From: Rik van Riel <riel@redhat.com>
To: Johannes Weiner <jweiner@redhat.com>
Cc: "xfs@oss.sgi.com" <xfs@oss.sgi.com>,
Christoph Hellwig <hch@infradead.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Mel Gorman <mgorman@suse.de>,
Wu Fengguang <fengguang.wu@intel.com>
Subject: Re: [PATCH 03/27] xfs: use write_cache_pages for writeback clustering
Date: Mon, 11 Jul 2011 15:09:24 -0400 [thread overview]
Message-ID: <4E1B4A64.6040403@redhat.com> (raw)
In-Reply-To: <20110711172050.GA2849@redhat.com>
On 07/11/2011 01:20 PM, Johannes Weiner wrote:
> I CC'd Rik for reclaim-wizardry. But if I am not completly off with
> this there is a chance that the change that let the active list grow
> unscanned may actually have contributed to this single-page writing
> problem becoming worse?
Yes, the patch probably contributed.
However, the patch does help protect the working set in
the page cache from streaming IO, so on balance I believe
we need to keep this change.
What it changes is that the size of the inactive file list
can no longer grow unbounded, keeping it a little smaller
than it could have grown in the past.
> commit 56e49d218890f49b0057710a4b6fef31f5ffbfec
> Author: Rik van Riel<riel@redhat.com>
> Date: Tue Jun 16 15:32:28 2009 -0700
>
> vmscan: evict use-once pages first
>
> When the file LRU lists are dominated by streaming IO pages, evict those
> pages first, before considering evicting other pages.
>
> This should be safe from deadlocks or performance problems
> because only three things can happen to an inactive file page:
>
> 1) referenced twice and promoted to the active list
> 2) evicted by the pageout code
> 3) under IO, after which it will get evicted or promoted
>
> The pages freed in this way can either be reused for streaming IO, or
> allocated for something else. If the pages are used for streaming IO,
> this pageout pattern continues. Otherwise, we will fall back to the
> normal pageout pattern.
>
> Signed-off-by: Rik van Riel<riel@redhat.com>
> Reported-by: Elladan<elladan@eskimo.com>
> Cc: KOSAKI Motohiro<kosaki.motohiro@jp.fujitsu.com>
> Cc: Peter Zijlstra<peterz@infradead.org>
> Cc: Lee Schermerhorn<lee.schermerhorn@hp.com>
> Acked-by: Johannes Weiner<hannes@cmpxchg.org>
> Signed-off-by: Andrew Morton<akpm@linux-foundation.org>
> Signed-off-by: Linus Torvalds<torvalds@linux-foundation.org>
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next prev parent reply other threads:[~2011-07-11 19:09 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-29 14:01 [PATCH 00/27] patch queue for Linux 3.1 Christoph Hellwig
2011-06-29 14:01 ` [PATCH 01/27] xfs: PF_FSTRANS should never be set in ->writepage Christoph Hellwig
2011-06-30 1:34 ` Dave Chinner
2011-06-29 14:01 ` [PATCH 02/27] xfs: remove the unused ilock_nowait codepath in writepage Christoph Hellwig
2011-06-30 0:15 ` Dave Chinner
2011-06-30 1:26 ` Dave Chinner
2011-06-30 6:55 ` Christoph Hellwig
2011-06-29 14:01 ` [PATCH 03/27] xfs: use write_cache_pages for writeback clustering Christoph Hellwig
2011-06-30 2:00 ` Dave Chinner
2011-06-30 2:48 ` Dave Chinner
2011-06-30 6:57 ` Christoph Hellwig
2011-07-01 2:22 ` Dave Chinner
2011-07-01 4:18 ` Dave Chinner
2011-07-01 8:59 ` Christoph Hellwig
2011-07-01 9:20 ` Dave Chinner
2011-07-01 9:33 ` Christoph Hellwig
2011-07-01 14:59 ` Mel Gorman
2011-07-01 15:15 ` Christoph Hellwig
2011-07-02 2:42 ` Dave Chinner
2011-07-05 14:10 ` Mel Gorman
2011-07-05 15:55 ` Dave Chinner
2011-07-11 10:26 ` Christoph Hellwig
2011-07-01 15:41 ` Wu Fengguang
2011-07-04 3:25 ` Dave Chinner
2011-07-05 14:34 ` Mel Gorman
2011-07-06 1:23 ` Dave Chinner
2011-07-11 11:10 ` Christoph Hellwig
2011-07-06 4:53 ` Wu Fengguang
2011-07-06 6:47 ` Minchan Kim
2011-07-06 7:17 ` Dave Chinner
2011-07-06 15:12 ` Johannes Weiner
2011-07-08 9:54 ` Dave Chinner
2011-07-11 17:20 ` Johannes Weiner
2011-07-11 17:24 ` Christoph Hellwig
2011-07-11 19:09 ` Rik van Riel [this message]
2011-07-01 8:51 ` Christoph Hellwig
2011-06-29 14:01 ` [PATCH 04/27] xfs: cleanup xfs_add_to_ioend Christoph Hellwig
2011-06-29 22:13 ` Alex Elder
2011-06-30 2:00 ` Dave Chinner
2011-06-29 14:01 ` [PATCH 05/27] xfs: work around bogus gcc warning in xfs_allocbt_init_cursor Christoph Hellwig
2011-06-29 22:13 ` Alex Elder
2011-06-29 14:01 ` [PATCH 06/27] xfs: split xfs_setattr Christoph Hellwig
2011-06-29 22:13 ` Alex Elder
2011-06-30 7:03 ` Christoph Hellwig
2011-06-30 12:28 ` Alex Elder
2011-06-30 2:11 ` Dave Chinner
2011-06-29 14:01 ` [PATCH 08/27] xfs: kill xfs_itruncate_start Christoph Hellwig
2011-06-29 22:13 ` Alex Elder
2011-06-29 14:01 ` [PATCH 09/27] xfs: split xfs_itruncate_finish Christoph Hellwig
2011-06-30 2:44 ` Dave Chinner
2011-06-30 7:18 ` Christoph Hellwig
2011-06-29 14:01 ` [PATCH 10/27] xfs: improve sync behaviour in the fact of aggressive dirtying Christoph Hellwig
2011-06-30 2:52 ` Dave Chinner
2011-06-29 14:01 ` [PATCH 11/27] xfs: fix filesystsem freeze race in xfs_trans_alloc Christoph Hellwig
2011-06-30 2:59 ` Dave Chinner
2011-06-29 14:01 ` [PATCH 12/27] xfs: remove i_transp Christoph Hellwig
2011-06-30 3:00 ` Dave Chinner
2011-06-29 14:01 ` [PATCH 13/27] xfs: factor out xfs_dir2_leaf_find_entry Christoph Hellwig
2011-06-30 6:11 ` Dave Chinner
2011-06-30 7:34 ` Christoph Hellwig
2011-06-29 14:01 ` [PATCH 14/27] xfs: cleanup shortform directory inode number handling Christoph Hellwig
2011-06-30 6:35 ` Dave Chinner
2011-06-30 7:39 ` Christoph Hellwig
2011-06-29 14:01 ` [PATCH 15/27] xfs: kill struct xfs_dir2_sf Christoph Hellwig
2011-06-30 7:04 ` Dave Chinner
2011-06-30 7:09 ` Christoph Hellwig
2011-06-29 14:01 ` [PATCH 16/27] xfs: cleanup the defintion of struct xfs_dir2_sf_entry Christoph Hellwig
2011-06-29 14:01 ` [PATCH 17/27] xfs: avoid usage of struct xfs_dir2_block Christoph Hellwig
2011-06-29 14:01 ` [PATCH 18/27] xfs: kill " Christoph Hellwig
2011-06-29 14:01 ` [PATCH 19/27] xfs: avoid usage of struct xfs_dir2_data Christoph Hellwig
2011-06-29 14:01 ` [PATCH 20/27] xfs: kill " Christoph Hellwig
2011-06-29 14:01 ` [PATCH 21/27] xfs: cleanup the defintion of struct xfs_dir2_data_entry Christoph Hellwig
2011-06-29 14:01 ` [PATCH 22/27] xfs: cleanup struct xfs_dir2_leaf Christoph Hellwig
2011-06-29 14:01 ` [PATCH 23/27] xfs: remove the unused xfs_bufhash structure Christoph Hellwig
2011-06-29 14:01 ` [PATCH 24/27] xfs: clean up buffer locking helpers Christoph Hellwig
2011-06-29 14:01 ` [PATCH 25/27] xfs: return the buffer locked from xfs_buf_get_uncached Christoph Hellwig
2011-06-29 14:01 ` [PATCH 26/27] xfs: cleanup I/O-related buffer flags Christoph Hellwig
2011-06-29 14:01 ` [PATCH 27/27] xfs: avoid a few disk cache flushes Christoph Hellwig
2011-06-30 6:36 ` [PATCH 00/27] patch queue for Linux 3.1 Dave Chinner
2011-06-30 6:50 ` Christoph Hellwig
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