linux-ext4 - Re: [PATCH 1/3] block: Implement a blk_yield function to voluntarily give up the I/O scheduler.

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Message-ID: <4C24FB84.5050408@kernel.dk>
Date:	Fri, 25 Jun 2010 20:55:00 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Jeff Moyer <jmoyer@...hat.com>
CC:	Vivek Goyal <vgoyal@...hat.com>, linux-kernel@...r.kernel.org,
	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 1/3] block: Implement a blk_yield function to voluntarily
 give up the I/O scheduler.

On 25/06/10 18.51, Jeff Moyer wrote:
>>> +	cfq_log_cfqq(cfqd, cfqq, "yielding queue to %d", tsk->pid);
>>> +	cfqq->yield_to = new_cic;
>>
>> We are stashing away a pointer to cic without taking reference?
> 
> There is no reference counting on the cic.

Not on the cic itself, but on the io context it belongs to. So you
need to grab a reference to that, if you are stowing a reference
to the cic.

-- 
Jens Axboe

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