linux-kernel - Re: [PATCH RESEND] block: Don't check QUEUE_FLAG_SAME_COMP in __blk_complete

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Date:	Thu, 15 Sep 2011 22:48:19 +0800
From:	Tao Ma <tm@....ma>
To:	Jens Axboe <jaxboe@...ionio.com>
CC:	Christoph Hellwig <hch@...radead.org>,
	Shaohua Li <shli@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND] block: Don't check QUEUE_FLAG_SAME_COMP in __blk_complete_request.

On 09/15/2011 07:28 PM, Jens Axboe wrote:
> On 2011-09-15 13:17, Christoph Hellwig wrote:
>> On Thu, Sep 15, 2011 at 10:16:02AM +0800, Tao Ma wrote:
>>>> why not delete bio_set_completion_cpu()?
>>> Not sure. It is added in commit c7c22e4d from the very beginning, and in
>>> the commit log Jens described it as:
>>> A bio helper (bio_set_completion_cpu()) is also added, so that queuers
>>> can ask for completion on that specific CPU. Maybe it is obsolete.
>>> Anyway, I am fine to generate a patch to remove it if you prefer.
>>>> 1. nobody uses it in my search
>>> yes, but it may be designed for someone to use it. The same goes with
>>> BIO_CPU_AFFINE.
>>
>> This code is unused, and from the all the discussions lately pretty
>> obviously broken.  The only thing keeping it serves is creating more
>> confusion and possibly more bugs.
> 
> We can kill bio_set_completion_cpu(). I'm fine with leaving cpu control
> to the request based drivers, they are the only ones that can toggle the
> setting anyway.
So we should remove bio_comp_cpu and BIO_CPU_AFFINE also if we have
decided to only leave cpu control to the request based drivers, right?

I will generate a patch for it later.

Thanks
Tao
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