From: Suleiman Souhlal <ssouhlal@freebsd.org> To: Dave Chinner <david@fromorbit.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.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 10:27:09 -0700 [thread overview] Message-ID: <85DB7083-8E78-4884-9E76-5BD803C530EF@freebsd.org> (raw) In-Reply-To: <20100415093214.GV2493@dastard> On Apr 15, 2010, at 2:32 AM, Dave Chinner wrote: > On Thu, Apr 15, 2010 at 01:05:57AM -0700, Suleiman Souhlal wrote: >> >> 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? > > XFS already does this in ->writepage to try to minimise the impact > of the way pageout issues IO. It helps, but it is still not as good > as having all the writeback come from the flusher threads because > it's still pretty much random IO. Doesn't the randomness become irrelevant if you can cluster enough pages? > And, FWIW, it doesn't solve the stack usage problems, either. In > fact, it will make them worse as write_one_page() puts another > struct writeback_control on the stack... Sorry, this patch was not meant to solve the stack usage problems. -- Suleiman
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From: Suleiman Souhlal <ssouhlal@freebsd.org> To: Dave Chinner <david@fromorbit.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.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 10:27:09 -0700 [thread overview] Message-ID: <85DB7083-8E78-4884-9E76-5BD803C530EF@freebsd.org> (raw) In-Reply-To: <20100415093214.GV2493@dastard> On Apr 15, 2010, at 2:32 AM, Dave Chinner wrote: > On Thu, Apr 15, 2010 at 01:05:57AM -0700, Suleiman Souhlal wrote: >> >> 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? > > XFS already does this in ->writepage to try to minimise the impact > of the way pageout issues IO. It helps, but it is still not as good > as having all the writeback come from the flusher threads because > it's still pretty much random IO. Doesn't the randomness become irrelevant if you can cluster enough pages? > And, FWIW, it doesn't solve the stack usage problems, either. In > fact, it will make them worse as write_one_page() puts another > struct writeback_control on the stack... Sorry, this patch was not meant to solve the stack usage problems. -- Suleiman -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2010-04-15 17:27 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 [this message] 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 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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