linux-kernel - Re: pdflush stuck in D state with v2.6.24-rc1-192-gef49c32

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Date:	Wed, 31 Oct 2007 14:53:25 +0800
From:	Fengguang Wu <wfg@...l.ustc.edu.cn>
To:	Florin Iucha <florin@...ha.net>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Trond Myklebust <trond.myklebust@....uio.no>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: pdflush stuck in D state with v2.6.24-rc1-192-gef49c32

On Tue, Oct 30, 2007 at 10:52:45PM -0500, Florin Iucha wrote:
> On Tue, Oct 30, 2007 at 07:02:42PM -0500, Florin Iucha wrote:
> > I have added the patches and started a linux kernel compilation, and
> > something really interesting happens.  I run the build with the
> > equivalent of "make -j3" and in a separate console I am watching the
> > build with 'top'.  The build consumes 98% of both CPUs.  If I stop the
> > output in the build console with "Ctrl-S", one core goes to idle,
> > while the other is in 50% waiting, then goes to 75% waiting.  When I
> > resume the build with "Ctrl-Q", the build starts to use both CPUs at
> > 98-99%.  The NFS4 use was minimal, as I did not login with Gnome, but
> > just logged on the console.  Also, the CPU that is in 75% waiting
> > state changes occasionally.  'Top' shows pdflush in D state, using
> > 5-6% of CPU.
> 
> I forgot the traces:
> 
>    http://iucha.net/2.6.24-rc1/fw.1.gz
>    http://iucha.net/2.6.24-rc1/fw.2.gz
>    http://iucha.net/2.6.24-rc1/fw.3.gz

Sorry for the delay - I've been fixing our server today.

[  263.685691] mm/page-writeback.c 655 wb_kupdate: pdflush(248) 24235 global 4593 0 0 wc _M tw 1024 sk 0
[  263.789648] requeue_io 301: inode 4031199 size 562 at 08:07(sda7)
[  263.789656] requeue_io 301: inode 4031231 size 329 at 08:07(sda7)
[  263.789660] requeue_io 301: inode 4031255 size 177 at 08:07(sda7)
[  263.789664] requeue_io 301: inode 4031268 size 94 at 08:07(sda7)
[  263.789667] requeue_io 301: inode 4031329 size 88 at 08:07(sda7)
[  263.789671] requeue_io 301: inode 4031351 size 74 at 08:07(sda7)
[  263.789674] requeue_io 301: inode 4031408 size 175 at 08:07(sda7)
[  263.789678] requeue_io 301: inode 4031413 size 129 at 08:07(sda7)
[  263.789681] requeue_io 301: inode 4031415 size 391 at 08:07(sda7)
[  263.789690] mm/page-writeback.c 655 wb_kupdate: pdflush(248) 24235 global 4593 0 0 wc _M tw 1024 sk 0
[  263.890184] requeue_io 301: inode 4031199 size 562 at 08:07(sda7)
[  263.890191] requeue_io 301: inode 4031231 size 329 at 08:07(sda7)
[  263.890195] requeue_io 301: inode 4031255 size 177 at 08:07(sda7)
[  263.890198] requeue_io 301: inode 4031268 size 94 at 08:07(sda7)
[  263.890202] requeue_io 301: inode 4031329 size 88 at 08:07(sda7)
[  263.890205] requeue_io 301: inode 4031351 size 74 at 08:07(sda7)
[  263.890208] requeue_io 301: inode 4031408 size 175 at 08:07(sda7)
[  263.890212] requeue_io 301: inode 4031413 size 129 at 08:07(sda7)
[  263.890215] requeue_io 301: inode 4031415 size 391 at 08:07(sda7)
[  263.890223] mm/page-writeback.c 655 wb_kupdate: pdflush(248) 24235 global 4593 0 0 wc _M tw 1024 sk 0

It's about sda7, not NFSv4.

Is it a Reiserfs? We have a fresh fix for it: http://lkml.org/lkml/2007/10/23/93

Thank you,
Fengguang

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