From: Christoph Hellwig <hch@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@infradead.org>, Mel Gorman <mel@csn.ul.ie>,
Dave Chinner <david@fromorbit.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Chris Mason <chris.mason@oracle.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH] mm: disallow direct reclaim page writeback
Date: Sun, 18 Apr 2010 15:35:45 -0400 [thread overview]
Message-ID: <20100418193545.GA28479@infradead.org> (raw)
In-Reply-To: <20100418123109.0953b7a5.akpm@linux-foundation.org>
On Sun, Apr 18, 2010 at 12:31:09PM -0400, Andrew Morton wrote:
> Yeah, but it's all bandaids. The first thing we should do is work out
> why writeout-off-the-LRU increased so much and fix that.
>
> Handing writeout off to separate threads might be used to solve the
> stack consumption problem but we shouldn't use it to "solve" the
> excess-writeout-from-page-reclaim problem.
I think both of them are really serious issue. Exposing the whole
stack and lock problems with direct reclaim are a bit of a positive
side-effect os the writeout tuning messup. Without it the problems
would still be just as harmfull, just happenening even less often and
thus getting even less attention.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Christoph Hellwig <hch@infradead.org>, Mel Gorman <mel@csn.ul.ie>,
Dave Chinner <david@fromorbit.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Chris Mason <chris.mason@oracle.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH] mm: disallow direct reclaim page writeback
Date: Sun, 18 Apr 2010 15:35:45 -0400 [thread overview]
Message-ID: <20100418193545.GA28479@infradead.org> (raw)
In-Reply-To: <20100418123109.0953b7a5.akpm@linux-foundation.org>
On Sun, Apr 18, 2010 at 12:31:09PM -0400, Andrew Morton wrote:
> Yeah, but it's all bandaids. The first thing we should do is work out
> why writeout-off-the-LRU increased so much and fix that.
>
> Handing writeout off to separate threads might be used to solve the
> stack consumption problem but we shouldn't use it to "solve" the
> excess-writeout-from-page-reclaim problem.
I think both of them are really serious issue. Exposing the whole
stack and lock problems with direct reclaim are a bit of a positive
side-effect os the writeout tuning messup. Without it the problems
would still be just as harmfull, just happenening even less often and
thus getting even less attention.
--
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next prev parent reply other threads:[~2010-04-18 19:35 UTC|newest]
Thread overview: 248+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-13 0:17 [PATCH] mm: disallow direct reclaim page writeback Dave Chinner
2010-04-13 0:17 ` Dave Chinner
2010-04-13 8:31 ` KOSAKI Motohiro
2010-04-13 8:31 ` KOSAKI Motohiro
2010-04-13 10:29 ` Dave Chinner
2010-04-13 10:29 ` Dave Chinner
2010-04-13 11:39 ` KOSAKI Motohiro
2010-04-13 11:39 ` KOSAKI Motohiro
2010-04-13 14:36 ` Dave Chinner
2010-04-13 14:36 ` Dave Chinner
2010-04-14 3:12 ` Dave Chinner
2010-04-14 3:12 ` Dave Chinner
2010-04-14 6:52 ` KOSAKI Motohiro
2010-04-14 6:52 ` KOSAKI Motohiro
2010-04-15 1:56 ` Dave Chinner
2010-04-15 1:56 ` Dave Chinner
2010-04-14 6:52 ` KOSAKI Motohiro
2010-04-14 6:52 ` KOSAKI Motohiro
2010-04-14 7:36 ` Dave Chinner
2010-04-14 7:36 ` Dave Chinner
2010-04-13 9:58 ` Mel Gorman
2010-04-13 9:58 ` Mel Gorman
2010-04-13 11:19 ` Dave Chinner
2010-04-13 11:19 ` Dave Chinner
2010-04-13 19:34 ` Mel Gorman
2010-04-13 19:34 ` Mel Gorman
2010-04-13 20:20 ` Chris Mason
2010-04-13 20:20 ` Chris Mason
2010-04-14 1:40 ` Dave Chinner
2010-04-14 1:40 ` Dave Chinner
2010-04-14 4:59 ` KAMEZAWA Hiroyuki
2010-04-14 4:59 ` KAMEZAWA Hiroyuki
2010-04-14 5:41 ` Dave Chinner
2010-04-14 5:41 ` Dave Chinner
2010-04-14 5:54 ` KOSAKI Motohiro
2010-04-14 5:54 ` KOSAKI Motohiro
2010-04-14 6:13 ` Minchan Kim
2010-04-14 7:19 ` Minchan Kim
2010-04-14 7:19 ` Minchan Kim
2010-04-14 9:42 ` KAMEZAWA Hiroyuki
2010-04-14 9:42 ` KAMEZAWA Hiroyuki
2010-04-14 9:42 ` KAMEZAWA Hiroyuki
2010-04-14 10:01 ` Minchan Kim
2010-04-14 10:01 ` Minchan Kim
2010-04-14 10:07 ` Mel Gorman
2010-04-14 10:07 ` Mel Gorman
2010-04-14 10:07 ` Mel Gorman
2010-04-14 10:16 ` Minchan Kim
2010-04-14 10:16 ` Minchan Kim
2010-04-14 7:06 ` Dave Chinner
2010-04-14 7:06 ` Dave Chinner
2010-04-14 6:52 ` KOSAKI Motohiro
2010-04-14 6:52 ` KOSAKI Motohiro
2010-04-14 7:28 ` Dave Chinner
2010-04-14 7:28 ` Dave Chinner
2010-04-14 8:51 ` Mel Gorman
2010-04-14 8:51 ` Mel Gorman
2010-04-15 1:34 ` Dave Chinner
2010-04-15 1:34 ` Dave Chinner
2010-04-15 1:34 ` Dave Chinner
2010-04-15 4:09 ` KOSAKI Motohiro
2010-04-15 4:09 ` KOSAKI Motohiro
2010-04-15 4:11 ` [PATCH 1/4] vmscan: delegate pageout io to flusher thread if current is kswapd KOSAKI Motohiro
2010-04-15 4:11 ` KOSAKI Motohiro
2010-04-15 4:11 ` KOSAKI Motohiro
2010-04-15 8:05 ` Suleiman Souhlal
2010-04-15 8:05 ` Suleiman Souhlal
2010-04-15 8:17 ` KOSAKI Motohiro
2010-04-15 8:17 ` KOSAKI Motohiro
2010-04-15 8:26 ` KOSAKI Motohiro
2010-04-15 8:26 ` KOSAKI Motohiro
2010-04-15 10:30 ` Johannes Weiner
2010-04-15 10:30 ` Johannes Weiner
2010-04-15 17:24 ` Suleiman Souhlal
2010-04-15 17:24 ` Suleiman Souhlal
2010-04-20 2:56 ` Ying Han
2010-04-20 2:56 ` Ying Han
2010-04-15 9:32 ` Dave Chinner
2010-04-15 9:32 ` Dave Chinner
2010-04-15 9:41 ` KOSAKI Motohiro
2010-04-15 9:41 ` KOSAKI Motohiro
2010-04-15 17:27 ` Suleiman Souhlal
2010-04-15 17:27 ` Suleiman Souhlal
2010-04-15 23:33 ` Dave Chinner
2010-04-15 23:33 ` Dave Chinner
2010-04-15 23:41 ` Suleiman Souhlal
2010-04-15 23:41 ` Suleiman Souhlal
2010-04-16 9:50 ` Alan Cox
2010-04-16 9:50 ` Alan Cox
2010-04-17 3:06 ` Dave Chinner
2010-04-17 3:06 ` Dave Chinner
2010-04-15 8:18 ` KOSAKI Motohiro
2010-04-15 8:18 ` KOSAKI Motohiro
2010-04-15 8:18 ` KOSAKI Motohiro
2010-04-15 10:31 ` Mel Gorman
2010-04-15 10:31 ` Mel Gorman
2010-04-15 11:26 ` KOSAKI Motohiro
2010-04-15 11:26 ` KOSAKI Motohiro
2010-04-15 4:13 ` [PATCH 2/4] vmscan: kill prev_priority completely KOSAKI Motohiro
2010-04-15 4:13 ` KOSAKI Motohiro
2010-04-15 4:13 ` KOSAKI Motohiro
2010-04-15 4:14 ` [PATCH 3/4] vmscan: move priority variable into scan_control KOSAKI Motohiro
2010-04-15 4:14 ` KOSAKI Motohiro
2010-04-15 4:14 ` KOSAKI Motohiro
2010-04-15 4:15 ` [PATCH 4/4] vmscan: delegate page cleaning io to flusher thread if VM pressure is low KOSAKI Motohiro
2010-04-15 4:15 ` KOSAKI Motohiro
2010-04-15 4:15 ` KOSAKI Motohiro
2010-04-15 4:35 ` [PATCH] mm: disallow direct reclaim page writeback KOSAKI Motohiro
2010-04-15 4:35 ` KOSAKI Motohiro
2010-04-15 6:32 ` Dave Chinner
2010-04-15 6:32 ` Dave Chinner
2010-04-15 6:44 ` KOSAKI Motohiro
2010-04-15 6:44 ` KOSAKI Motohiro
2010-04-15 6:58 ` Dave Chinner
2010-04-15 6:58 ` Dave Chinner
2010-04-15 6:20 ` Dave Chinner
2010-04-15 6:20 ` Dave Chinner
2010-04-15 6:35 ` KOSAKI Motohiro
2010-04-15 6:35 ` KOSAKI Motohiro
2010-04-15 8:54 ` Dave Chinner
2010-04-15 8:54 ` Dave Chinner
2010-04-15 10:21 ` KOSAKI Motohiro
2010-04-15 10:21 ` KOSAKI Motohiro
2010-04-15 10:23 ` [PATCH 1/4] vmscan: simplify shrink_inactive_list() KOSAKI Motohiro
2010-04-15 10:23 ` KOSAKI Motohiro
2010-04-15 13:15 ` Mel Gorman
2010-04-15 13:15 ` Mel Gorman
2010-04-15 15:01 ` Andi Kleen
2010-04-15 15:01 ` Andi Kleen
2010-04-15 15:01 ` Andi Kleen
2010-04-15 15:44 ` Mel Gorman
2010-04-15 15:44 ` Mel Gorman
2010-04-15 16:54 ` Andi Kleen
2010-04-15 16:54 ` Andi Kleen
2010-04-15 23:40 ` Dave Chinner
2010-04-15 23:40 ` Dave Chinner
2010-04-16 7:13 ` Andi Kleen
2010-04-16 7:13 ` Andi Kleen
2010-04-16 14:57 ` Mel Gorman
2010-04-16 14:57 ` Mel Gorman
2010-04-17 2:37 ` Dave Chinner
2010-04-17 2:37 ` Dave Chinner
2010-04-16 14:55 ` Mel Gorman
2010-04-16 14:55 ` Mel Gorman
2010-04-15 18:22 ` Valdis.Kletnieks
2010-04-16 9:39 ` Mel Gorman
2010-04-16 9:39 ` Mel Gorman
2010-04-15 10:24 ` [PATCH 2/4] [cleanup] mm: introduce free_pages_prepare KOSAKI Motohiro
2010-04-15 10:24 ` KOSAKI Motohiro
2010-04-15 10:24 ` KOSAKI Motohiro
2010-04-15 13:33 ` Mel Gorman
2010-04-15 13:33 ` Mel Gorman
2010-04-15 10:24 ` [PATCH 3/4] mm: introduce free_pages_bulk KOSAKI Motohiro
2010-04-15 10:24 ` KOSAKI Motohiro
2010-04-15 10:24 ` KOSAKI Motohiro
2010-04-15 13:46 ` Mel Gorman
2010-04-15 13:46 ` Mel Gorman
2010-04-15 10:26 ` [PATCH 4/4] vmscan: replace the pagevec in shrink_inactive_list() with list KOSAKI Motohiro
2010-04-15 10:26 ` KOSAKI Motohiro
2010-04-15 10:28 ` [PATCH] mm: disallow direct reclaim page writeback Mel Gorman
2010-04-15 10:28 ` Mel Gorman
2010-04-15 13:42 ` Chris Mason
2010-04-15 13:42 ` Chris Mason
2010-04-15 17:50 ` tytso
2010-04-15 17:50 ` tytso
2010-04-15 17:50 ` tytso
2010-04-16 15:05 ` Mel Gorman
2010-04-16 15:05 ` Mel Gorman
2010-04-19 15:15 ` Mel Gorman
2010-04-19 15:15 ` Mel Gorman
2010-04-19 15:15 ` Mel Gorman
2010-04-19 17:38 ` Chris Mason
2010-04-16 15:05 ` Mel Gorman
2010-04-16 4:14 ` Dave Chinner
2010-04-16 4:14 ` Dave Chinner
2010-04-16 15:14 ` Mel Gorman
2010-04-16 15:14 ` Mel Gorman
2010-04-18 0:32 ` Andrew Morton
2010-04-18 0:32 ` Andrew Morton
2010-04-18 19:05 ` Christoph Hellwig
2010-04-18 19:05 ` Christoph Hellwig
2010-04-18 16:31 ` Andrew Morton
2010-04-18 16:31 ` Andrew Morton
2010-04-18 19:35 ` Christoph Hellwig [this message]
2010-04-18 19:35 ` Christoph Hellwig
2010-04-18 19:11 ` Sorin Faibish
2010-04-18 19:11 ` Sorin Faibish
2010-04-18 19:11 ` Sorin Faibish
2010-04-18 19:10 ` Sorin Faibish
2010-04-18 19:10 ` Sorin Faibish
2010-04-18 19:10 ` Sorin Faibish
2010-04-18 21:30 ` James Bottomley
2010-04-18 21:30 ` James Bottomley
2010-04-18 23:34 ` Sorin Faibish
2010-04-18 23:34 ` Sorin Faibish
2010-04-18 23:34 ` Sorin Faibish
2010-04-19 3:08 ` tytso
2010-04-19 3:08 ` tytso
2010-04-19 0:35 ` Dave Chinner
2010-04-19 0:35 ` Dave Chinner
2010-04-19 0:49 ` Arjan van de Ven
2010-04-19 0:49 ` Arjan van de Ven
2010-04-19 1:08 ` Dave Chinner
2010-04-19 1:08 ` Dave Chinner
2010-04-19 4:32 ` Arjan van de Ven
2010-04-19 4:32 ` Arjan van de Ven
2010-04-19 15:20 ` Mel Gorman
2010-04-19 15:20 ` Mel Gorman
2010-04-23 1:06 ` Dave Chinner
2010-04-23 1:06 ` Dave Chinner
2010-04-23 10:50 ` Mel Gorman
2010-04-23 10:50 ` Mel Gorman
2010-04-15 14:57 ` Andi Kleen
2010-04-15 14:57 ` Andi Kleen
2010-04-15 2:37 ` Johannes Weiner
2010-04-15 2:37 ` Johannes Weiner
2010-04-15 2:43 ` KOSAKI Motohiro
2010-04-15 2:43 ` KOSAKI Motohiro
2010-04-16 23:56 ` Johannes Weiner
2010-04-16 23:56 ` Johannes Weiner
2010-04-14 6:52 ` KOSAKI Motohiro
2010-04-14 6:52 ` KOSAKI Motohiro
2010-04-14 10:06 ` Andi Kleen
2010-04-14 10:06 ` Andi Kleen
2010-04-14 10:06 ` Andi Kleen
2010-04-14 11:20 ` Chris Mason
2010-04-14 11:20 ` Chris Mason
2010-04-14 12:15 ` Andi Kleen
2010-04-14 12:15 ` Andi Kleen
2010-04-14 12:15 ` Andi Kleen
2010-04-14 12:32 ` Alan Cox
2010-04-14 12:32 ` Alan Cox
2010-04-14 12:34 ` Andi Kleen
2010-04-14 12:34 ` Andi Kleen
2010-04-14 13:23 ` Mel Gorman
2010-04-14 13:23 ` Mel Gorman
2010-04-14 14:07 ` Chris Mason
2010-04-14 14:07 ` Chris Mason
2010-04-14 0:24 ` Minchan Kim
2010-04-14 0:24 ` Minchan Kim
2010-04-14 4:44 ` Dave Chinner
2010-04-14 4:44 ` Dave Chinner
2010-04-14 7:54 ` Minchan Kim
2010-04-14 7:54 ` Minchan Kim
2010-04-16 1:13 ` KAMEZAWA Hiroyuki
2010-04-16 1:13 ` KAMEZAWA Hiroyuki
2010-04-16 4:18 ` KAMEZAWA Hiroyuki
2010-04-16 4:18 ` KAMEZAWA Hiroyuki
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