linux-kernel - Re: [PATCH 1/2]block cfq: don't use atomic_t for cfq

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Message-ID: <x49vd2k7cnq.fsf@segfault.boston.devel.redhat.com>
Date:	Thu, 23 Dec 2010 10:05:13 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Jens Axboe <jaxboe@...ionio.com>, vgoyal@...hat.com
Subject: Re: [PATCH 1/2]block cfq: don't use atomic_t for cfq_queue

Shaohua Li <shaohua.li@...el.com> writes:

> cfq_queue->ref is used with queue_lock hold, so ref doesn't need to be an atomic
> and atomic operation is slower.
>
> Signed-off-by: Shaohua Li <shaohua.li@...el.com>

Reviewed-by: Jeff Moyer <jmoyer@...hat.com>
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