linux-kernel - Re: writeout stalls in current -git

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Date:	Fri, 2 Nov 2007 22:02:23 +0100
From:	"Torsten Kaiser" <just.for.lkml@...glemail.com>
To:	"David Chinner" <dgc@....com>
Cc:	"Peter Zijlstra" <peterz@...radead.org>,
	"Fengguang Wu" <wfg@...l.ustc.edu.cn>,
	"Maxim Levitsky" <maximlevitsky@...il.com>,
	linux-kernel@...r.kernel.org,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org, xfs@....sgi.com
Subject: Re: writeout stalls in current -git

On 11/2/07, David Chinner <dgc@....com> wrote:
> On Fri, Nov 02, 2007 at 08:22:10PM +0100, Torsten Kaiser wrote:
> > [  630.000000] SysRq : Emergency Sync
> > [  630.120000] Emergency Sync complete
> > [  632.850000] SysRq : Show Blocked State
> > [  632.850000]   task                        PC stack   pid father
> > [  632.850000] pdflush       D ffff81000f091788     0   285      2
> > [  632.850000]  ffff810005d4da80 0000000000000046 0000000000000800
> > 0000007000000001
> > [  632.850000]  ffff81000fd52400 ffffffff8022d61c ffffffff80819b00
> > ffffffff80819b00
> > [  632.850000]  ffffffff80815f40 ffffffff80819b00 ffff810100316f98
> > 0000000000000000
> > [  632.850000] Call Trace:
> > [  632.850000]  [<ffffffff8022d61c>] task_rq_lock+0x4c/0x90
> > [  632.850000]  [<ffffffff8022c8ea>] __wake_up_common+0x5a/0x90
> > [  632.850000]  [<ffffffff805b16e7>] __down+0xa7/0x11e
> > [  632.850000]  [<ffffffff8022da70>] default_wake_function+0x0/0x10
> > [  632.850000]  [<ffffffff805b1365>] __down_failed+0x35/0x3a
> > [  632.850000]  [<ffffffff803752ce>] xfs_buf_lock+0x3e/0x40
> > [  632.850000]  [<ffffffff8037740e>] _xfs_buf_find+0x13e/0x240
> > [  632.850000]  [<ffffffff8037757f>] xfs_buf_get_flags+0x6f/0x190
> > [  632.850000]  [<ffffffff803776b2>] xfs_buf_read_flags+0x12/0xa0
> > [  632.850000]  [<ffffffff80368824>] xfs_trans_read_buf+0x64/0x340
> > [  632.850000]  [<ffffffff80352361>] xfs_itobp+0x81/0x1e0
> > [  632.850000]  [<ffffffff8026b293>] write_cache_pages+0x123/0x330
> > [  632.850000]  [<ffffffff80354d0e>] xfs_iflush+0xfe/0x520
>
> That's stalled waiting on the inode cluster buffer lock. That implies
> that the inode lcuser is already being written out and the inode has
> been redirtied during writeout.
>
> Does the kernel you are testing have the "flush inodes in ascending
> inode number order" patches applied? If so, can you remove that
> patch and see if the problem goes away?

It's 2.6.23-mm1 with only some small fixes.

In it's broken-out directory I see:
git-xfs.patch

and

writeback-fix-periodic-superblock-dirty-inode-flushing.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-2.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-3.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-4.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-5.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-6.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists-7.patch
writeback-fix-time-ordering-of-the-per-superblock-dirty-inode-lists.patch
writeback-fix-time-ordering-of-the-per-superblock-inode-lists-8.patch
writeback-introduce-writeback_controlmore_io-to-indicate-more-io.patch

I don't know if the patch you mentioned is part of that version of the
mm-patchset.

Torsten
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