[Devel] [PATCH rh7 09/21] ms/mm: memcontrol: reclaim at least once for __GFP_NORETRY

[Andrey Ryabinin]

From: Johannes Weiner <hannes at cmpxchg.org>

Currently, __GFP_NORETRY tries charging once and gives up before even
trying to reclaim.  Bring the behavior on par with the page allocator
and reclaim at least once before giving up.

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

https://jira.sw.ru/browse/PSBM-51558
(cherry picked from commit 28c34c291e746aab1c2bfd6d6609b2e47fa0978b)
Signed-off-by: Andrey Ryabinin <aryabinin at virtuozzo.com>
---
 mm/memcontrol.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index fed3451..fe25cde 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2798,13 +2798,13 @@ retry:
 	if (!(gfp_mask & __GFP_WAIT))
 		goto nomem;
 
-	if (gfp_mask & __GFP_NORETRY)
-		goto nomem;
-
 	nr_reclaimed = mem_cgroup_reclaim(mem_over_limit, gfp_mask, flags);
 
 	if (mem_cgroup_margin(mem_over_limit) >= batch)
 		goto retry;
+
+	if (gfp_mask & __GFP_NORETRY)
+		goto nomem;
 	/*
 	 * Even though the limit is exceeded at this point, reclaim
 	 * may have been able to free some pages.  Retry the charge
-- 
2.7.3