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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Johannes Weiner <hannes@cmpxchg.org>
Cc: kosaki.motohiro@jp.fujitsu.com,
	Suleiman Souhlal <ssouhlal@freebsd.org>,
	Dave Chinner <david@fromorbit.com>, Mel Gorman <mel@csn.ul.ie>,
	Chris Mason <chris.mason@oracle.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	linux-fsdevel@vger.kernel.org, suleiman@google.com
Subject: Re: [PATCH 1/4] vmscan: delegate pageout io to flusher thread if current is kswapd
Date: Thu, 15 Apr 2010 17:26:27 +0900 (JST)	[thread overview]
Message-ID: <20100415172215.D19B.A69D9226@jp.fujitsu.com> (raw)
In-Reply-To: <20100415171142.D192.A69D9226@jp.fujitsu.com>

Cc to Johannes

> > 
> > On Apr 14, 2010, at 9:11 PM, KOSAKI Motohiro wrote:
> > 
> > > Now, vmscan pageout() is one of IO throuput degression source.
> > > Some IO workload makes very much order-0 allocation and reclaim
> > > and pageout's 4K IOs are making annoying lots seeks.
> > >
> > > At least, kswapd can avoid such pageout() because kswapd don't
> > > need to consider OOM-Killer situation. that's no risk.
> > >
> > > Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
> > 
> > What's your opinion on trying to cluster the writes done by pageout,  
> > instead of not doing any paging out in kswapd?
> > Something along these lines:
> 
> Interesting. 
> So, I'd like to review your patch carefully. can you please give me one
> day? :)

Hannes, if my remember is correct, you tried similar swap-cluster IO
long time ago. now I can't remember why we didn't merged such patch.
Do you remember anything?


> 
> 
> > 
> >      Cluster writes to disk due to memory pressure.
> > 
> >      Write out logically adjacent pages to the one we're paging out
> >      so that we may get better IOs in these situations:
> >      These pages are likely to be contiguous on disk to the one we're
> >      writing out, so they should get merged into a single disk IO.
> > 
> >      Signed-off-by: Suleiman Souhlal <suleiman@google.com>
> 
> 
> 
> 




  reply	other threads:[~2010-04-15  8:26 UTC|newest]

Thread overview: 115+ 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  8:31 ` KOSAKI Motohiro
2010-04-13 10:29   ` Dave Chinner
2010-04-13 11:39     ` KOSAKI Motohiro
2010-04-13 14:36       ` Dave Chinner
2010-04-14  3:12         ` Dave Chinner
2010-04-14  6:52           ` KOSAKI Motohiro
2010-04-15  1:56             ` Dave Chinner
2010-04-14  6:52         ` KOSAKI Motohiro
2010-04-14  7:36           ` Dave Chinner
2010-04-13  9:58 ` Mel Gorman
2010-04-13 11:19   ` Dave Chinner
2010-04-13 19:34     ` Mel Gorman
2010-04-13 20:20       ` Chris Mason
2010-04-14  1:40         ` Dave Chinner
2010-04-14  4:59           ` KAMEZAWA Hiroyuki
2010-04-14  5:41             ` Dave Chinner
2010-04-14  5:54               ` KOSAKI Motohiro
2010-04-14  6:13                 ` Minchan Kim
2010-04-14  7:19                   ` Minchan Kim
2010-04-14  9:42                     ` KAMEZAWA Hiroyuki
2010-04-14 10:01                       ` Minchan Kim
2010-04-14 10:07                         ` Mel Gorman
2010-04-14 10:16                           ` Minchan Kim
2010-04-14  7:06                 ` Dave Chinner
2010-04-14  6:52           ` KOSAKI Motohiro
2010-04-14  7:28             ` Dave Chinner
2010-04-14  8:51               ` Mel Gorman
2010-04-15  1:34                 ` Dave Chinner
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  8:05                       ` Suleiman Souhlal
2010-04-15  8:17                         ` KOSAKI Motohiro
2010-04-15  8:26                           ` KOSAKI Motohiro [this message]
2010-04-15 10:30                             ` Johannes Weiner
2010-04-15 17:24                               ` Suleiman Souhlal
2010-04-20  2:56                               ` Ying Han
2010-04-15  9:32                         ` Dave Chinner
2010-04-15  9:41                           ` KOSAKI Motohiro
2010-04-15 17:27                           ` Suleiman Souhlal
2010-04-15 23:33                             ` Dave Chinner
2010-04-15 23:41                               ` Suleiman Souhlal
2010-04-16  9:50                               ` Alan Cox
2010-04-17  3:06                                 ` Dave Chinner
2010-04-15  8:18                       ` KOSAKI Motohiro
2010-04-15 10:31                       ` Mel Gorman
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  4:14                     ` [PATCH 3/4] vmscan: move priority variable into scan_control 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  4:35                     ` [PATCH] mm: disallow direct reclaim page writeback KOSAKI Motohiro
2010-04-15  6:32                       ` Dave Chinner
2010-04-15  6:44                         ` KOSAKI Motohiro
2010-04-15  6:58                           ` Dave Chinner
2010-04-15  6:20                     ` Dave Chinner
2010-04-15  6:35                       ` KOSAKI Motohiro
2010-04-15  8:54                         ` Dave Chinner
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 13:15                               ` Mel Gorman
2010-04-15 15:01                                 ` Andi Kleen
2010-04-15 15:44                                   ` Mel Gorman
2010-04-15 16:54                                     ` Andi Kleen
2010-04-15 23:40                                       ` Dave Chinner
2010-04-16  7:13                                         ` Andi Kleen
2010-04-16 14:57                                         ` Mel Gorman
2010-04-17  2:37                                           ` Dave Chinner
2010-04-16 14:55                                       ` Mel Gorman
2010-04-15 18:22                                 ` Valdis.Kletnieks
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 13:33                               ` Mel Gorman
2010-04-15 10:24                             ` [PATCH 3/4] mm: introduce free_pages_bulk KOSAKI Motohiro
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 10:28                   ` [PATCH] mm: disallow direct reclaim page writeback Mel Gorman
2010-04-15 13:42                     ` Chris Mason
2010-04-15 17:50                       ` tytso
2010-04-16 15:05                       ` Mel Gorman
2010-04-19 15:15                         ` Mel Gorman
2010-04-16  4:14                     ` Dave Chinner
2010-04-16 15:14                       ` Mel Gorman
2010-04-18  0:32                         ` Andrew Morton
2010-04-18 19:05                           ` Christoph Hellwig
2010-04-18 16:31                             ` Andrew Morton
2010-04-18 19:35                               ` Christoph Hellwig
2010-04-18 19:11                             ` Sorin Faibish
2010-04-18 19:10                           ` Sorin Faibish
2010-04-18 21:30                             ` James Bottomley
2010-04-18 23:34                               ` Sorin Faibish
2010-04-19  3:08                               ` tytso
2010-04-19  0:35                           ` Dave Chinner
2010-04-19  0:49                             ` Arjan van de Ven
2010-04-19  1:08                               ` Dave Chinner
2010-04-19  4:32                                 ` Arjan van de Ven
2010-04-19 15:20                         ` Mel Gorman
2010-04-23  1:06                           ` Dave Chinner
2010-04-23 10:50                             ` Mel Gorman
2010-04-15 14:57                   ` Andi Kleen
2010-04-15  2:37                 ` Johannes Weiner
2010-04-15  2:43                   ` KOSAKI Motohiro
2010-04-16 23:56                     ` Johannes Weiner
2010-04-14  6:52         ` KOSAKI Motohiro
2010-04-14 10:06         ` Andi Kleen
2010-04-14 11:20           ` Chris Mason
2010-04-14 12:15             ` Andi Kleen
2010-04-14 12:32               ` Alan Cox
2010-04-14 12:34                 ` Andi Kleen
2010-04-14 13:23             ` Mel Gorman
2010-04-14 14:07               ` Chris Mason
2010-04-14  0:24 ` Minchan Kim
2010-04-14  4:44   ` Dave Chinner
2010-04-14  7:54     ` Minchan Kim
2010-04-16  1:13 ` KAMEZAWA Hiroyuki
2010-04-16  4:18   ` KAMEZAWA Hiroyuki

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