The patch titled
memcg: make oom less frequently
has been added to the -mm tree. Its filename is
memcg-make-oom-less-frequently.patch
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------------------------------------------------------
Subject: memcg: make oom less frequently
From: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxxxx>
Acked-by: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Pavel Emelyanov <xemul@xxxxxxxxxx>
Cc: Li Zefan <lizf@xxxxxxxxxxxxxx>
Cc: Paul Menage <menage@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff -puN mm/memcontrol.c~memcg-make-oom-less-frequently mm/memcontrol.c
--- a/mm/memcontrol.c~memcg-make-oom-less-frequently
+++ a/mm/memcontrol.c
@@ -773,10 +773,10 @@ static int mem_cgroup_hierarchical_recla
* 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_recla
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(struc
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
_
Patches currently in -mm which might be from nishimura@xxxxxxxxxxxxxxxxx are
memcg-fix-mem_cgroup_get_reclaim_stat_from_page.patch
memcg-fix-error-path-of-mem_cgroup_move_parent.patch
memcg-fix-hierarchical-reclaim.patch
memcg-make-oom-less-frequently.patch
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