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From: Ingo Molnar <mingo@kernel.org>
To: Vladimir Davydov <vdavydov@parallels.com>
Cc: Jens Axboe <axboe@kernel.dk>, Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	devel@openvz.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] sched: add wait_for_completion_io[_timeout]
Date: Fri, 15 Feb 2013 16:41:35 +0100	[thread overview]
Message-ID: <20130215154135.GB3324@gmail.com> (raw)
In-Reply-To: <d5e5c32b045e448072b3a4b77cd6557408b77103.1360851174.git.vdavydov@parallels.com>


* Vladimir Davydov <vdavydov@parallels.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@parallels.com>

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

Thanks,

	Ingo

      parent reply	other threads:[~2013-02-15 15:41 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-02-14 14:19 [PATCH 1/2] sched: add wait_for_completion_io[_timeout] Vladimir Davydov
2013-02-14 14:19 ` [PATCH 2/2] block: account iowait time when waiting for completion of IO request Vladimir Davydov
2013-02-15 15:44   ` Jens Axboe
2013-02-15 15:41 ` Ingo Molnar [this message]

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