From: David Chinner <dgc@sgi.com>
To: Andi Kleen <ak@suse.de>
Cc: xfs@oss.sgi.com
Subject: Re: XFS thread inflation in 2.6.23rc
Date: Wed, 8 Aug 2007 22:13:59 +1000 [thread overview]
Message-ID: <20070808121359.GP52011508@sgi.com> (raw)
In-Reply-To: <200708081240.21548.ak@suse.de>
On Wed, Aug 08, 2007 at 12:40:21PM +0200, Andi Kleen wrote:
>
> In 2.6.23rc I have a new kernel thread running from XFS:
>
> 30137 ? S< 0:00 [xfs_mru_cache]
>
> Is that one really needed? Can it be started only on demand when that MRU
> feature is used?
It uses a single threaded workqueue for reaping objects and the thread comes
along with that. Creating the workqueue on demand would require creating a
kernel thread inside a transaction and that's not some thing we want to do.
It can't really be put into an existing thread/workqueue because of
deadlock problems which is why it has it's own workqueue....
Besides, what's the point of having nice constructs like dedicated
workqueues if people complain when they get used to solve problems?
Cheers,
Dave.
--
Dave Chinner
Principal Engineer
SGI Australian Software Group
next prev parent reply other threads:[~2007-08-08 12:14 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-08 10:40 XFS thread inflation in 2.6.23rc Andi Kleen
2007-08-08 12:13 ` David Chinner [this message]
2007-08-08 12:22 ` Andi Kleen
2007-08-08 13:14 ` David Chinner
2007-08-08 13:26 ` Andi Kleen
2007-08-09 11:03 ` David Chinner
2007-08-10 19:34 ` Eric Sandeen
2007-08-10 23:49 ` David Chinner
2007-08-11 1:21 ` Eric Sandeen
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