linux-kernel - Re: bug in elevator/cfq regarding start

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Date:	Tue, 6 Oct 2009 09:12:02 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Corrado Zoccolo <czoccolo@...il.com>
Cc:	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Re: bug in elevator/cfq regarding start_time?

On Mon, Oct 05 2009, Corrado Zoccolo wrote:
> On Mon, Oct 5, 2009 at 5:08 PM, Corrado Zoccolo <czoccolo@...il.com> wrote:
> > On Sun, Oct 4, 2009 at 10:59 PM, Jens Axboe <jens.axboe@...cle.com> wrote:
> >> Good spotting! So we can either add the same copy in cfq, or we can just
> >> move the ->start_time check and assignment in attempt_merge() to post
> >> the elv_merge_requests() call. I think the latter would work fine, but
> >> I'll check and fix tomorrow.
> >
> > I think there is still something buggy regarding those timestamps.
> False alarm. I just found that the list was not yet filled at that
> place in the code.

OK, it did look a bit puzzling. FWIW, this is what I committed
yesterday:

http://git.kernel.dk/?p=linux-2.6-block.git;a=commit;h=30996f40bffe73f05abb92a4cec254befa8cecf7

-- 
Jens Axboe

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