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mm, memcg: pass charge order to oom killer

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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 <rientjes@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Balbir Singh <bsingharora@gmail.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Rientjes
2012-03-21 16:34:10 -07:00
committed by Linus Torvalds
parent c7cfa37b73
commit e845e19936
3 changed files with 9 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
mm/oom_kill.c
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@ -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);
}