linux-kernel - Re: [tree] latest kill-the-BKL tree, v12

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Date:	Thu, 16 Apr 2009 02:58:44 +0400
From:	Alexander Beregalov <a.beregalov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Alessio Igor Bogani <abogani@...ware.it>,
	Jeff Mahoney <jeffm@...e.com>,
	ReiserFS Development List <reiserfs-devel@...r.kernel.org>,
	Chris Mason <chris.mason@...cle.com>
Subject: Re: [tree] latest kill-the-BKL tree, v12

2009/4/14 Ingo Molnar <mingo@...e.hu>:
>
> * Alexander Beregalov <a.beregalov@...il.com> wrote:
>
>> On Tue, Apr 14, 2009 at 05:34:22AM +0200, Frederic Weisbecker wrote:
>> > Ingo,
>> >
>> > This small patchset fixes some deadlocks I've faced after trying
>> > some pressures with dbench on a reiserfs partition.
>> >
>> > There is still some work pending such as adding some checks to ensure we
>> > _always_ release the lock before sleeping, as you suggested.
>> > Also I have to fix a lockdep warning reported by Alessio Igor Bogani.
>> > And also some optimizations....
>> >
>> > Thanks,
>> > Frederic.
>> >
>> > Frederic Weisbecker (3):
>> >   kill-the-BKL/reiserfs: provide a tool to lock only once the write lock
>> >   kill-the-BKL/reiserfs: lock only once in reiserfs_truncate_file
>> >   kill-the-BKL/reiserfs: only acquire the write lock once in
>> >     reiserfs_dirty_inode
>> >
>> >  fs/reiserfs/inode.c         |   10 +++++++---
>> >  fs/reiserfs/lock.c          |   26 ++++++++++++++++++++++++++
>> >  fs/reiserfs/super.c         |   15 +++++++++------
>> >  include/linux/reiserfs_fs.h |    2 ++
>> >  4 files changed, 44 insertions(+), 9 deletions(-)
>> >
>>
>> Hi
>>
>> The same test - dbench on reiserfs on loop on sparc64.
>>
>> [ INFO: possible circular locking dependency detected ]
>> 2.6.30-rc1-00457-gb21597d-dirty #2
>
> I'm wondering ... your version hash suggests you used vanilla
> upstream as a base for your test. There's a string of other fixes
> from Frederic in tip:core/kill-the-BKL branch, have you picked them
> all up when you did your testing?
>
> The most coherent way to test this would be to pick up the latest
> core/kill-the-BKL git tree from:
>
>   git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip.git core/kill-the-BKL
>

I did not know about this branch, now I am testing it and
there is no more problem with that testcase (dbench).

I will continue testing.

Thanks.
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