linux-kernel - Re: [PATCH] cfq-iosched: requests "in flight" vs "in driver" clarification

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Message-ID: <20100228184444.GH5768@kernel.dk>
Date:	Sun, 28 Feb 2010 19:44:44 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Corrado Zoccolo <czoccolo@...il.com>
Cc:	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Jeff Moyer <jmoyer@...hat.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Shaohua Li <shaohua.li@...el.com>,
	Gui Jianfeng <guijianfeng@...fujitsu.com>
Subject: Re: [PATCH] cfq-iosched: requests "in flight" vs "in driver"
	clarification

On Sat, Feb 27 2010, Corrado Zoccolo wrote:
> Counters for requests "in flight" and "in driver" are used asymmetrically
> in cfq_may_dispatch, and have slightly different meaning.
> We split the rq_in_flight counter (was sync_flight) to count both sync
> and async requests, in order to use this one, which is more accurate in
> some corner cases.
> The rq_in_driver counter is coalesced, since individual sync/async counts
> are not used any more.

Thanks, applied.

-- 
Jens Axboe

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