linux-kernel - [PATCH] mm: zap ZONE_OOM

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Date:	Fri, 27 May 2016 17:08:13 +0300
From:	Vladimir Davydov <vdavydov@...tuozzo.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Michal Hocko <mhocko@...nel.org>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] mm: zap ZONE_OOM_LOCKED

Not used since oom_lock was instroduced.

Signed-off-by: Vladimir Davydov <vdavydov@...tuozzo.com>
---
 include/linux/mmzone.h | 1 -
 mm/oom_kill.c          | 4 ++--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 02069c23486d..3388ccbab7d6 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -524,7 +524,6 @@ struct zone {
 
 enum zone_flags {
 	ZONE_RECLAIM_LOCKED,		/* prevents concurrent reclaim */
-	ZONE_OOM_LOCKED,		/* zone is in OOM killer zonelist */
 	ZONE_CONGESTED,			/* zone has many dirty pages backed by
 					 * a congested BDI
 					 */
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 1685890d424e..b95c4c101b35 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -997,8 +997,8 @@ bool out_of_memory(struct oom_control *oc)
 
 /*
  * The pagefault handler calls here because it is out of memory, so kill a
- * memory-hogging task.  If any populated zone has ZONE_OOM_LOCKED set, a
- * parallel oom killing is already in progress so do nothing.
+ * memory-hogging task. If oom_lock is held by somebody else, a parallel oom
+ * killing is already in progress so do nothing.
  */
 void pagefault_out_of_memory(void)
 {
-- 
2.1.4