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| author |   Dan Williams <dan.j.williams@intel.com> | 2016-01-15 16:56:22 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@linux-foundation.org> | 2016-01-15 17:56:32 -0800 |
| commit | 4b94ffdc4163bae1ec73b6e977ffb7a7da3d06d3 (patch) | |
| tree | f653da252999e8c1f45a2c7ae18fb1c241b4a300 /mm/sparse.c | |
| parent | mm: introduce find_dev_pagemap() (diff) | |
| download | linux-dev-4b94ffdc4163bae1ec73b6e977ffb7a7da3d06d3.tar.xz linux-dev-4b94ffdc4163bae1ec73b6e977ffb7a7da3d06d3.zip | |
x86, mm: introduce vmem_altmap to augment vmemmap_populate()
In support of providing struct page for large persistent memory
capacities, use struct vmem_altmap to change the default policy for
allocating memory for the memmap array. The default vmemmap_populate()
allocates page table storage area from the page allocator. Given
persistent memory capacities relative to DRAM it may not be feasible to
store the memmap in 'System Memory'. Instead vmem_altmap represents
pre-allocated "device pages" to satisfy vmemmap_alloc_block_buf()
requests.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reported-by: kbuild test robot <lkp@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/sparse.c')
| -rw-r--r-- | mm/sparse.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/mm/sparse.c b/mm/sparse.c index d1b48b691ac8..3717ceed4177 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -748,7 +748,7 @@ static void clear_hwpoisoned_pages(struct page *memmap, int nr_pages) if (!memmap) return; - for (i = 0; i < PAGES_PER_SECTION; i++) { + for (i = 0; i < nr_pages; i++) { if (PageHWPoison(&memmap[i])) { atomic_long_sub(1, &num_poisoned_pages); ClearPageHWPoison(&memmap[i]); @@ -788,7 +788,8 @@ static void free_section_usemap(struct page *memmap, unsigned long *usemap) free_map_bootmem(memmap); } -void sparse_remove_one_section(struct zone *zone, struct mem_section *ms) +void sparse_remove_one_section(struct zone *zone, struct mem_section *ms, + unsigned long map_offset) { struct page *memmap = NULL; unsigned long *usemap = NULL, flags; @@ -804,7 +805,8 @@ void sparse_remove_one_section(struct zone *zone, struct mem_section *ms) } pgdat_resize_unlock(pgdat, &flags); - clear_hwpoisoned_pages(memmap, PAGES_PER_SECTION); + clear_hwpoisoned_pages(memmap + map_offset, + PAGES_PER_SECTION - map_offset); free_section_usemap(memmap, usemap); } #endif /* CONFIG_MEMORY_HOTREMOVE */ |