From: Rik van Riel <riel@redhat.com>
To: Mel Gorman <mel@csn.ul.ie>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org, Dave Chinner <david@fromorbit.com>,
Chris Mason <chris.mason@oracle.com>,
Nick Piggin <npiggin@suse.de>,
Johannes Weiner <hannes@cmpxchg.org>,
Christoph Hellwig <hch@infradead.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 11/12] vmscan: Write out dirty pages in batch
Date: Mon, 14 Jun 2010 17:13:37 -0400 [thread overview]
Message-ID: <4C169B81.8010707@redhat.com> (raw)
In-Reply-To: <1276514273-27693-12-git-send-email-mel@csn.ul.ie>
On 06/14/2010 07:17 AM, Mel Gorman wrote:
> Page reclaim cleans individual pages using a_ops->writepage() because from
> the VM perspective, it is known that pages in a particular zone must be freed
> soon, it considers the target page to be the oldest and it does not want
> to wait while background flushers cleans other pages. From a filesystem
> perspective this is extremely inefficient as it generates a very seeky
> IO pattern leading to the perverse situation where it can take longer to
> clean all dirty pages than it would have otherwise.
Reclaiming clean pages should be fast enough that this should
make little, if any, difference.
> This patch queues all dirty pages at once to maximise the chances that
> the write requests get merged efficiently. It also makes the next patch
> that avoids writeout from direct reclaim more straight-forward.
However, this is a convincing argument :)
> Signed-off-by: Mel Gorman<mel@csn.ul.ie>
Reviewed-by: Rik van Riel <riel@redhat.com>
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next prev parent reply other threads:[~2010-06-14 21:13 UTC|newest]
Thread overview: 99+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-14 11:17 [PATCH 0/12] Avoid overflowing of stack during page reclaim V2 Mel Gorman
2010-06-14 11:17 ` [PATCH 01/12] tracing, vmscan: Add trace events for kswapd wakeup, sleeping and direct reclaim Mel Gorman
2010-06-14 15:45 ` Rik van Riel
2010-06-14 21:01 ` Larry Woodman
2010-06-14 11:17 ` [PATCH 02/12] tracing, vmscan: Add trace events for LRU page isolation Mel Gorman
2010-06-14 16:47 ` Rik van Riel
2010-06-14 21:02 ` Larry Woodman
2010-06-14 11:17 ` [PATCH 03/12] tracing, vmscan: Add trace event when a page is written Mel Gorman
2010-06-14 16:48 ` Rik van Riel
2010-06-14 21:02 ` Larry Woodman
2010-06-14 11:17 ` [PATCH 04/12] tracing, vmscan: Add a postprocessing script for reclaim-related ftrace events Mel Gorman
2010-06-14 17:55 ` Rik van Riel
2010-06-14 21:03 ` Larry Woodman
2010-06-14 11:17 ` [PATCH 05/12] vmscan: kill prev_priority completely Mel Gorman
2010-06-14 18:04 ` Rik van Riel
2010-06-16 23:37 ` Andrew Morton
2010-06-16 23:45 ` Rik van Riel
2010-06-17 0:18 ` Andrew Morton
2010-06-17 0:34 ` Rik van Riel
2010-06-25 8:29 ` KOSAKI Motohiro
2010-06-28 10:35 ` Mel Gorman
2010-06-14 11:17 ` [PATCH 06/12] vmscan: simplify shrink_inactive_list() Mel Gorman
2010-06-14 18:06 ` Rik van Riel
2010-06-15 10:13 ` Mel Gorman
2010-06-14 11:17 ` [PATCH 07/12] vmscan: Remove unnecessary temporary vars in do_try_to_free_pages Mel Gorman
2010-06-14 18:14 ` Rik van Riel
2010-06-14 11:17 ` [PATCH 08/12] vmscan: Setup pagevec as late as possible in shrink_inactive_list() Mel Gorman
2010-06-14 18:59 ` Rik van Riel
2010-06-15 10:47 ` Christoph Hellwig
2010-06-15 15:56 ` Mel Gorman
2010-06-16 23:43 ` Andrew Morton
2010-06-17 10:30 ` Mel Gorman
2010-06-14 11:17 ` [PATCH 09/12] vmscan: Setup pagevec as late as possible in shrink_page_list() Mel Gorman
2010-06-14 19:24 ` Rik van Riel
2010-06-16 23:48 ` Andrew Morton
2010-06-17 10:46 ` Mel Gorman
2010-06-14 11:17 ` [PATCH 10/12] vmscan: Update isolated page counters outside of main path in shrink_inactive_list() Mel Gorman
2010-06-14 19:42 ` Rik van Riel
2010-06-14 11:17 ` [PATCH 11/12] vmscan: Write out dirty pages in batch Mel Gorman
2010-06-14 21:13 ` Rik van Riel [this message]
2010-06-15 10:18 ` Mel Gorman
2010-06-14 23:11 ` Dave Chinner
2010-06-14 23:21 ` Andrew Morton
2010-06-15 0:39 ` Dave Chinner
2010-06-15 1:16 ` Rik van Riel
2010-06-15 1:45 ` Andrew Morton
2010-06-15 4:08 ` Rik van Riel
2010-06-15 4:37 ` Andrew Morton
2010-06-15 5:12 ` Nick Piggin
2010-06-15 5:43 ` [patch] mm: vmscan fix mapping use after free Nick Piggin
2010-06-15 13:23 ` Mel Gorman
2010-06-15 11:01 ` [PATCH 11/12] vmscan: Write out dirty pages in batch Christoph Hellwig
2010-06-15 13:32 ` Rik van Riel
2010-06-15 1:39 ` Andrew Morton
2010-06-15 3:20 ` Dave Chinner
2010-06-15 4:15 ` Andrew Morton
2010-06-15 6:36 ` Dave Chinner
2010-06-15 10:28 ` Evgeniy Polyakov
2010-06-15 10:55 ` Nick Piggin
2010-06-15 11:10 ` Christoph Hellwig
2010-06-15 11:20 ` Nick Piggin
2010-06-15 23:20 ` Dave Chinner
2010-06-16 6:04 ` Nick Piggin
2010-06-15 11:08 ` Christoph Hellwig
2010-06-15 11:43 ` Mel Gorman
2010-06-15 13:07 ` tytso
2010-06-15 15:44 ` Mel Gorman
2010-06-15 10:57 ` Christoph Hellwig
2010-06-15 10:53 ` Christoph Hellwig
2010-06-15 11:11 ` Mel Gorman
2010-06-15 11:13 ` Nick Piggin
2010-06-14 11:17 ` [PATCH 12/12] vmscan: Do not writeback pages in direct reclaim Mel Gorman
2010-06-14 21:55 ` Rik van Riel
2010-06-15 11:45 ` Mel Gorman
2010-06-15 13:34 ` Rik van Riel
2010-06-15 13:37 ` Christoph Hellwig
2010-06-15 13:54 ` Mel Gorman
2010-06-16 0:30 ` KAMEZAWA Hiroyuki
2010-06-15 14:02 ` Rik van Riel
2010-06-15 13:59 ` Mel Gorman
2010-06-15 14:04 ` Rik van Riel
2010-06-15 14:16 ` Mel Gorman
2010-06-16 0:17 ` KAMEZAWA Hiroyuki
2010-06-16 0:29 ` Rik van Riel
2010-06-16 0:39 ` KAMEZAWA Hiroyuki
2010-06-16 0:53 ` Rik van Riel
2010-06-16 1:40 ` KAMEZAWA Hiroyuki
2010-06-16 2:20 ` KAMEZAWA Hiroyuki
2010-06-16 5:11 ` Christoph Hellwig
2010-06-16 10:51 ` Jens Axboe
2010-06-16 5:07 ` Christoph Hellwig
2010-06-16 5:06 ` Christoph Hellwig
2010-06-17 0:25 ` KAMEZAWA Hiroyuki
2010-06-17 6:16 ` Christoph Hellwig
2010-06-17 6:23 ` KAMEZAWA Hiroyuki
2010-06-14 15:10 ` [PATCH 0/12] Avoid overflowing of stack during page reclaim V2 Christoph Hellwig
2010-06-15 11:45 ` Mel Gorman
2010-06-15 0:08 ` KAMEZAWA Hiroyuki
2010-06-15 11:49 ` Mel Gorman
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