aboutsummaryrefslogtreecommitdiff
path: root/mm
diff options
context:
space:
mode:
authorDaisuke Nishimura <nishimura@mxp.nes.nec.co.jp>2009-01-15 13:51:14 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-15 16:39:39 -0800
commit4d1c627389c8ba6d9e703208567ffcdbd356f682 (patch)
tree535720830c6f547e2d544d1dd02d23bae41da45e /mm
parentc268e9946d7dc30ac4e55cdc3f43c8af1ae8153c (diff)
downloadlinux-2.6.38-lt-ux500-4d1c627389c8ba6d9e703208567ffcdbd356f682.tar.gz
memcg: make oom less frequently
In previous implementation, mem_cgroup_try_charge checked the return value of mem_cgroup_try_to_free_pages, and just retried if some pages had been reclaimed. But now, try_charge(and mem_cgroup_hierarchical_reclaim called from it) only checks whether the usage is less than the limit. This patch tries to change the behavior as before to cause oom less frequently. Signed-off-by: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Li Zefan <lizf@cn.fujitsu.com> Cc: Paul Menage <menage@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 322625f551c..fb62b4335fa 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -773,10 +773,10 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
* but there might be left over accounting, even after children
* have left.
*/
- ret = try_to_free_mem_cgroup_pages(root_mem, gfp_mask, noswap,
+ ret += try_to_free_mem_cgroup_pages(root_mem, gfp_mask, noswap,
get_swappiness(root_mem));
if (mem_cgroup_check_under_limit(root_mem))
- return 0;
+ return 1; /* indicate reclaim has succeeded */
if (!root_mem->use_hierarchy)
return ret;
@@ -787,10 +787,10 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
next_mem = mem_cgroup_get_next_node(root_mem);
continue;
}
- ret = try_to_free_mem_cgroup_pages(next_mem, gfp_mask, noswap,
+ ret += try_to_free_mem_cgroup_pages(next_mem, gfp_mask, noswap,
get_swappiness(next_mem));
if (mem_cgroup_check_under_limit(root_mem))
- return 0;
+ return 1; /* indicate reclaim has succeeded */
next_mem = mem_cgroup_get_next_node(root_mem);
}
return ret;
@@ -875,6 +875,8 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
ret = mem_cgroup_hierarchical_reclaim(mem_over_limit, gfp_mask,
noswap);
+ if (ret)
+ continue;
/*
* try_to_free_mem_cgroup_pages() might not give us a full