linux-kernel - [patch 05/13] mm: memcontrol: retry reclaim for oom-disabled and __GFP

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Message-Id: <1403124045-24361-6-git-send-email-hannes@cmpxchg.org>
Date:	Wed, 18 Jun 2014 16:40:37 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Michal Hocko <mhocko@...e.cz>, Hugh Dickins <hughd@...gle.com>,
	Tejun Heo <tj@...nel.org>,
	Vladimir Davydov <vdavydov@...allels.com>, linux-mm@...ck.org,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [patch 05/13] 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@...xchg.org>
Acked-by: Michal Hocko <mhocko@...e.cz>
---
 mm/memcontrol.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 16f0206696ce..9c646b9b56f4 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))
-- 
2.0.0

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