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From: Johannes Weiner <hannes@cmpxchg.org>
To: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
        Huang Ying <ying.huang@intel.com>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Dave Chinner <david@fromorbit.com>, Michal Hocko <mhocko@suse.cz>,
        "Theodore Ts'o" <tytso@mit.edu>
Subject: [patch 01/12] mm: oom_kill: remove unnecessary locking in oom_enable()
Date: Wed, 25 Mar 2015 02:17:05 -0400
Message-Id: <1427264236-17249-2-git-send-email-hannes@cmpxchg.org>
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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@cmpxchg.org>
---
 mm/oom_kill.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 2b665da1b3c9..73763e489e86 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))
-- 
2.3.3


From mboxrd@z Thu Jan  1 00:00:00 1970
From: Johannes Weiner <hannes@cmpxchg.org>
Subject: [patch 01/12] mm: oom_kill: remove unnecessary locking in oom_enable()
Date: Wed, 25 Mar 2015 02:17:05 -0400
Message-ID: <1427264236-17249-2-git-send-email-hannes@cmpxchg.org>
References: <1427264236-17249-1-git-send-email-hannes@cmpxchg.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
	Huang Ying <ying.huang@intel.com>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Dave Chinner <david@fromorbit.com>,
	Michal Hocko <mhocko@suse.cz>,
	Theodore Ts'o <tytso@mit.edu>
To: linux-mm@kvack.org,
	linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org
Return-path: <owner-linux-mm@kvack.org>
In-Reply-To: <1427264236-17249-1-git-send-email-hannes@cmpxchg.org>
Sender: owner-linux-mm@kvack.org
List-Id: linux-fsdevel.vger.kernel.org

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@cmpxchg.org>
---
 mm/oom_kill.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 2b665da1b3c9..73763e489e86 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))
-- 
2.3.3

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