diff options
| -rw-r--r-- | init/Kconfig | 17 | ||||
| -rw-r--r-- | mm/memcontrol.c | 53 | ||||
| -rw-r--r-- | mm/swap_cgroup.c | 6 |
3 files changed, 24 insertions, 52 deletions
diff --git a/init/Kconfig b/init/Kconfig index 74a5ac65644f..ff5a827303dd 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -819,24 +819,9 @@ config MEMCG Provides control over the memory footprint of tasks in a cgroup. config MEMCG_SWAP - bool "Swap controller" + bool depends on MEMCG && SWAP - help - Provides control over the swap space consumed by tasks in a cgroup. - -config MEMCG_SWAP_ENABLED - bool "Swap controller enabled by default" - depends on MEMCG_SWAP default y - help - Memory Resource Controller Swap Extension comes with its price in - a bigger memory consumption. General purpose distribution kernels - which want to enable the feature but keep it disabled by default - and let the user enable it by swapaccount=1 boot command line - parameter should have this option unselected. - For those who want to have the feature enabled by default should - select this option (if, for some reason, they need to disable it - then swapaccount=0 does the trick). config MEMCG_KMEM bool diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 2d035e68a127..425a265dc2a0 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -83,14 +83,10 @@ static bool cgroup_memory_nokmem; /* Whether the swap controller is active */ #ifdef CONFIG_MEMCG_SWAP -#ifdef CONFIG_MEMCG_SWAP_ENABLED bool cgroup_memory_noswap __read_mostly; #else -bool cgroup_memory_noswap __read_mostly = 1; -#endif /* CONFIG_MEMCG_SWAP_ENABLED */ -#else #define cgroup_memory_noswap 1 -#endif /* CONFIG_MEMCG_SWAP */ +#endif #ifdef CONFIG_CGROUP_WRITEBACK static DECLARE_WAIT_QUEUE_HEAD(memcg_cgwb_frn_waitq); @@ -5360,8 +5356,7 @@ static struct page *mc_handle_swap_pte(struct vm_area_struct *vma, * we call find_get_page() with swapper_space directly. */ page = find_get_page(swap_address_space(ent), swp_offset(ent)); - if (do_memsw_account()) - entry->val = ent.val; + entry->val = ent.val; return page; } @@ -5395,8 +5390,7 @@ static struct page *mc_handle_file_pte(struct vm_area_struct *vma, page = find_get_entry(mapping, pgoff); if (xa_is_value(page)) { swp_entry_t swp = radix_to_swp_entry(page); - if (do_memsw_account()) - *entry = swp; + *entry = swp; page = find_get_page(swap_address_space(swp), swp_offset(swp)); } @@ -6529,6 +6523,9 @@ int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask, goto out; if (PageSwapCache(page)) { + swp_entry_t ent = { .val = page_private(page), }; + unsigned short id; + /* * Every swap fault against a single page tries to charge the * page, bail as early as possible. shmem_unuse() encounters @@ -6540,17 +6537,12 @@ int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask, if (compound_head(page)->mem_cgroup) goto out; - if (!cgroup_memory_noswap) { - swp_entry_t ent = { .val = page_private(page), }; - unsigned short id; - - id = lookup_swap_cgroup_id(ent); - rcu_read_lock(); - memcg = mem_cgroup_from_id(id); - if (memcg && !css_tryget_online(&memcg->css)) - memcg = NULL; - rcu_read_unlock(); - } + id = lookup_swap_cgroup_id(ent); + rcu_read_lock(); + memcg = mem_cgroup_from_id(id); + if (memcg && !css_tryget_online(&memcg->css)) + memcg = NULL; + rcu_read_unlock(); } if (!memcg) @@ -6567,7 +6559,7 @@ int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask, memcg_check_events(memcg, page); local_irq_enable(); - if (do_memsw_account() && PageSwapCache(page)) { + if (PageSwapCache(page)) { swp_entry_t entry = { .val = page_private(page) }; /* * The swap entry might not get freed for a long time, @@ -6952,7 +6944,7 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry) VM_BUG_ON_PAGE(PageLRU(page), page); VM_BUG_ON_PAGE(page_count(page), page); - if (!do_memsw_account()) + if (cgroup_subsys_on_dfl(memory_cgrp_subsys)) return; memcg = page->mem_cgroup; @@ -6981,7 +6973,7 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry) if (!mem_cgroup_is_root(memcg)) page_counter_uncharge(&memcg->memory, nr_entries); - if (memcg != swap_memcg) { + if (!cgroup_memory_noswap && memcg != swap_memcg) { if (!mem_cgroup_is_root(swap_memcg)) page_counter_charge(&swap_memcg->memsw, nr_entries); page_counter_uncharge(&memcg->memsw, nr_entries); @@ -7017,7 +7009,7 @@ int mem_cgroup_try_charge_swap(struct page *page, swp_entry_t entry) struct mem_cgroup *memcg; unsigned short oldid; - if (!cgroup_subsys_on_dfl(memory_cgrp_subsys) || cgroup_memory_noswap) + if (!cgroup_subsys_on_dfl(memory_cgrp_subsys)) return 0; memcg = page->mem_cgroup; @@ -7033,7 +7025,7 @@ int mem_cgroup_try_charge_swap(struct page *page, swp_entry_t entry) memcg = mem_cgroup_id_get_online(memcg); - if (!mem_cgroup_is_root(memcg) && + if (!cgroup_memory_noswap && !mem_cgroup_is_root(memcg) && !page_counter_try_charge(&memcg->swap, nr_pages, &counter)) { memcg_memory_event(memcg, MEMCG_SWAP_MAX); memcg_memory_event(memcg, MEMCG_SWAP_FAIL); @@ -7061,14 +7053,11 @@ void mem_cgroup_uncharge_swap(swp_entry_t entry, unsigned int nr_pages) struct mem_cgroup *memcg; unsigned short id; - if (cgroup_memory_noswap) - return; - id = swap_cgroup_record(entry, 0, nr_pages); rcu_read_lock(); memcg = mem_cgroup_from_id(id); if (memcg) { - if (!mem_cgroup_is_root(memcg)) { + if (!cgroup_memory_noswap && !mem_cgroup_is_root(memcg)) { if (cgroup_subsys_on_dfl(memory_cgrp_subsys)) page_counter_uncharge(&memcg->swap, nr_pages); else @@ -7253,7 +7242,11 @@ static struct cftype memsw_files[] = { static int __init mem_cgroup_swap_init(void) { - if (mem_cgroup_disabled() || cgroup_memory_noswap) + /* No memory control -> no swap control */ + if (mem_cgroup_disabled()) + cgroup_memory_noswap = true; + + if (cgroup_memory_noswap) return 0; WARN_ON(cgroup_add_dfl_cftypes(&memory_cgrp_subsys, swap_files)); diff --git a/mm/swap_cgroup.c b/mm/swap_cgroup.c index 7aa764f09079..7f34343c075a 100644 --- a/mm/swap_cgroup.c +++ b/mm/swap_cgroup.c @@ -171,9 +171,6 @@ int swap_cgroup_swapon(int type, unsigned long max_pages) unsigned long length; struct swap_cgroup_ctrl *ctrl; - if (cgroup_memory_noswap) - return 0; - length = DIV_ROUND_UP(max_pages, SC_PER_PAGE); array_size = length * sizeof(void *); @@ -209,9 +206,6 @@ void swap_cgroup_swapoff(int type) unsigned long i, length; struct swap_cgroup_ctrl *ctrl; - if (cgroup_memory_noswap) - return; - mutex_lock(&swap_cgroup_mutex); ctrl = &swap_cgroup_ctrl[type]; map = ctrl->map; |