From e845e199362cc5712ba0e7eedc14eed70e144258 Mon Sep 17 00:00:00 2001 From: David Rientjes Date: Wed, 21 Mar 2012 16:34:10 -0700 Subject: [PATCH] mm, memcg: pass charge order to oom killer The oom killer typically displays the allocation order at the time of oom as a part of its diangostic messages (for global, cpuset, and mempolicy ooms). The memory controller may also pass the charge order to the oom killer so it can emit the same information. This is useful in determining how large the memory allocation is that triggered the oom killer. Signed-off-by: David Rientjes Cc: Johannes Weiner Cc: Michal Hocko Cc: Balbir Singh Acked-by: KAMEZAWA Hiroyuki Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/memcontrol.h | 3 ++- mm/memcontrol.c | 6 +++--- mm/oom_kill.c | 7 ++++--- 3 files changed, 9 insertions(+), 7 deletions(-) diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index b80de520670b..d90965086fae 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -77,7 +77,8 @@ extern void mem_cgroup_uncharge_end(void); extern void mem_cgroup_uncharge_page(struct page *page); extern void mem_cgroup_uncharge_cache_page(struct page *page); -extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask); +extern void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask, + int order); int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *memcg); extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page); diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 37281816ff67..bb04067269bc 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1811,7 +1811,7 @@ static void memcg_oom_recover(struct mem_cgroup *memcg) /* * try to call OOM killer. returns false if we should exit memory-reclaim loop. */ -bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask) +bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask, int order) { struct oom_wait_info owait; bool locked, need_to_kill; @@ -1841,7 +1841,7 @@ bool mem_cgroup_handle_oom(struct mem_cgroup *memcg, gfp_t mask) if (need_to_kill) { finish_wait(&memcg_oom_waitq, &owait.wait); - mem_cgroup_out_of_memory(memcg, mask); + mem_cgroup_out_of_memory(memcg, mask, order); } else { schedule(); finish_wait(&memcg_oom_waitq, &owait.wait); @@ -2212,7 +2212,7 @@ static int mem_cgroup_do_charge(struct mem_cgroup *memcg, gfp_t gfp_mask, if (!oom_check) return CHARGE_NOMEM; /* check OOM */ - if (!mem_cgroup_handle_oom(mem_over_limit, gfp_mask)) + if (!mem_cgroup_handle_oom(mem_over_limit, gfp_mask, get_order(csize))) return CHARGE_OOM_DIE; return CHARGE_RETRY; diff --git a/mm/oom_kill.c b/mm/oom_kill.c index f23f33454645..4198e000f41a 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -554,7 +554,8 @@ static void check_panic_on_oom(enum oom_constraint constraint, gfp_t gfp_mask, } #ifdef CONFIG_CGROUP_MEM_RES_CTLR -void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask) +void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask, + int order) { unsigned long limit; unsigned int points = 0; @@ -570,12 +571,12 @@ void mem_cgroup_out_of_memory(struct mem_cgroup *memcg, gfp_t gfp_mask) return; } - check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, 0, NULL); + check_panic_on_oom(CONSTRAINT_MEMCG, gfp_mask, order, NULL); limit = mem_cgroup_get_limit(memcg) >> PAGE_SHIFT; read_lock(&tasklist_lock); p = select_bad_process(&points, limit, memcg, NULL, false); if (p && PTR_ERR(p) != -1UL) - oom_kill_process(p, gfp_mask, 0, points, limit, memcg, NULL, + oom_kill_process(p, gfp_mask, order, points, limit, memcg, NULL, "Memory cgroup out of memory"); read_unlock(&tasklist_lock); } -- 2.20.1