linux-kernel - [PATCH 1/9] mm: oom_kill: remove unnecessary locking in oom

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Date:	Mon, 27 Apr 2015 15:05:47 -0400
From:	Johannes Weiner <hannes@...xchg.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Michal Hocko <mhocko@...e.cz>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Dave Chinner <david@...morbit.com>,
	David Rientjes <rientjes@...gle.com>,
	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/9] mm: oom_kill: remove unnecessary locking in oom_enable()

Setting oom_killer_disabled to false is atomic, there is no need for
further synchronization with ongoing allocations trying to OOM-kill.

Signed-off-by: Johannes Weiner <hannes@...xchg.org>
Acked-by: Michal Hocko <mhocko@...e.cz>
Acked-by: David Rientjes <rientjes@...gle.com>
---
 mm/oom_kill.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 2b665da..73763e4 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -488,9 +488,7 @@ bool oom_killer_disable(void)
  */
 void oom_killer_enable(void)
 {
-	down_write(&oom_sem);
 	oom_killer_disabled = false;
-	up_write(&oom_sem);
 }
 
 #define K(x) ((x) << (PAGE_SHIFT-10))
-- 
2.3.4

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