From: Johannes Weiner <hannes@cmpxchg.org>
Date: Wed, 6 Aug 2014 23:05:51 +0000 (-0700)
Subject: mm: memcontrol: retry reclaim for oom-disabled and __GFP_NOFAIL charges
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=9b1306192d335759a6cf2f3b404c49e811e5f953;p=openwrt%2Fstaging%2Fblogic.git

mm: memcontrol: retry reclaim for oom-disabled and __GFP_NOFAIL charges

There is no reason why oom-disabled and __GFP_NOFAIL charges should try
to reclaim only once when every other charge tries several times before
giving up.  Make them all retry the same number of times.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.cz>
Cc: Hugh Dickins <hughd@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Vladimir Davydov <vdavydov@parallels.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index a73f3947f5d9..3069d6420b0e 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2566,7 +2566,7 @@ static int mem_cgroup_try_charge(struct mem_cgroup *memcg,
 				 bool oom)
 {
 	unsigned int batch = max(CHARGE_BATCH, nr_pages);
-	int nr_oom_retries = MEM_CGROUP_RECLAIM_RETRIES;
+	int nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
 	struct mem_cgroup *mem_over_limit;
 	struct res_counter *fail_res;
 	unsigned long nr_reclaimed;
@@ -2638,6 +2638,9 @@ retry:
 	if (mem_cgroup_wait_acct_move(mem_over_limit))
 		goto retry;
 
+	if (nr_retries--)
+		goto retry;
+
 	if (gfp_mask & __GFP_NOFAIL)
 		goto bypass;
 
@@ -2647,9 +2650,6 @@ retry:
 	if (!oom)
 		goto nomem;
 
-	if (nr_oom_retries--)
-		goto retry;
-
 	mem_cgroup_oom(mem_over_limit, gfp_mask, get_order(batch));
 nomem:
 	if (!(gfp_mask & __GFP_NOFAIL))