linux-kernel - Re: [PATCH 1/4] cfq-iosched: algebraic simplification in cfq_prio_to

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Message-ID: <4DDB68C5.4060708@kernel.dk>
Date:	Tue, 24 May 2011 10:13:57 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Namhyung Kim <namhyung@...il.com>
CC:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] cfq-iosched: algebraic simplification in cfq_prio_to_maxrq()

On 2011-05-24 05:18, Namhyung Kim wrote:
> Simplify the calculation in cfq_prio_to_maxrq(), plus replace CFQ_PRIO_LISTS to
> IOPRIO_BE_NR since they are the same and IOPRIO_BE_NR looks more reasonable in
> this context IMHO.

Double checked your math, it is indeed identical to
2*base_rq*IOPRIO_BE_NR - 2*base_rq*cfqq->ioprio. Looks a lot cleaner,
thanks.

-- 
Jens Axboe

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