linux-kernel - Re: [PATCH 1/2] sched: add wait_for_completion_io[

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Message-ID: <20130215154135.GB3324@gmail.com>
Date:	Fri, 15 Feb 2013 16:41:35 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Vladimir Davydov <vdavydov@...allels.com>
Cc:	Jens Axboe <axboe@...nel.dk>, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>, devel@...nvz.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] sched: add wait_for_completion_io[_timeout]


* Vladimir Davydov <vdavydov@...allels.com> wrote:

> The only difference between wait_for_completion[_timeout]() and
> wait_for_completion_io[_timeout]() is that the latter calls
> io_schedule_timeout() instead of schedule_timeout() so that the caller
> is accounted as waiting for IO, not just sleeping.
> 
> These functions can be used for correct iowait time accounting when the
> completion struct is actually used for waiting for IO (e.g. completion
> of a bio request in the block layer).
> 
> Signed-off-by: Vladimir Davydov <vdavydov@...allels.com>

Acked-by: Ingo Molnar <mingo@...nel.org>

Thanks,

	Ingo
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