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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 11/12] mm: page_alloc: do not lock up GFP_NOFS allocations upon OOM
Date: Wed, 25 Mar 2015 02:17:15 -0400	[thread overview]
Message-ID: <1427264236-17249-12-git-send-email-hannes@cmpxchg.org> (raw)
In-Reply-To: <1427264236-17249-1-git-send-email-hannes@cmpxchg.org>

GFP_NOFS allocations are not allowed to invoke the OOM killer since
their reclaim abilities are severely diminished.  However, without the
OOM killer available there is no hope of progress once the reclaimable
pages have been exhausted.

Don't risk hanging these allocations.  Leave it to the allocation site
to implement the fallback policy for failing allocations.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---
 mm/page_alloc.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 832ad1c7cd4f..9e45e97aa934 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2367,15 +2367,8 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order, int alloc_flags,
 		if (ac->high_zoneidx < ZONE_NORMAL)
 			goto out;
 		/* The OOM killer does not compensate for IO-less reclaim */
-		if (!(gfp_mask & __GFP_FS)) {
-			/*
-			 * XXX: Page reclaim didn't yield anything,
-			 * and the OOM killer can't be invoked, but
-			 * keep looping as per tradition.
-			 */
-			*did_some_progress = 1;
+		if (!(gfp_mask & __GFP_FS))
 			goto out;
-		}
 		if (pm_suspended_storage())
 			goto out;
 		/* The OOM killer may not free memory on a specific node */
-- 
2.3.3


WARNING: multiple messages have this Message-ID
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 11/12] mm: page_alloc: do not lock up GFP_NOFS allocations upon OOM
Date: Wed, 25 Mar 2015 02:17:15 -0400	[thread overview]
Message-ID: <1427264236-17249-12-git-send-email-hannes@cmpxchg.org> (raw)
In-Reply-To: <1427264236-17249-1-git-send-email-hannes@cmpxchg.org>

GFP_NOFS allocations are not allowed to invoke the OOM killer since
their reclaim abilities are severely diminished.  However, without the
OOM killer available there is no hope of progress once the reclaimable
pages have been exhausted.

Don't risk hanging these allocations.  Leave it to the allocation site
to implement the fallback policy for failing allocations.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
---
 mm/page_alloc.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 832ad1c7cd4f..9e45e97aa934 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2367,15 +2367,8 @@ __alloc_pages_may_oom(gfp_t gfp_mask, unsigned int order, int alloc_flags,
 		if (ac->high_zoneidx < ZONE_NORMAL)
 			goto out;
 		/* The OOM killer does not compensate for IO-less reclaim */
-		if (!(gfp_mask & __GFP_FS)) {
-			/*
-			 * XXX: Page reclaim didn't yield anything,
-			 * and the OOM killer can't be invoked, but
-			 * keep looping as per tradition.
-			 */
-			*did_some_progress = 1;
+		if (!(gfp_mask & __GFP_FS))
 			goto out;
-		}
 		if (pm_suspended_storage())
 			goto out;
 		/* The OOM killer may not free memory on a specific node */
-- 
2.3.3

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  parent reply	other threads:[~2015-03-25  6:17 UTC|newest]

Thread overview: 138+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-25  6:17 [patch 00/12] mm: page_alloc: improve OOM mechanism and policy Johannes Weiner
2015-03-25  6:17 ` [patch 01/12] mm: oom_kill: remove unnecessary locking in oom_enable() Johannes Weiner
2015-03-26  0:51   ` David Rientjes
2015-03-26 11:51     ` Michal Hocko
2015-03-26 13:18       ` Michal Hocko
2015-03-26 19:30         ` David Rientjes
2015-03-26 11:43   ` Michal Hocko
2015-03-26 20:05   ` David Rientjes
2015-03-25  6:17 ` [patch 02/12] mm: oom_kill: clean up victim marking and exiting interfaces Johannes Weiner
2015-03-26  3:34   ` David Rientjes
2015-03-26 11:54   ` Michal Hocko
2015-03-25  6:17 ` [patch 03/12] mm: oom_kill: switch test-and-clear of known TIF_MEMDIE to clear Johannes Weiner
2015-03-26  3:31   ` David Rientjes
2015-03-26 11:05     ` Johannes Weiner
2015-03-26 19:50       ` David Rientjes
2015-03-30 14:48         ` Michal Hocko
2015-04-02 23:01         ` [patch] android, lmk: avoid setting TIF_MEMDIE if process has already exited David Rientjes
2015-04-28 22:50           ` [patch resend] " David Rientjes
2015-03-26 11:57   ` [patch 03/12] mm: oom_kill: switch test-and-clear of known TIF_MEMDIE to clear Michal Hocko
2015-03-25  6:17 ` [patch 04/12] mm: oom_kill: remove unnecessary locking in exit_oom_victim() Johannes Weiner
2015-03-26 12:53   ` Michal Hocko
2015-03-26 13:01     ` Michal Hocko
2015-03-26 15:10       ` Johannes Weiner
2015-03-26 15:04     ` Johannes Weiner
2015-03-25  6:17 ` [patch 05/12] mm: oom_kill: generalize OOM progress waitqueue Johannes Weiner
2015-03-26 13:03   ` Michal Hocko
2015-03-25  6:17 ` [patch 06/12] mm: oom_kill: simplify OOM killer locking Johannes Weiner
2015-03-26 13:31   ` Michal Hocko
2015-03-26 15:17     ` Johannes Weiner
2015-03-26 16:07       ` Michal Hocko
2015-03-25  6:17 ` [patch 07/12] mm: page_alloc: inline should_alloc_retry() Johannes Weiner
2015-03-26 14:11   ` Michal Hocko
2015-03-26 15:18     ` Johannes Weiner
2015-03-25  6:17 ` [patch 08/12] mm: page_alloc: wait for OOM killer progress before retrying Johannes Weiner
2015-03-25 14:15   ` Tetsuo Handa
2015-03-25 17:01     ` Vlastimil Babka
2015-03-26 11:28       ` Johannes Weiner
2015-03-26 11:24     ` Johannes Weiner
2015-03-26 14:32       ` Michal Hocko
2015-03-26 15:23         ` Johannes Weiner
2015-03-26 15:38           ` Michal Hocko
2015-03-26 18:17             ` Johannes Weiner
2015-03-27 14:01             ` [patch 08/12] mm: page_alloc: wait for OOM killer progressbefore retrying Tetsuo Handa
2015-03-26 15:58   ` [patch 08/12] mm: page_alloc: wait for OOM killer progress before retrying Michal Hocko
2015-03-26 18:23     ` Johannes Weiner
2015-03-25  6:17 ` [patch 09/12] mm: page_alloc: private memory reserves for OOM-killing allocations Johannes Weiner
2015-04-14 16:49   ` Michal Hocko
2015-04-24 19:13     ` Johannes Weiner
2015-03-25  6:17 ` [patch 10/12] mm: page_alloc: emergency reserve access for __GFP_NOFAIL allocations Johannes Weiner
2015-04-14 16:55   ` Michal Hocko
2015-03-25  6:17 ` Johannes Weiner [this message]
2015-03-26 14:50   ` [patch 11/12] mm: page_alloc: do not lock up GFP_NOFS allocations upon OOM Michal Hocko
2015-03-25  6:17 ` [patch 12/12] mm: page_alloc: do not lock up low-order " Johannes Weiner
2015-03-26 15:32   ` Michal Hocko
2015-03-26 19:58 ` [patch 00/12] mm: page_alloc: improve OOM mechanism and policy Dave Chinner
2015-03-27 15:05   ` Johannes Weiner
2015-03-30  0:32     ` Dave Chinner
2015-03-30 19:31       ` Johannes Weiner
2015-04-01 15:19       ` Michal Hocko
2015-04-01 21:39         ` Dave Chinner
2015-04-02  7:29           ` Michal Hocko
2015-04-07 14:18         ` Johannes Weiner
2015-04-11  7:29           ` Tetsuo Handa
2015-04-13 12:49             ` Michal Hocko
2015-04-13 12:46           ` Michal Hocko
2015-04-14  0:11             ` Dave Chinner
2015-04-14  7:20               ` Michal Hocko
2015-04-14 10:36             ` Johannes Weiner
2015-04-14 14:23               ` Michal Hocko

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