From: Christoph Hellwig <hch@infradead.org>
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>, Rik van Riel <riel@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Christoph Hellwig <hch@infradead.org>,
Wu Fengguang <fengguang.wu@intel.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [PATCH 4/8] vmscan: Do not writeback filesystem pages in direct reclaim
Date: Mon, 19 Jul 2010 10:19:34 -0400 [thread overview]
Message-ID: <20100719141934.GB12510@infradead.org> (raw)
In-Reply-To: <1279545090-19169-5-git-send-email-mel@csn.ul.ie>
On Mon, Jul 19, 2010 at 02:11:26PM +0100, Mel Gorman wrote:
> As the call-chain for writing anonymous pages is not expected to be deep
> and they are not cleaned by flusher threads, anonymous pages are still
> written back in direct reclaim.
While it is not quite as deep as it skips the filesystem allocator and
extent mapping code it can still be quite deep for swap given that it
still has to traverse the whole I/O stack. Probably not worth worrying
about now, but we need to keep an eye on it.
The patch looks fine to me anyway.
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next prev parent reply other threads:[~2010-07-19 14:19 UTC|newest]
Thread overview: 87+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-19 13:11 [PATCH 0/8] Reduce writeback from page reclaim context V4 Mel Gorman
2010-07-19 13:11 ` [PATCH 1/8] vmscan: tracing: Roll up of patches currently in mmotm Mel Gorman
2010-07-19 13:11 ` [PATCH 2/8] vmscan: tracing: Update trace event to track if page reclaim IO is for anon or file pages Mel Gorman
2010-07-19 13:24 ` Rik van Riel
2010-07-19 14:15 ` Christoph Hellwig
2010-07-19 14:24 ` Mel Gorman
2010-07-19 14:26 ` Christoph Hellwig
2010-07-19 13:11 ` [PATCH 3/8] vmscan: tracing: Update post-processing script to distinguish between anon and file IO from page reclaim Mel Gorman
2010-07-19 13:32 ` Rik van Riel
2010-07-19 13:11 ` [PATCH 4/8] vmscan: Do not writeback filesystem pages in direct reclaim Mel Gorman
2010-07-19 14:19 ` Christoph Hellwig [this message]
2010-07-19 14:26 ` Mel Gorman
2010-07-19 18:25 ` Rik van Riel
2010-07-19 22:14 ` Johannes Weiner
2010-07-20 13:45 ` Mel Gorman
2010-07-20 22:02 ` Johannes Weiner
2010-07-21 11:36 ` Johannes Weiner
2010-07-21 11:52 ` Mel Gorman
2010-07-21 12:01 ` KAMEZAWA Hiroyuki
2010-07-21 14:27 ` Mel Gorman
2010-07-21 23:57 ` KAMEZAWA Hiroyuki
2010-07-22 9:19 ` Mel Gorman
2010-07-22 9:22 ` KAMEZAWA Hiroyuki
2010-07-21 13:04 ` Johannes Weiner
2010-07-21 13:38 ` Mel Gorman
2010-07-21 14:28 ` Johannes Weiner
2010-07-21 14:31 ` Mel Gorman
2010-07-21 14:39 ` Johannes Weiner
2010-07-21 15:06 ` Mel Gorman
2010-07-26 8:29 ` Wu Fengguang
2010-07-26 9:12 ` Mel Gorman
2010-07-26 11:19 ` Wu Fengguang
2010-07-26 12:53 ` Mel Gorman
2010-07-26 13:03 ` Wu Fengguang
2010-07-19 13:11 ` [PATCH 5/8] fs,btrfs: Allow kswapd to writeback pages Mel Gorman
2010-07-19 18:27 ` Rik van Riel
2010-07-19 13:11 ` [PATCH 6/8] fs,xfs: " Mel Gorman
2010-07-19 14:20 ` Christoph Hellwig
2010-07-19 14:43 ` Mel Gorman
2010-07-19 13:11 ` [PATCH 7/8] writeback: sync old inodes first in background writeback Mel Gorman
2010-07-19 14:21 ` Christoph Hellwig
2010-07-19 14:40 ` Mel Gorman
2010-07-19 14:48 ` Christoph Hellwig
2010-07-22 8:52 ` Wu Fengguang
2010-07-22 9:02 ` Wu Fengguang
2010-07-22 9:21 ` Wu Fengguang
2010-07-22 10:48 ` Mel Gorman
2010-07-23 9:45 ` Wu Fengguang
2010-07-23 10:57 ` Mel Gorman
2010-07-23 11:49 ` Wu Fengguang
2010-07-23 12:20 ` Wu Fengguang
2010-07-25 10:43 ` KOSAKI Motohiro
2010-07-25 12:03 ` Minchan Kim
2010-07-26 3:27 ` Wu Fengguang
2010-07-26 4:11 ` Minchan Kim
2010-07-26 4:37 ` Wu Fengguang
2010-07-26 16:30 ` Minchan Kim
2010-07-26 22:48 ` Wu Fengguang
2010-07-26 3:08 ` Wu Fengguang
2010-07-26 3:11 ` Rik van Riel
2010-07-26 3:17 ` Wu Fengguang
2010-07-22 15:34 ` Minchan Kim
2010-07-23 11:59 ` Wu Fengguang
2010-07-22 9:42 ` Mel Gorman
2010-07-23 8:33 ` Wu Fengguang
2010-07-22 1:13 ` Wu Fengguang
2010-07-19 18:43 ` Rik van Riel
2010-07-19 13:11 ` [PATCH 8/8] vmscan: Kick flusher threads to clean pages when reclaim is encountering dirty pages Mel Gorman
2010-07-19 14:23 ` Christoph Hellwig
2010-07-19 14:37 ` Mel Gorman
2010-07-19 22:48 ` Johannes Weiner
2010-07-20 14:10 ` Mel Gorman
2010-07-20 22:05 ` Johannes Weiner
2010-07-19 18:59 ` Rik van Riel
2010-07-19 22:26 ` Johannes Weiner
2010-07-26 7:28 ` Wu Fengguang
2010-07-26 9:26 ` Mel Gorman
2010-07-26 11:27 ` Wu Fengguang
2010-07-26 12:57 ` Mel Gorman
2010-07-26 13:10 ` Wu Fengguang
2010-07-27 13:35 ` Mel Gorman
2010-07-27 14:24 ` Wu Fengguang
2010-07-27 14:34 ` Wu Fengguang
2010-07-27 14:40 ` Mel Gorman
2010-07-27 14:55 ` Wu Fengguang
2010-07-27 14:38 ` Mel Gorman
2010-07-27 15:21 ` Wu Fengguang
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