linux-kernel - Re: [PATCH 6/8] cfq-iosched: move cfq_group determination from cfq_find_alloc_queue() to cfq_get

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Message-ID: <x49y4jtrlz0.fsf@segfault.boston.devel.redhat.com>
Date:	Tue, 09 Jun 2015 10:32:35 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	axboe@...nel.dk, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org, vgoyal@...hat.com,
	avanzini.arianna@...il.com
Subject: Re: [PATCH 6/8] cfq-iosched: move cfq_group determination from cfq_find_alloc_queue() to cfq_get_queue()

Tejun Heo <tj@...nel.org> writes:

> This is necessary for making async cfq_cgroups per-cfq_group instead
> of per-cfq_data.  While this change makes cfq_get_queue() perform RCU
> locking and look up cfq_group even when it reuses async queue, the
> extra overhead is extremely unlikely to be noticeable given that this
> is already sitting behind cic->cfqq[] cache and the overall cost of
> cfq operation.
>
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Cc: Vivek Goyal <vgoyal@...hat.com>
> Cc: Arianna Avanzini <avanzini.arianna@...il.com>

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