linux-kernel - Re: [GIT PULL] ext4 update for 2.6.39-rc1

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Message-ID: <20110325172446.GH1409@htj.dyndns.org>
Date:	Fri, 25 Mar 2011 18:24:46 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, sfr@...b.auug.org.au
Subject: Re: [GIT PULL] ext4 update for 2.6.39-rc1

Hello, Linus.

On Fri, Mar 25, 2011 at 10:02:48AM -0700, Linus Torvalds wrote:
> Ok, guys, can you verify my merge? In one branch, we had Tejun change
> it to use "alloc_workqueue()", and in another, ext4 switched from
> create_workqueue() to create_singlethread_workqueue().
> 
> My resolution was to use WQ_UNBOUND in allow_workqueue() in the
> resulting merge, which I think should be semantically the correct
> resolve. But the commit message in the create_singlethread_workqueue()
> change seems to imply that the single-threadedness isn't a
> _correctness_ issue as much as it is just a "we don't need multiple
> threads" issue, so maybe the WQ_UNBOUND isn't necessary. So WQ_UNBOUND
> may or may not be a good idea.
> 
> Regardless, please give it a look, ok?

The merg should be safe but WQ_UNBOUND isn't necessary there, so I
think the version from commit fd89d5f2030a ("ext4: convert to
alloc_workqueue()") would be better.  BTW, Stephen already spotted
this earlier today - https://lkml.org/lkml/2011/3/24/652

Thanks.

-- 
tejun
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