linux-kernel - Re: [PATCH linux-2.6-block/for-linus] Fix discard requests accounting in the diskstats

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Message-ID: <20090424074334.GC4593@kernel.dk>
Date:	Fri, 24 Apr 2009 09:43:34 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Nikanth Karthikesan <knikanth@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, dwmw2@...radead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH linux-2.6-block/for-linus] Fix discard requests
	accounting in the diskstats

On Fri, Apr 24 2009, Nikanth Karthikesan wrote:
> On Friday 24 April 2009 11:45:18 Jens Axboe wrote:
> > On Fri, Apr 24 2009, Nikanth Karthikesan wrote:
> > > When 2 discard requests are merged, the stats gets updated, but we do not
> > > update statistics normally when a discard request is issued or completed.
> > > For example the in_flight counter would be decremented when 2 discard
> > > requests are merged, but it was not at all incremented when they were
> > > issued, and in_flight counter will not be decremented, when they are
> > > completed as well.
> > >
> > > This patch fixes this by adding discard requests to the statistics.
> > >
> > > Signed-off-by: Nikanth Karthikesan <knikanth@...e.de>
> >
> > OK, so that's not quite what I had in mind. If we first do this as a
> > preparatory patch:
> >
> > http://git.kernel.dk/?p=linux-2.6-block.git;a=commit;h=42fd769da4edadad83a7
> >79867ff1910ec35c6de7
> >
> 
> Oh! I thought this cleanup along with the 
> block-turn-some-buggy-macros-into-c-functions.patch from Andrew could be done 
> on top of my original fix. But didn't, as you said, you would do it. Anyway, 
> Thanks.

Refactor and then fix is the cleanest I think. Anyway, queued up for
2.6.31!

-- 
Jens Axboe

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