linux-kernel - Re: [PATCH] blk-cgroup: Initialize ioc->cgroup

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Message-ID: <4DDA9AFF.3080400@fusionio.com>
Date:	Mon, 23 May 2011 19:35:59 +0200
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Paul Bolle <pebolle@...cali.nl>
Subject: Re: [PATCH] blk-cgroup: Initialize ioc->cgroup_changed at ioc creation
  time

On 2011-05-23 16:55, Vivek Goyal wrote:
> If we don't explicitly initialize it to zero, CFQ might think that
> cgroup of ioc has changed and it generates lots of unnecessary calls
> to call_for_each_cic(changed_cgroup). Fix it.
> 
> cfq_get_io_context()
>   cfq_ioc_set_cgroup()
>      call_for_each_cic(ioc, changed_cgroup)

Thanks Vivek, applied.

-- 
Jens Axboe

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