From: Dave Chinner <david@fromorbit.com>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Jan Kara <jack@suse.cz>, Mel Gorman <mel@linux.vnet.ibm.com>,
Trond Myklebust <Trond.Myklebust@netapp.com>,
Itaru Kitayama <kitayama@cl.bb4u.ne.jp>,
Minchan Kim <minchan.kim@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
linux-fsdevel@vger.kernel.org,
Linux Memory Management List <linux-mm@kvack.org>
Subject: Re: [PATCH 0/6] writeback: moving expire targets for background/kupdate works
Date: Tue, 19 Apr 2011 16:38:23 +1000 [thread overview]
Message-ID: <20110419063823.GD23985@dastard> (raw)
In-Reply-To: <20110419030003.108796967@intel.com>
On Tue, Apr 19, 2011 at 11:00:03AM +0800, Wu Fengguang wrote:
>
> Andrew,
>
> This aims to reduce possible pageout() calls by making the flusher
> concentrate a bit more on old/expired dirty inodes.
In what situation is this a problem? Can you demonstrate how you
trigger it? And then how much improvement does this patchset make?
> Patches 04, 05 have been updated since last post, please review.
> The concerns from last review have been addressed.
>
> It runs fine on simple workloads over ext3/4, xfs, btrfs and NFS.
But it starts propagating new differences between background and
kupdate style writeback. We've been trying to reduce the number of
permutations of writeback behaviour, so it seems to me to be wrong
to further increase the behavioural differences. Indeed, why do we
need "for kupdate" style writeback and "background" writeback
anymore - can' we just use background style writeback for both?
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
next prev parent reply other threads:[~2011-04-19 6:38 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-19 3:00 [PATCH 0/6] writeback: moving expire targets for background/kupdate works Wu Fengguang
2011-04-19 3:00 ` [PATCH 1/6] writeback: pass writeback_control down to move_expired_inodes() Wu Fengguang
2011-04-19 3:00 ` [PATCH 2/6] writeback: the kupdate expire timestamp should be a moving target Wu Fengguang
2011-04-19 7:02 ` Dave Chinner
2011-04-19 7:20 ` Wu Fengguang
2011-04-19 9:31 ` Jan Kara
2011-04-19 3:00 ` [PATCH 3/6] writeback: sync expired inodes first in background writeback Wu Fengguang
2011-04-19 7:35 ` Dave Chinner
2011-04-19 9:57 ` Jan Kara
2011-04-19 12:56 ` Wu Fengguang
2011-04-19 13:46 ` Wu Fengguang
2011-04-20 1:21 ` Dave Chinner
2011-04-20 2:53 ` Wu Fengguang
2011-04-21 0:45 ` Dave Chinner
2011-04-21 2:06 ` Wu Fengguang
2011-04-21 3:01 ` Dave Chinner
2011-04-21 3:59 ` Wu Fengguang
2011-04-21 4:10 ` Wu Fengguang
2011-04-21 4:36 ` Christoph Hellwig
2011-04-21 6:36 ` Dave Chinner
2011-04-21 16:04 ` Jan Kara
2011-04-22 2:24 ` Wu Fengguang
2011-04-22 21:12 ` Jan Kara
2011-04-26 5:37 ` Wu Fengguang
2011-04-26 14:30 ` Jan Kara
2011-04-20 7:38 ` Wu Fengguang
2011-04-21 1:01 ` Dave Chinner
2011-04-21 1:47 ` Wu Fengguang
2011-04-19 3:00 ` [PATCH 4/6] writeback: introduce writeback_control.inodes_cleaned Wu Fengguang
2011-04-19 9:47 ` Jan Kara
2011-04-19 3:00 ` [PATCH 5/6] writeback: try more writeback as long as something was written Wu Fengguang
2011-04-19 10:20 ` Jan Kara
2011-04-19 11:16 ` Wu Fengguang
2011-04-19 21:10 ` Jan Kara
2011-04-20 7:50 ` Wu Fengguang
2011-04-20 15:22 ` Jan Kara
2011-04-21 3:33 ` Wu Fengguang
2011-04-21 4:39 ` Christoph Hellwig
2011-04-21 6:05 ` Wu Fengguang
2011-04-21 16:41 ` Jan Kara
2011-04-22 2:32 ` Wu Fengguang
2011-04-22 21:23 ` Jan Kara
2011-04-21 7:09 ` Dave Chinner
2011-04-21 7:14 ` Christoph Hellwig
2011-04-21 7:52 ` Dave Chinner
2011-04-21 8:00 ` Christoph Hellwig
2011-04-19 3:00 ` [PATCH 6/6] NFS: return -EAGAIN when skipped commit in nfs_commit_unstable_pages() Wu Fengguang
2011-04-19 3:29 ` Trond Myklebust
2011-04-19 3:55 ` Wu Fengguang
2011-04-21 4:40 ` Christoph Hellwig
2011-04-19 6:38 ` Dave Chinner [this message]
2011-04-19 8:02 ` [PATCH 0/6] writeback: moving expire targets for background/kupdate works Wu Fengguang
2011-04-21 4:34 ` Christoph Hellwig
2011-04-21 5:50 ` Wu Fengguang
2011-04-21 5:56 ` Christoph Hellwig
2011-04-21 6:07 ` Wu Fengguang
2011-04-21 7:17 ` Christoph Hellwig
2011-04-21 10:15 ` Wu Fengguang
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