, mmu_start, - migrate->end); + mmu_notifier_invalidate_range_only_end(&range); } /* diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c index 74a7dc3d11c8..9c884abc7850 100644 --- a/mm/mmu_notifier.c +++ b/mm/mmu_notifier.c @@ -167,28 +167,20 @@ void __mmu_notifier_change_pte(struct mm_struct *mm, unsigned long address, srcu_read_unlock(&srcu, id); } -int __mmu_notifier_invalidate_range_start(struct mm_struct *mm, - unsigned long start, unsigned long end, - bool blockable) +int __mmu_notifier_invalidate_range_start(struct mmu_notifier_range *range) { - struct mmu_notifier_range _range, *range = &_range; struct mmu_notifier *mn; int ret = 0; int id; - range->blockable = blockable; - range->start = start; - range->end = end; - range->mm = mm; - id = srcu_read_lock(&srcu); - hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) { + hlist_for_each_entry_rcu(mn, &range->mm->mmu_notifier_mm->list, hlist) { if (mn->ops->invalidate_range_start) { int _ret = mn->ops->invalidate_range_start(mn, range); if (_ret) { pr_info("%pS callback failed with %d in %sblockable context.\n", - mn->ops->invalidate_range_start, _ret, - !blockable ? "non-" : ""); + mn->ops->invalidate_range_start, _ret, + !range->blockable ? "non-" : ""); ret = _ret; } } @@ -199,27 +191,14 @@ int __mmu_notifier_invalidate_range_start(struct mm_struct *mm, } EXPORT_SYMBOL_GPL(__mmu_notifier_invalidate_range_start); -void __mmu_notifier_invalidate_range_end(struct mm_struct *mm, - unsigned long start, - unsigned long end, +void __mmu_notifier_invalidate_range_end(struct mmu_notifier_range *range, bool only_end) { - struct mmu_notifier_range _range, *range = &_range; struct mmu_notifier *mn; int id; - /* - * The end call back will never be call if the start refused to go - * through because of blockable was false so here assume that we - * can block. - */ - range->blockable = true; - range->start = start; - range->end = end; - range->mm = mm; - id = srcu_read_lock(&srcu); - hlist_for_each_entry_rcu(mn, &mm->mmu_notifier_mm->list, hlist) { + hlist_for_each_entry_rcu(mn, &range->mm->mmu_notifier_mm->list, hlist) { /* * Call invalidate_range here too to avoid the need for the * subsystem of having to register an invalidate_range_end @@ -234,7 +213,9 @@ void __mmu_notifier_invalidate_range_end(struct mm_struct *mm, * already happen under page table lock. */ if (!only_end && mn->ops->invalidate_range) - mn->ops->invalidate_range(mn, mm, start, end); + mn->ops->invalidate_range(mn, range->mm, + range->start, + range->end); if (mn->ops->invalidate_range_end) mn->ops->invalidate_range_end(mn, range); } diff --git a/mm/mprotect.c b/mm/mprotect.c index 6d331620b9e5..36cb358db170 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -167,11 +167,12 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma, pgprot_t newprot, int dirty_accountable, int prot_numa) { pmd_t *pmd; - struct mm_struct *mm = vma->vm_mm; unsigned long next; unsigned long pages = 0; unsigned long nr_huge_updates = 0; - unsigned long mni_start = 0; + struct mmu_notifier_range range; + + range.start = 0; pmd = pmd_offset(pud, addr); do { @@ -183,9 +184,9 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma, goto next; /* invoke the mmu notifier if the pmd is populated */ - if (!mni_start) { - mni_start = addr; - mmu_notifier_invalidate_range_start(mm, mni_start, end); + if (!range.start) { + mmu_notifier_range_init(&range, vma->vm_mm, addr, end); + mmu_notifier_invalidate_range_start(&range); } if (is_swap_pmd(*pmd) || pmd_trans_huge(*pmd) || pmd_devmap(*pmd)) { @@ -214,8 +215,8 @@ next: cond_resched(); } while (pmd++, addr = next, addr != end); - if (mni_start) - mmu_notifier_invalidate_range_end(mm, mni_start, end); + if (range.start) + mmu_notifier_invalidate_range_end(&range); if (nr_huge_updates) count_vm_numa_events(NUMA_HUGE_PTE_UPDATES, nr_huge_updates); diff --git a/mm/mremap.c b/mm/mremap.c index 7f9f9180e401..def01d86e36f 100644 --- a/mm/mremap.c +++ b/mm/mremap.c @@ -197,16 +197,14 @@ unsigned long move_page_tables(struct vm_area_struct *vma, bool need_rmap_locks) { unsigned long extent, next, old_end; + struct mmu_notifier_range range; pmd_t *old_pmd, *new_pmd; - unsigned long mmun_start; /* For mmu_notifiers */ - unsigned long mmun_end; /* For mmu_notifiers */ old_end = old_addr + len; flush_cache_range(vma, old_addr, old_end); - mmun_start = old_addr; - mmun_end = old_end; - mmu_notifier_invalidate_range_start(vma->vm_mm, mmun_start, mmun_end); + mmu_notifier_range_init(&range, vma->vm_mm, old_addr, old_end); + mmu_notifier_invalidate_range_start(&range); for (; old_addr < old_end; old_addr += extent, new_addr += extent) { cond_resched(); @@ -247,7 +245,7 @@ unsigned long move_page_tables(struct vm_area_struct *vma, new_pmd, new_addr, need_rmap_locks); } - mmu_notifier_invalidate_range_end(vma->vm_mm, mmun_start, mmun_end); + mmu_notifier_invalidate_range_end(&range); return len + old_addr - old_end; /* how much done */ } diff --git a/mm/oom_kill.c b/mm/oom_kill.c index 5442cb12e4ed..f0e8cd9edb1a 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -528,19 +528,20 @@ bool __oom_reap_task_mm(struct mm_struct *mm) * count elevated without a good reason. */ if (vma_is_anonymous(vma) || !(vma->vm_flags & VM_SHARED)) { - const unsigned long start = vma->vm_start; - const unsigned long end = vma->vm_end; + struct mmu_notifier_range range; struct mmu_gather tlb; - tlb_gather_mmu(&tlb, mm, start, end); - if (mmu_notifier_invalidate_range_start_nonblock(mm, start, end)) { - tlb_finish_mmu(&tlb, start, end); + mmu_notifier_range_init(&range, mm, vma->vm_start, + vma->vm_end); + tlb_gather_mmu(&tlb, mm, range.start, range.end); + if (mmu_notifier_invalidate_range_start_nonblock(&range)) { + tlb_finish_mmu(&tlb, range.start, range.end); ret = false; continue; } - unmap_page_range(&tlb, vma, start, end, NULL); - mmu_notifier_invalidate_range_end(mm, start, end); - tlb_finish_mmu(&tlb, start, end); + unmap_page_range(&tlb, vma, range.start, range.end, NULL); + mmu_notifier_invalidate_range_end(&range); + tlb_finish_mmu(&tlb, range.start, range.end); } } diff --git a/mm/rmap.c b/mm/rmap.c index 85b7f9423352..c75f72f6fe0e 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -889,15 +889,17 @@ static bool page_mkclean_one(struct page *page, struct vm_area_struct *vma, .address = address, .flags = PVMW_SYNC, }; - unsigned long start = address, end; + struct mmu_notifier_range range; int *cleaned = arg; /* * We have to assume the worse case ie pmd for invalidation. Note that * the page can not be free from this function. */ - end = min(vma->vm_end, start + (PAGE_SIZE << compound_order(page))); - mmu_notifier_invalidate_range_start(vma->vm_mm, start, end); + mmu_notifier_range_init(&range, vma->vm_mm, address, + min(vma->vm_end, address + + (PAGE_SIZE << compound_order(page)))); + mmu_notifier_invalidate_range_start(&range); while (page_vma_mapped_walk(&pvmw)) { unsigned long cstart; @@ -949,7 +951,7 @@ static bool page_mkclean_one(struct page *page, struct vm_area_struct *vma, (*cleaned)++; } - mmu_notifier_invalidate_range_end(vma->vm_mm, start, end); + mmu_notifier_invalidate_range_end(&range); return true; } @@ -1345,7 +1347,7 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma, pte_t pteval; struct page *subpage; bool ret = true; - unsigned long start = address, end; + struct mmu_notifier_range range; enum ttu_flags flags = (enum ttu_flags)arg; /* munlock has nothing to gain from examining un-locked vmas */ @@ -1369,15 +1371,18 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma, * Note that the page can not be free in this function as call of * try_to_unmap() must hold a reference on the page. */ - end = min(vma->vm_end, start + (PAGE_SIZE << compound_order(page))); + mmu_notifier_range_init(&range, vma->vm_mm, vma->vm_start, + min(vma->vm_end, vma->vm_start + + (PAGE_SIZE << compound_order(page)))); if (PageHuge(page)) { /* * If sharing is possible, start and end will be adjusted * accordingly. */ - adjust_range_if_pmd_sharing_possible(vma, &start, &end); + adjust_range_if_pmd_sharing_possible(vma, &range.start, + &range.end); } - mmu_notifier_invalidate_range_start(vma->vm_mm, start, end); + mmu_notifier_invalidate_range_start(&range); while (page_vma_mapped_walk(&pvmw)) { #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION @@ -1428,9 +1433,10 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma, * we must flush them all. start/end were * already adjusted above to cover this range. */ - flush_cache_range(vma, start, end); - flush_tlb_range(vma, start, end); - mmu_notifier_invalidate_range(mm, start, end); + flush_cache_range(vma, range.start, range.end); + flush_tlb_range(vma, range.start, range.end); + mmu_notifier_invalidate_range(mm, range.start, + range.end); /* * The ref count of the PMD page was dropped @@ -1650,7 +1656,7 @@ discard: put_page(page); } - mmu_notifier_invalidate_range_end(vma->vm_mm, start, end); + mmu_notifier_invalidate_range_end(&range); return ret; } -- cgit v1.2.3-59-g8ed1b From 063a7d1d3623db31ca5d2309cab6030ebf93b72f Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Fri, 28 Dec 2018 00:39:46 -0800 Subject: mm/hmm: fix memremap.h, move dev_page_fault_t callback to hmm MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The kbuild robot reported the following on a development branch that used memremap.h in a new path: In file included from arch/m68k/include/asm/pgtable_mm.h:148:0, from arch/m68k/include/asm/pgtable.h:5, from include/linux/memremap.h:7, from drivers//dax/bus.c:3: arch/m68k/include/asm/motorola_pgtable.h: In function 'pgd_offset': >> arch/m68k/include/asm/motorola_pgtable.h:199:11: error: dereferencing pointer to incomplete type 'const struct mm_struct' return mm->pgd + pgd_index(address); ^~ The ->page_fault() callback is specific to HMM. Move it to 'struct hmm_devmem' where the unusual asm/pgtable.h dependency can be contained in include/linux/hmm.h. Longer term refactoring this dependency out of HMM is recommended, but in the meantime memremap.h remains generic. Link: http://lkml.kernel.org/r/154534090899.3120190.6652620807617715272.stgit@dwillia2-desk3.amr.corp.intel.com Fixes: 5042db43cc26 ("mm/ZONE_DEVICE: new type of ZONE_DEVICE memory...") Signed-off-by: Dan Williams Reviewed-by: "Jérôme Glisse" Cc: Logan Gunthorpe Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/hmm.h | 24 ++++++++++++++++++++++++ include/linux/memremap.h | 32 -------------------------------- kernel/memremap.c | 6 +++++- mm/hmm.c | 4 ++-- 4 files changed, 31 insertions(+), 35 deletions(-) (limited to 'kernel') diff --git a/include/linux/hmm.h b/include/linux/hmm.h index ed89fbc525d2..66f9ebbb1df3 100644 --- a/include/linux/hmm.h +++ b/include/linux/hmm.h @@ -69,6 +69,7 @@ #define LINUX_HMM_H #include +#include #if IS_ENABLED(CONFIG_HMM) @@ -486,6 +487,7 @@ struct hmm_devmem_ops { * @device: device to bind resource to * @ops: memory operations callback * @ref: per CPU refcount + * @page_fault: callback when CPU fault on an unaddressable device page * * This an helper structure for device drivers that do not wish to implement * the gory details related to hotplugging new memoy and allocating struct @@ -493,7 +495,28 @@ struct hmm_devmem_ops { * * Device drivers can directly use ZONE_DEVICE memory on their own if they * wish to do so. + * + * The page_fault() callback must migrate page back, from device memory to + * system memory, so that the CPU can access it. This might fail for various + * reasons (device issues, device have been unplugged, ...). When such error + * conditions happen, the page_fault() callback must return VM_FAULT_SIGBUS and + * set the CPU page table entry to "poisoned". + * + * Note that because memory cgroup charges are transferred to the device memory, + * this should never fail due to memory restrictions. However, allocation + * of a regular system page might still fail because we are out of memory. If + * that happens, the page_fault() callback must return VM_FAULT_OOM. + * + * The page_fault() callback can also try to migrate back multiple pages in one + * chunk, as an optimization. It must, however, prioritize the faulting address + * over all the others. */ +typedef int (*dev_page_fault_t)(struct vm_area_struct *vma, + unsigned long addr, + const struct page *page, + unsigned int flags, + pmd_t *pmdp); + struct hmm_devmem { struct completion completion; unsigned long pfn_first; @@ -503,6 +526,7 @@ struct hmm_devmem { struct dev_pagemap pagemap; const struct hmm_devmem_ops *ops; struct percpu_ref ref; + dev_page_fault_t page_fault; }; /* diff --git a/include/linux/memremap.h b/include/linux/memremap.h index 55db66b3716f..f0628660d541 100644 --- a/include/linux/memremap.h +++ b/include/linux/memremap.h @@ -4,8 +4,6 @@ #include #include -#include - struct resource; struct device; @@ -66,47 +64,18 @@ enum memory_type { }; /* - * For MEMORY_DEVICE_PRIVATE we use ZONE_DEVICE and extend it with two - * callbacks: - * page_fault() - * page_free() - * * Additional notes about MEMORY_DEVICE_PRIVATE may be found in * include/linux/hmm.h and Documentation/vm/hmm.rst. There is also a brief * explanation in include/linux/memory_hotplug.h. * - * The page_fault() callback must migrate page back, from device memory to - * system memory, so that the CPU can access it. This might fail for various - * reasons (device issues, device have been unplugged, ...). When such error - * conditions happen, the page_fault() callback must return VM_FAULT_SIGBUS and - * set the CPU page table entry to "poisoned". - * - * Note that because memory cgroup charges are transferred to the device memory, - * this should never fail due to memory restrictions. However, allocation - * of a regular system page might still fail because we are out of memory. If - * that happens, the page_fault() callback must return VM_FAULT_OOM. - * - * The page_fault() callback can also try to migrate back multiple pages in one - * chunk, as an optimization. It must, however, prioritize the faulting address - * over all the others. - * - * * The page_free() callback is called once the page refcount reaches 1 * (ZONE_DEVICE pages never reach 0 refcount unless there is a refcount bug. * This allows the device driver to implement its own memory management.) - * - * For MEMORY_DEVICE_PUBLIC only the page_free() callback matter. */ -typedef int (*dev_page_fault_t)(struct vm_area_struct *vma, - unsigned long addr, - const struct page *page, - unsigned int flags, - pmd_t *pmdp); typedef void (*dev_page_free_t)(struct page *page, void *data); /** * struct dev_pagemap - metadata for ZONE_DEVICE mappings - * @page_fault: callback when CPU fault on an unaddressable device page * @page_free: free page callback when page refcount reaches 1 * @altmap: pre-allocated/reserved memory for vmemmap allocations * @res: physical address range covered by @ref @@ -117,7 +86,6 @@ typedef void (*dev_page_free_t)(struct page *page, void *data); * @type: memory type: see MEMORY_* in memory_hotplug.h */ struct dev_pagemap { - dev_page_fault_t page_fault; dev_page_free_t page_free; struct vmem_altmap altmap; bool altmap_valid; diff --git a/kernel/memremap.c b/kernel/memremap.c index 0d5603d76c37..a856cb5ff192 100644 --- a/kernel/memremap.c +++ b/kernel/memremap.c @@ -11,6 +11,7 @@ #include #include #include +#include static DEFINE_XARRAY(pgmap_array); #define SECTION_MASK ~((1UL << PA_SECTION_SHIFT) - 1) @@ -24,6 +25,9 @@ vm_fault_t device_private_entry_fault(struct vm_area_struct *vma, pmd_t *pmdp) { struct page *page = device_private_entry_to_page(entry); + struct hmm_devmem *devmem; + + devmem = container_of(page->pgmap, typeof(*devmem), pagemap); /* * The page_fault() callback must migrate page back to system memory @@ -39,7 +43,7 @@ vm_fault_t device_private_entry_fault(struct vm_area_struct *vma, * There is a more in-depth description of what that callback can and * cannot do, in include/linux/memremap.h */ - return page->pgmap->page_fault(vma, addr, page, flags, pmdp); + return devmem->page_fault(vma, addr, page, flags, pmdp); } EXPORT_SYMBOL(device_private_entry_fault); #endif /* CONFIG_DEVICE_PRIVATE */ diff --git a/mm/hmm.c b/mm/hmm.c index 789587731217..a04e4b810610 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -1087,10 +1087,10 @@ struct hmm_devmem *hmm_devmem_add(const struct hmm_devmem_ops *ops, devmem->pfn_first = devmem->resource->start >> PAGE_SHIFT; devmem->pfn_last = devmem->pfn_first + (resource_size(devmem->resource) >> PAGE_SHIFT); + devmem->page_fault = hmm_devmem_fault; devmem->pagemap.type = MEMORY_DEVICE_PRIVATE; devmem->pagemap.res = *devmem->resource; - devmem->pagemap.page_fault = hmm_devmem_fault; devmem->pagemap.page_free = hmm_devmem_free; devmem->pagemap.altmap_valid = false; devmem->pagemap.ref = &devmem->ref; @@ -1141,10 +1141,10 @@ struct hmm_devmem *hmm_devmem_add_resource(const struct hmm_devmem_ops *ops, devmem->pfn_first = devmem->resource->start >> PAGE_SHIFT; devmem->pfn_last = devmem->pfn_first + (resource_size(devmem->resource) >> PAGE_SHIFT); + devmem->page_fault = hmm_devmem_fault; devmem->pagemap.type = MEMORY_DEVICE_PUBLIC; devmem->pagemap.res = *devmem->resource; - devmem->pagemap.page_fault = hmm_devmem_fault; devmem->pagemap.page_free = hmm_devmem_free; devmem->pagemap.altmap_valid = false; devmem->pagemap.ref = &devmem->ref; -- cgit v1.2.3-59-g8ed1b From 0f4991e8fd48987ae476a92cdee6bfec4aff31b8 Mon Sep 17 00:00:00 2001 From: YueHaibing Date: Fri, 28 Dec 2018 00:40:00 -0800 Subject: kernel/fork.c: mark 'stack_vm_area' with __maybe_unused Fixes gcc '-Wunused-but-set-variable' warning when CONFIG_VMAP_STACK is not set: kernel/fork.c: In function 'dup_task_struct': kernel/fork.c:843:20: warning: variable 'stack_vm_area' set but not used [-Wunused-but-set-variable] Link: http://lkml.kernel.org/r/1545965190-2381-1-git-send-email-yuehaibing@huawei.com Signed-off-by: YueHaibing Reviewed-by: Andrew Morton Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/fork.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'kernel') diff --git a/kernel/fork.c b/kernel/fork.c index c979605fe806..d439c48ecf18 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -841,7 +841,7 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node) { struct task_struct *tsk; unsigned long *stack; - struct vm_struct *stack_vm_area; + struct vm_struct *stack_vm_area __maybe_unused; int err; if (node == NUMA_NO_NODE) -- cgit v1.2.3-59-g8ed1b