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Re: [PATCH 5/9] xfs: reduce the number of AIL push wakeups

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH 5/9] xfs: reduce the number of AIL push wakeups
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Thu, 16 Dec 2010 19:23:07 -0500
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <20101216215050.GA5193@dastard>
References: <1292214743-18073-1-git-send-email-david@xxxxxxxxxxxxx> <1292214743-18073-6-git-send-email-david@xxxxxxxxxxxxx> <20101216153846.GC24185@xxxxxxxxxxxxx> <20101216215050.GA5193@dastard>
User-agent: Mutt/1.5.21 (2010-09-15)
On Fri, Dec 17, 2010 at 08:50:50AM +1100, Dave Chinner wrote:
> What tests?

I couldn't really see a pattern yet - it's different ones and different
amount of warnings during each run.

> So this is saying is that a 20ms uninterruptible sleep lasting for more
> than 120s? Doesn't that imply some kind of scheduler starvation, not
> an actual XFS problem?

It does for sure look odd to me.  I'll do a sub-commit bisect between
the two hunk in the patch tomorrow to drill a bit deeper into what's
going on.

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