From 3f58a82943337fb6e79acfa5346719a97d3c0b98 Mon Sep 17 00:00:00 2001 From: Minchan Kim Date: Tue, 22 Mar 2011 16:32:53 -0700 Subject: [PATCH] memcg: move memcg reclaimable page into tail of inactive list The rotate_reclaimable_page function moves just written out pages, which the VM wanted to reclaim, to the end of the inactive list. That way the VM will find those pages first next time it needs to free memory. This patch applies the rule in memcg. It can help to prevent unnecessary working page eviction of memcg. Signed-off-by: Minchan Kim Acked-by: Balbir Singh Acked-by: KAMEZAWA Hiroyuki Reviewed-by: Rik van Riel Cc: KOSAKI Motohiro Acked-by: Johannes Weiner Cc: Andrea Arcangeli Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/memcontrol.h | 6 ++++++ mm/memcontrol.c | 26 ++++++++++++++++++++++++++ mm/swap.c | 3 ++- 3 files changed, 34 insertions(+), 1 deletion(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index a1a1e5384f6..5bb7be2628c 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -62,6 +62,7 @@ extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask); extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru); extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru); +extern void mem_cgroup_rotate_reclaimable_page(struct page *page); extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru); extern void mem_cgroup_del_lru(struct page *page); extern void mem_cgroup_move_lists(struct page *page, @@ -211,6 +212,11 @@ static inline void mem_cgroup_del_lru_list(struct page *page, int lru) return ; } +static inline inline void mem_cgroup_rotate_reclaimable_page(struct page *page) +{ + return ; +} + static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru) { return ; diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 6ef5c53dffc..9e0f05efd11 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -829,6 +829,32 @@ void mem_cgroup_del_lru(struct page *page) mem_cgroup_del_lru_list(page, page_lru(page)); } +/* + * Writeback is about to end against a page which has been marked for immediate + * reclaim. If it still appears to be reclaimable, move it to the tail of the + * inactive list. + */ +void mem_cgroup_rotate_reclaimable_page(struct page *page) +{ + struct mem_cgroup_per_zone *mz; + struct page_cgroup *pc; + enum lru_list lru = page_lru(page); + + if (mem_cgroup_disabled()) + return; + + pc = lookup_page_cgroup(page); + /* unused or root page is not rotated. */ + if (!PageCgroupUsed(pc)) + return; + /* Ensure pc->mem_cgroup is visible after reading PCG_USED. */ + smp_rmb(); + if (mem_cgroup_is_root(pc->mem_cgroup)) + return; + mz = page_cgroup_zoneinfo(pc); + list_move_tail(&pc->lru, &mz->lists[lru]); +} + void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru) { struct mem_cgroup_per_zone *mz; diff --git a/mm/swap.c b/mm/swap.c index 4aea806d0d4..1b9e4ebaffc 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -200,8 +200,9 @@ static void pagevec_move_tail(struct pagevec *pvec) spin_lock(&zone->lru_lock); } if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) { - int lru = page_lru_base_type(page); + enum lru_list lru = page_lru_base_type(page); list_move_tail(&page->lru, &zone->lru[lru].list); + mem_cgroup_rotate_reclaimable_page(page); pgmoved++; } } -- 2.20.1