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: <x496316opgg.fsf@segfault.boston.devel.redhat.com>
Date:	Fri, 25 Jun 2010 15:57:19 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Jens Axboe <axboe@...nel.dk>
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.

Jens Axboe <axboe@...nel.dk> writes:

> 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.

OK, easy enough.  Thanks!

Jeff
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