From: Christoph Hellwig <hch@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Mel Gorman <mel@csn.ul.ie>,
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>
Subject: Re: [PATCH 6/6] vmscan: Do not writeback pages in direct reclaim
Date: Fri, 11 Jun 2010 12:25:23 -0400 [thread overview]
Message-ID: <20100611162523.GA24707@infradead.org> (raw)
In-Reply-To: <20100610231706.1d7528f2.akpm@linux-foundation.org>
On Thu, Jun 10, 2010 at 11:17:06PM -0700, Andrew Morton wrote:
> As it stands, it would be wildly incautious to make a change like
> this without first working out why we're pulling so many dirty pages
> off the LRU tail, and fixing that.
Note that unlike the writepage vs writepages from kswapd which can
be fixed by the right tuning this is a black or white issue. Writeback
from direct reclaim will kill your stack if the caller happens to be
the wrong one, and just making it happen less often is not a fix - it
must not happen at all.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Mel Gorman <mel@csn.ul.ie>,
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>
Subject: Re: [PATCH 6/6] vmscan: Do not writeback pages in direct reclaim
Date: Fri, 11 Jun 2010 12:25:23 -0400 [thread overview]
Message-ID: <20100611162523.GA24707@infradead.org> (raw)
In-Reply-To: <20100610231706.1d7528f2.akpm@linux-foundation.org>
On Thu, Jun 10, 2010 at 11:17:06PM -0700, Andrew Morton wrote:
> As it stands, it would be wildly incautious to make a change like
> this without first working out why we're pulling so many dirty pages
> off the LRU tail, and fixing that.
Note that unlike the writepage vs writepages from kswapd which can
be fixed by the right tuning this is a black or white issue. Writeback
from direct reclaim will kill your stack if the caller happens to be
the wrong one, and just making it happen less often is not a fix - it
must not happen at all.
--
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next prev parent reply other threads:[~2010-06-11 16:25 UTC|newest]
Thread overview: 134+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-08 9:02 [RFC PATCH 0/6] Do not call ->writepage[s] from direct reclaim and use a_ops->writepages() where possible Mel Gorman
2010-06-08 9:02 ` Mel Gorman
2010-06-08 9:02 ` [PATCH 1/6] tracing, vmscan: Add trace events for kswapd wakeup, sleeping and direct reclaim Mel Gorman
2010-06-08 9:02 ` Mel Gorman
2010-06-08 9:02 ` [PATCH 2/6] tracing, vmscan: Add trace events for LRU page isolation Mel Gorman
2010-06-08 9:02 ` Mel Gorman
2010-06-08 9:02 ` [PATCH 3/6] tracing, vmscan: Add trace event when a page is written Mel Gorman
2010-06-08 9:02 ` Mel Gorman
2010-06-08 9:02 ` [PATCH 4/6] tracing, vmscan: Add a postprocessing script for reclaim-related ftrace events Mel Gorman
2010-06-08 9:02 ` Mel Gorman
2010-06-08 9:02 ` [PATCH 5/6] vmscan: Write out ranges of pages contiguous to the inode where possible Mel Gorman
2010-06-08 9:02 ` Mel Gorman
2010-06-11 6:10 ` Andrew Morton
2010-06-11 6:10 ` Andrew Morton
2010-06-11 12:49 ` Mel Gorman
2010-06-11 12:49 ` Mel Gorman
2010-06-11 19:07 ` Andrew Morton
2010-06-11 19:07 ` Andrew Morton
2010-06-11 20:44 ` Mel Gorman
2010-06-11 20:44 ` Mel Gorman
2010-06-11 21:33 ` Andrew Morton
2010-06-11 21:33 ` Andrew Morton
2010-06-12 0:17 ` Mel Gorman
2010-06-12 0:17 ` Mel Gorman
2010-06-11 16:27 ` Christoph Hellwig
2010-06-11 16:27 ` Christoph Hellwig
2010-06-08 9:02 ` [PATCH 6/6] vmscan: Do not writeback pages in direct reclaim Mel Gorman
2010-06-08 9:02 ` Mel Gorman
2010-06-11 6:17 ` Andrew Morton
2010-06-11 6:17 ` Andrew Morton
2010-06-11 12:54 ` Mel Gorman
2010-06-11 12:54 ` Mel Gorman
2010-06-11 16:25 ` Christoph Hellwig [this message]
2010-06-11 16:25 ` Christoph Hellwig
2010-06-11 17:43 ` Andrew Morton
2010-06-11 17:43 ` Andrew Morton
2010-06-11 17:49 ` Christoph Hellwig
2010-06-11 17:49 ` Christoph Hellwig
2010-06-11 18:13 ` Mel Gorman
2010-06-11 18:13 ` Mel Gorman
2010-06-08 9:08 ` [RFC PATCH 0/6] Do not call ->writepage[s] from direct reclaim and use a_ops->writepages() where possible Christoph Hellwig
2010-06-08 9:08 ` Christoph Hellwig
2010-06-08 9:28 ` Mel Gorman
2010-06-08 9:28 ` Mel Gorman
2010-06-11 16:29 ` Christoph Hellwig
2010-06-11 16:29 ` Christoph Hellwig
2010-06-11 18:15 ` Mel Gorman
2010-06-11 18:15 ` Mel Gorman
2010-06-11 19:12 ` Chris Mason
2010-06-11 19:12 ` Chris Mason
2010-06-09 2:52 ` KAMEZAWA Hiroyuki
2010-06-09 2:52 ` KAMEZAWA Hiroyuki
2010-06-09 9:52 ` Mel Gorman
2010-06-09 9:52 ` Mel Gorman
2010-06-10 0:38 ` KAMEZAWA Hiroyuki
2010-06-10 0:38 ` KAMEZAWA Hiroyuki
2010-06-10 1:10 ` Mel Gorman
2010-06-10 1:10 ` Mel Gorman
2010-06-10 1:29 ` KAMEZAWA Hiroyuki
2010-06-10 1:29 ` KAMEZAWA Hiroyuki
2010-06-11 5:57 ` Andrew Morton
2010-06-11 5:57 ` Andrew Morton
2010-06-11 12:33 ` Mel Gorman
2010-06-11 12:33 ` Mel Gorman
2010-06-11 16:30 ` Christoph Hellwig
2010-06-11 16:30 ` Christoph Hellwig
2010-06-11 18:17 ` Mel Gorman
2010-06-11 18:17 ` Mel Gorman
2010-06-15 14:00 ` Andrea Arcangeli
2010-06-15 14:00 ` Andrea Arcangeli
2010-06-15 14:11 ` Christoph Hellwig
2010-06-15 14:11 ` Christoph Hellwig
2010-06-15 14:22 ` Andrea Arcangeli
2010-06-15 14:22 ` Andrea Arcangeli
2010-06-15 14:43 ` Christoph Hellwig
2010-06-15 14:43 ` Christoph Hellwig
2010-06-15 15:08 ` Andrea Arcangeli
2010-06-15 15:08 ` Andrea Arcangeli
2010-06-15 15:25 ` Christoph Hellwig
2010-06-15 15:25 ` Christoph Hellwig
2010-06-15 15:45 ` Andrea Arcangeli
2010-06-15 15:45 ` Andrea Arcangeli
2010-06-15 16:26 ` Christoph Hellwig
2010-06-15 16:26 ` Christoph Hellwig
2010-06-15 16:31 ` Andrea Arcangeli
2010-06-15 16:31 ` Andrea Arcangeli
2010-06-15 16:49 ` Rik van Riel
2010-06-15 16:49 ` Rik van Riel
2010-06-15 16:54 ` Christoph Hellwig
2010-06-15 16:54 ` Christoph Hellwig
2010-06-15 19:13 ` Rik van Riel
2010-06-15 19:13 ` Rik van Riel
2010-06-15 19:17 ` Christoph Hellwig
2010-06-15 19:17 ` Christoph Hellwig
2010-06-15 19:44 ` Chris Mason
2010-06-15 19:44 ` Chris Mason
2010-06-16 7:57 ` Nick Piggin
2010-06-16 7:57 ` Nick Piggin
2010-06-16 16:59 ` Rik van Riel
2010-06-16 16:59 ` Rik van Riel
2010-06-16 17:04 ` Andrea Arcangeli
2010-06-16 17:04 ` Andrea Arcangeli
2010-06-15 16:54 ` Nick Piggin
2010-06-15 16:54 ` Nick Piggin
2010-06-15 15:38 ` Mel Gorman
2010-06-15 15:38 ` Mel Gorman
2010-06-15 16:14 ` Andrea Arcangeli
2010-06-15 16:14 ` Andrea Arcangeli
2010-06-15 16:22 ` Christoph Hellwig
2010-06-15 16:22 ` Christoph Hellwig
2010-06-15 16:30 ` Mel Gorman
2010-06-15 16:30 ` Mel Gorman
2010-06-15 16:34 ` Mel Gorman
2010-06-15 16:34 ` Mel Gorman
2010-06-15 16:54 ` Andrea Arcangeli
2010-06-15 16:54 ` Andrea Arcangeli
2010-06-15 16:35 ` Christoph Hellwig
2010-06-15 16:35 ` Christoph Hellwig
2010-06-15 16:37 ` Andrea Arcangeli
2010-06-15 16:37 ` Andrea Arcangeli
2010-06-15 17:43 ` Christoph Hellwig
2010-06-15 17:43 ` Christoph Hellwig
2010-06-15 16:45 ` Christoph Hellwig
2010-06-15 16:45 ` Christoph Hellwig
2010-06-15 14:51 ` Mel Gorman
2010-06-15 14:51 ` Mel Gorman
2010-06-15 14:55 ` Rik van Riel
2010-06-15 14:55 ` Rik van Riel
2010-06-15 15:08 ` Nick Piggin
2010-06-15 15:08 ` Nick Piggin
2010-06-15 15:10 ` Mel Gorman
2010-06-15 15:10 ` Mel Gorman
2010-06-15 16:28 ` Andrea Arcangeli
2010-06-15 16:28 ` Andrea Arcangeli
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