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

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Date:	Thu, 23 Dec 2010 10:26:29 -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 2/2]block cfq: don't use atomic_t for cfq_group

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

> cfq_group->ref is used with queue_lock hold, the only exception is
> cfq_set_request, which looks like a bug to me, 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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