From: Christoph Hellwig <hch@infradead.org>
To: Mel Gorman <mel@csn.ul.ie>
Cc: Minchan Kim <minchan.kim@gmail.com>,
Johannes Weiner <hannes@cmpxchg.org>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Andrew Morton <akpm@linux-foundation.org>,
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>,
Christoph Hellwig <hch@infradead.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [PATCH 12/14] vmscan: Do not writeback pages in direct reclaim
Date: Tue, 6 Jul 2010 21:15:33 -0400 [thread overview]
Message-ID: <20100707011533.GB3630@infradead.org> (raw)
In-Reply-To: <20100707002458.GI13780@csn.ul.ie>
On Wed, Jul 07, 2010 at 01:24:58AM +0100, Mel Gorman wrote:
> What I have now is direct writeback for anon files. For files be it from
> kswapd or direct reclaim, I kick writeback pre-emptively by an amount based
> on the dirty pages encountered because monitoring from systemtap indicated
> that we were getting a large percentage of the dirty file pages at the end
> of the LRU lists (bad). Initial tests show that page reclaim writeback is
> reduced from kswapd by 97% with this sort of pre-emptive kicking of flusher
> threads based on these figures from sysbench.
That sounds like yet another bad aid to me. Instead it would be much
better to not have so many file pages at the end of LRU by tuning the
flusher threads and VM better.
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next prev parent reply other threads:[~2010-07-07 1:15 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-29 11:34 [PATCH 0/14] Avoid overflowing of stack during page reclaim V3 Mel Gorman
2010-06-29 11:34 ` [PATCH 01/14] vmscan: Fix mapping use after free Mel Gorman
2010-06-29 14:27 ` Minchan Kim
2010-07-01 9:53 ` Mel Gorman
2010-06-29 14:44 ` Johannes Weiner
2010-06-29 11:34 ` [PATCH 02/14] tracing, vmscan: Add trace events for kswapd wakeup, sleeping and direct reclaim Mel Gorman
2010-06-29 11:34 ` [PATCH 03/14] tracing, vmscan: Add trace events for LRU page isolation Mel Gorman
2010-06-29 11:34 ` [PATCH 04/14] tracing, vmscan: Add trace event when a page is written Mel Gorman
2010-06-29 11:34 ` [PATCH 05/14] tracing, vmscan: Add a postprocessing script for reclaim-related ftrace events Mel Gorman
2010-06-29 11:34 ` [PATCH 06/14] vmscan: kill prev_priority completely Mel Gorman
2010-06-29 11:34 ` [PATCH 07/14] vmscan: simplify shrink_inactive_list() Mel Gorman
2010-06-29 11:34 ` [PATCH 08/14] vmscan: Remove unnecessary temporary vars in do_try_to_free_pages Mel Gorman
2010-06-29 11:34 ` [PATCH 09/14] vmscan: Setup pagevec as late as possible in shrink_inactive_list() Mel Gorman
2010-06-29 11:34 ` [PATCH 10/14] vmscan: Setup pagevec as late as possible in shrink_page_list() Mel Gorman
2010-06-29 11:34 ` [PATCH 11/14] vmscan: Update isolated page counters outside of main path in shrink_inactive_list() Mel Gorman
2010-06-29 11:34 ` [PATCH 12/14] vmscan: Do not writeback pages in direct reclaim Mel Gorman
2010-07-02 19:51 ` Andrew Morton
2010-07-05 13:49 ` Mel Gorman
2010-07-06 0:36 ` KOSAKI Motohiro
2010-07-06 5:46 ` Minchan Kim
2010-07-06 6:02 ` KOSAKI Motohiro
2010-07-06 6:38 ` Minchan Kim
2010-07-06 10:12 ` Mel Gorman
2010-07-06 11:13 ` KOSAKI Motohiro
2010-07-06 11:24 ` Minchan Kim
2010-07-06 15:25 ` Mel Gorman
2010-07-06 20:27 ` Johannes Weiner
2010-07-06 22:28 ` Minchan Kim
2010-07-07 0:24 ` Mel Gorman
2010-07-07 1:15 ` Christoph Hellwig [this message]
2010-07-07 9:43 ` Mel Gorman
2010-07-07 12:51 ` Rik van Riel
2010-07-07 1:14 ` Christoph Hellwig
2010-07-08 6:39 ` KOSAKI Motohiro
2010-07-07 5:03 ` Wu Fengguang
2010-07-07 9:50 ` Mel Gorman
2010-07-07 18:09 ` Christoph Hellwig
2010-06-29 11:34 ` [PATCH 13/14] fs,btrfs: Allow kswapd to writeback pages Mel Gorman
2010-06-30 13:05 ` Chris Mason
2010-07-01 9:55 ` Mel Gorman
2010-06-29 11:34 ` [PATCH 14/14] fs,xfs: " Mel Gorman
2010-06-29 12:37 ` Christoph Hellwig
2010-06-29 12:51 ` Mel Gorman
2010-06-30 0:14 ` KAMEZAWA Hiroyuki
2010-07-01 10:30 ` Mel Gorman
2010-07-02 6:26 ` KAMEZAWA Hiroyuki
2010-07-02 6:31 ` KAMEZAWA Hiroyuki
2010-07-05 14:16 ` Mel Gorman
2010-07-06 0:45 ` KAMEZAWA Hiroyuki
2010-07-02 19:33 ` [PATCH 0/14] Avoid overflowing of stack during page reclaim V3 Andrew Morton
2010-07-05 1:35 ` KAMEZAWA Hiroyuki
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