From: Mel Gorman <mgorman@suse.de>
To: Johannes Weiner <jweiner@redhat.com>
Cc: Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>, XFS <xfs@oss.sgi.com>,
Dave Chinner <david@fromorbit.com>,
Christoph Hellwig <hch@infradead.org>,
Wu Fengguang <fengguang.wu@intel.com>, Jan Kara <jack@suse.cz>,
Rik van Riel <riel@redhat.com>,
Minchan Kim <minchan.kim@gmail.com>
Subject: Re: [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from kswapd
Date: Wed, 3 Aug 2011 14:58:39 +0100 [thread overview]
Message-ID: <20110803135839.GL19099@suse.de> (raw)
In-Reply-To: <20110803113706.GF27199@redhat.com>
On Wed, Aug 03, 2011 at 01:37:06PM +0200, Johannes Weiner wrote:
> On Thu, Jul 21, 2011 at 05:28:50PM +0100, Mel Gorman wrote:
> > Assuming that flusher threads will always write back dirty pages promptly
> > then it is always faster for reclaimers to wait for flushers. This patch
> > prevents kswapd writing back any filesystem pages.
> >
> > Signed-off-by: Mel Gorman <mgorman@suse.de>
>
> Relying on the flushers may mean that every dirty page in the system
> has to be written back before the pages from the zone of interest are
> clean.
>
Yes.
> De-facto we have only one mechanism to stay on top of the dirty pages
> from a per-zone perspective, and that is single-page writeout from
> reclaim.
>
Yes.
> While we all agree that this sucks, we can not remove it unless we
> have a replacement that makes zones reclaimable in a reasonable time
> frame (or keep them reclaimable in the first place, what per-zone
> dirty limits attempt to do).
>
> As such, please include
>
> Nacked-by: Johannes Weiner <jweiner@redhat.com>
I've already dropped the patch. If I could, I would have signed this at
the time as
Signed-off-but-naking-it-anyway: Mel Gorman <mgorman@suse.de
--
Mel Gorman
SUSE Labs
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2011-08-03 13:58 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-21 16:28 [RFC PATCH 0/8] Reduce filesystem writeback from page reclaim v2 Mel Gorman
2011-07-21 16:28 ` [PATCH 1/8] mm: vmscan: Do not writeback filesystem pages in direct reclaim Mel Gorman
2011-07-31 15:06 ` Minchan Kim
2011-08-02 11:21 ` Mel Gorman
2011-07-21 16:28 ` [PATCH 2/8] xfs: Warn if direct reclaim tries to writeback pages Mel Gorman
2011-07-24 11:32 ` Christoph Hellwig
2011-07-25 8:19 ` Mel Gorman
2011-07-21 16:28 ` [PATCH 3/8] ext4: " Mel Gorman
2011-08-03 10:58 ` Johannes Weiner
2011-08-03 11:06 ` Johannes Weiner
2011-08-03 13:44 ` Mel Gorman
2011-08-03 14:00 ` Johannes Weiner
2011-08-03 14:18 ` Christoph Hellwig
2011-08-03 14:35 ` Mel Gorman
2011-07-21 16:28 ` [PATCH 4/8] btrfs: " Mel Gorman
2011-08-03 11:10 ` Johannes Weiner
2011-08-03 13:45 ` Mel Gorman
2011-07-21 16:28 ` [PATCH 5/8] mm: vmscan: Do not writeback filesystem pages in kswapd except in high priority Mel Gorman
2011-07-31 15:11 ` Minchan Kim
2011-07-21 16:28 ` [PATCH 6/8] mm: vmscan: Throttle reclaim if encountering too many dirty pages under writeback Mel Gorman
2011-07-31 15:17 ` Minchan Kim
2011-08-03 11:19 ` Johannes Weiner
2011-08-03 13:56 ` Mel Gorman
2011-07-21 16:28 ` [PATCH 7/8] mm: vmscan: Immediately reclaim end-of-LRU dirty pages when writeback completes Mel Gorman
2011-07-22 12:53 ` Peter Zijlstra
2011-07-22 13:23 ` Mel Gorman
2011-07-31 15:24 ` Minchan Kim
2011-08-02 11:25 ` Mel Gorman
2011-08-03 11:26 ` Johannes Weiner
2011-08-03 13:57 ` Mel Gorman
2011-07-21 16:28 ` [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from kswapd Mel Gorman
2011-07-22 12:57 ` Peter Zijlstra
2011-07-22 13:31 ` Mel Gorman
2011-08-03 11:37 ` Johannes Weiner
2011-08-03 13:58 ` Mel Gorman [this message]
2011-07-26 11:20 ` [RFC PATCH 0/8] Reduce filesystem writeback from page reclaim v2 Dave Chinner
2011-07-27 4:32 ` Minchan Kim
2011-07-27 7:37 ` Mel Gorman
2011-07-27 16:18 ` Minchan Kim
2011-07-28 11:38 ` Mel Gorman
2011-07-29 9:48 ` Minchan Kim
2011-07-29 9:50 ` Minchan Kim
2011-07-29 13:41 ` Andrew Lutomirski
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20110803135839.GL19099@suse.de \
--to=mgorman@suse.de \
--cc=david@fromorbit.com \
--cc=fengguang.wu@intel.com \
--cc=hch@infradead.org \
--cc=jack@suse.cz \
--cc=jweiner@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=minchan.kim@gmail.com \
--cc=riel@redhat.com \
--cc=xfs@oss.sgi.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).