From: Johannes Weiner <jweiner@redhat.com>
To: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>, Jan Kara <jack@suse.cz>,
LKML <linux-kernel@vger.kernel.org>, XFS <xfs@oss.sgi.com>,
Christoph Hellwig <hch@infradead.org>,
Linux-MM <linux-mm@kvack.org>,
Minchan Kim <minchan.kim@gmail.com>,
Wu Fengguang <fengguang.wu@intel.com>
Subject: Re: [PATCH 8/8] mm: vmscan: Do not writeback filesystem pages from kswapd
Date: Wed, 3 Aug 2011 13:37:06 +0200 [thread overview]
Message-ID: <20110803113706.GF27199@redhat.com> (raw)
In-Reply-To: <1311265730-5324-9-git-send-email-mgorman@suse.de>
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.
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.
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>
_______________________________________________
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xfs@oss.sgi.com
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WARNING: multiple messages have this Message-ID (diff)
From: Johannes Weiner <jweiner@redhat.com>
To: Mel Gorman <mgorman@suse.de>
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 13:37:06 +0200 [thread overview]
Message-ID: <20110803113706.GF27199@redhat.com> (raw)
In-Reply-To: <1311265730-5324-9-git-send-email-mgorman@suse.de>
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.
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.
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>
WARNING: multiple messages have this Message-ID (diff)
From: Johannes Weiner <jweiner@redhat.com>
To: Mel Gorman <mgorman@suse.de>
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 13:37:06 +0200 [thread overview]
Message-ID: <20110803113706.GF27199@redhat.com> (raw)
In-Reply-To: <1311265730-5324-9-git-send-email-mgorman@suse.de>
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.
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.
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>
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next prev parent reply other threads:[~2011-08-03 11:37 UTC|newest]
Thread overview: 129+ 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 ` Mel Gorman
2011-07-21 16:28 ` Mel Gorman
2011-07-21 16:28 ` [PATCH 1/8] mm: vmscan: Do not writeback filesystem pages in direct reclaim Mel Gorman
2011-07-21 16:28 ` Mel Gorman
2011-07-21 16:28 ` Mel Gorman
2011-07-31 15:06 ` Minchan Kim
2011-07-31 15:06 ` Minchan Kim
2011-07-31 15:06 ` Minchan Kim
2011-08-02 11:21 ` Mel Gorman
2011-08-02 11:21 ` Mel Gorman
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
2011-07-21 16:28 ` Mel Gorman
2011-07-21 16:28 ` Mel Gorman
2011-07-24 11:32 ` Christoph Hellwig
2011-07-24 11:32 ` Christoph Hellwig
2011-07-24 11:32 ` Christoph Hellwig
2011-07-25 8:19 ` Mel Gorman
2011-07-25 8:19 ` Mel Gorman
2011-07-25 8:19 ` Mel Gorman
2011-07-21 16:28 ` [PATCH 3/8] ext4: " Mel Gorman
2011-07-21 16:28 ` Mel Gorman
2011-07-21 16:28 ` Mel Gorman
2011-08-03 10:58 ` Johannes Weiner
2011-08-03 10:58 ` Johannes Weiner
2011-08-03 10:58 ` Johannes Weiner
2011-08-03 11:06 ` Johannes Weiner
2011-08-03 11:06 ` Johannes Weiner
2011-08-03 11:06 ` Johannes Weiner
2011-08-03 13:44 ` Mel Gorman
2011-08-03 13:44 ` Mel Gorman
2011-08-03 13:44 ` Mel Gorman
2011-08-03 14:00 ` Johannes Weiner
2011-08-03 14:00 ` Johannes Weiner
2011-08-03 14:00 ` Johannes Weiner
2011-08-03 14:18 ` Christoph Hellwig
2011-08-03 14:18 ` Christoph Hellwig
2011-08-03 14:18 ` Christoph Hellwig
2011-08-03 14:35 ` Mel Gorman
2011-08-03 14:35 ` Mel Gorman
2011-08-03 14:35 ` Mel Gorman
2011-07-21 16:28 ` [PATCH 4/8] btrfs: " Mel Gorman
2011-07-21 16:28 ` Mel Gorman
2011-07-21 16:28 ` Mel Gorman
2011-08-03 11:10 ` Johannes Weiner
2011-08-03 11:10 ` Johannes Weiner
2011-08-03 11:10 ` Johannes Weiner
2011-08-03 13:45 ` Mel Gorman
2011-08-03 13:45 ` Mel Gorman
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
2011-07-21 16:28 ` Mel Gorman
2011-07-21 16:28 ` Mel Gorman
2011-07-31 15:11 ` Minchan Kim
2011-07-31 15:11 ` Minchan Kim
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
2011-07-21 16:28 ` Mel Gorman
2011-07-21 16:28 ` Mel Gorman
2011-07-31 15:17 ` Minchan Kim
2011-07-31 15:17 ` Minchan Kim
2011-07-31 15:17 ` Minchan Kim
2011-08-03 11:19 ` Johannes Weiner
2011-08-03 11:19 ` Johannes Weiner
2011-08-03 11:19 ` Johannes Weiner
2011-08-03 13:56 ` Mel Gorman
2011-08-03 13:56 ` Mel Gorman
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
2011-07-21 16:28 ` Mel Gorman
2011-07-21 16:28 ` Mel Gorman
2011-07-22 12:53 ` Peter Zijlstra
2011-07-22 12:53 ` Peter Zijlstra
2011-07-22 12:53 ` Peter Zijlstra
2011-07-22 13:23 ` Mel Gorman
2011-07-22 13:23 ` Mel Gorman
2011-07-22 13:23 ` Mel Gorman
2011-07-31 15:24 ` Minchan Kim
2011-07-31 15:24 ` Minchan Kim
2011-07-31 15:24 ` Minchan Kim
2011-08-02 11:25 ` Mel Gorman
2011-08-02 11:25 ` Mel Gorman
2011-08-02 11:25 ` Mel Gorman
2011-08-03 11:26 ` Johannes Weiner
2011-08-03 11:26 ` Johannes Weiner
2011-08-03 11:26 ` Johannes Weiner
2011-08-03 13:57 ` Mel Gorman
2011-08-03 13:57 ` Mel Gorman
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
2011-07-21 16:28 ` Mel Gorman
2011-07-21 16:28 ` Mel Gorman
2011-07-22 12:57 ` Peter Zijlstra
2011-07-22 12:57 ` Peter Zijlstra
2011-07-22 12:57 ` Peter Zijlstra
2011-07-22 13:31 ` Mel Gorman
2011-07-22 13:31 ` Mel Gorman
2011-07-22 13:31 ` Mel Gorman
2011-08-03 11:37 ` Johannes Weiner [this message]
2011-08-03 11:37 ` Johannes Weiner
2011-08-03 11:37 ` Johannes Weiner
2011-08-03 13:58 ` Mel Gorman
2011-08-03 13:58 ` Mel Gorman
2011-08-03 13:58 ` Mel Gorman
2011-07-26 11:20 ` [RFC PATCH 0/8] Reduce filesystem writeback from page reclaim v2 Dave Chinner
2011-07-26 11:20 ` Dave Chinner
2011-07-26 11:20 ` Dave Chinner
2011-07-27 4:32 ` Minchan Kim
2011-07-27 4:32 ` Minchan Kim
2011-07-27 4:32 ` Minchan Kim
2011-07-27 7:37 ` Mel Gorman
2011-07-27 7:37 ` Mel Gorman
2011-07-27 7:37 ` Mel Gorman
2011-07-27 16:18 ` Minchan Kim
2011-07-27 16:18 ` Minchan Kim
2011-07-27 16:18 ` Minchan Kim
2011-07-28 11:38 ` Mel Gorman
2011-07-28 11:38 ` Mel Gorman
2011-07-28 11:38 ` Mel Gorman
2011-07-29 9:48 ` Minchan Kim
2011-07-29 9:48 ` Minchan Kim
2011-07-29 9:48 ` Minchan Kim
2011-07-29 9:50 ` Minchan Kim
2011-07-29 9:50 ` Minchan Kim
2011-07-29 9:50 ` Minchan Kim
2011-07-29 13:41 ` Andrew Lutomirski
2011-07-29 13:41 ` Andrew Lutomirski
2011-07-29 13:41 ` Andrew Lutomirski
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