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From: Jens Axboe <jens.axboe@oracle.com>
To: Corrado Zoccolo <czoccolo@gmail.com>
Cc: Linux-Kernel <linux-kernel@vger.kernel.org>,
	Jeff Moyer <jmoyer@redhat.com>, Vivek Goyal <vgoyal@redhat.com>,
	Shaohua Li <shaohua.li@intel.com>,
	Gui Jianfeng <guijianfeng@cn.fujitsu.com>
Subject: Re: [PATCH] cfq-iosched: requests "in flight" vs "in driver" clarification
Date: Sun, 28 Feb 2010 19:44:44 +0100	[thread overview]
Message-ID: <20100228184444.GH5768@kernel.dk> (raw)
In-Reply-To: <1267286589-316-1-git-send-email-czoccolo@gmail.com>

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


  reply	other threads:[~2010-02-28 18:44 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-02-27 16:03 [PATCH] cfq-iosched: requests "in flight" vs "in driver" clarification Corrado Zoccolo
2010-02-28 18:44 ` Jens Axboe [this message]
2010-03-01 14:11 ` Vivek Goyal
  -- strict thread matches above, loose matches on Subject: below --
2009-12-30 21:16 [PATCH] cfq-iosched: replace sync_flight by rq_in_driver[BLK_RW_SYNC] Jens Axboe
2009-12-30 22:24 ` [PATCH] cfq-iosched: requests "in flight" vs "in driver" clarification Corrado Zoccolo

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