Re: Problem with freezable workqueues
From: Nigel Cunningham
Date: Tue Feb 27 2007 - 20:14:37 EST
On Wed, 2007-02-28 at 01:08 +0100, Rafael J. Wysocki wrote:
> On Wednesday, 28 February 2007 01:01, Johannes Berg wrote:
> > On Wed, 2007-02-28 at 00:57 +0100, Rafael J. Wysocki wrote:
> > > Okay, in that case I'd suggest removing create_freezeable_workqueue() and
> > > make all workqueues nonfreezable once again for 2.6.21 (as far as I know, only
> > > the two XFS workqueues are affected).
> > I think Nigel might object but I forgot what specific trouble XFS was
> > causing him.
> We suspected that the XFS' worker threads might commit I/O after
> freeze_processes() has returned, but that hasn't been supported by evidence,
> as far as I can recall.
> Also, making them freezable was controversial ...
Controversy is no reason to give in! Nevertheless, I think you're right
- I believe the XFS guys said they fixed the issue that had caused I/O
to be submitted post-freeze. Well, we'll see if it appears again, won't
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