Re: [PATCH 04/10] block: initial patch for on-stack per-taskplugging

From: Shaohua Li
Date: Mon Mar 21 2011 - 20:32:21 EST

On Mon, 2011-03-21 at 17:20 +0800, Jens Axboe wrote:
> On 2011-03-21 07:52, Shaohua Li wrote:
> >> Gave it a quick test spin, as suspected it had a few issues. This one
> >> seems to work. Can you toss it through that workload and see if it fares
> >> better?
> > yes, this fully restores the regression I saw. But I have accounting
> > issue:
> Great!
> > 1. The merged request is already accounted when it's added into plug
> > list
> Good catch. I've updated the patch and merged it now, integrating this
> accounting fix.
> > 2. drive_stat_acct() is called without any protection in
> > __make_request(). So there is race for in_flight accounting. The race
> > exists after stack plug is added, so not because of this issue.
> > Below is the extra patch I need to do the test.
> Looks fine. Can I add your signed-off-by to this patch? I'll merge it as
> a separate fix.
Signed-off-by: Shaohua Li<>

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