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Subject[PATCH 4/4] 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.

ChangeLog: RFC->v1
- removed RETRIES_MAX.

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>
---
mm/memcontrol.c | 10 ++++++----
1 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 322625f..fb62b43 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

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