linux-kernel - Re: [PATCH RESEND 0/1] AHCI: Optimize interrupt processing

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Date:	Fri, 09 Aug 2013 11:07:37 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Alexander Gordeev <agordeev@...hat.com>
CC:	Tejun Heo <tj@...nel.org>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Mike Christie <michaelc@...wisc.edu>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	Jeff Garzik <jgarzik@...ox.com>,
	linux-scsi <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH RESEND 0/1] AHCI: Optimize interrupt processing

On 08/09/2013 10:46 AM, Alexander Gordeev wrote:
> On Fri, Aug 09, 2013 at 09:52:19AM -0600, Jens Axboe wrote:
>> On 08/09/2013 09:07 AM, Alexander Gordeev wrote:
>>> diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
>>> index dcbc2a4..b131a48 100644
>>> --- a/block/blk-mq-tag.c
>>> +++ b/block/blk-mq-tag.c
>>> @@ -468,10 +468,9 @@ struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags,
>>>  	 * Rest of the tags start at the queue list
>>>  	 */
>>>  	tags->nr_free = 0;
>>> -	while (nr_tags - tags->nr_reserved) {
>>> +	while (nr_tags--) {
>>>  		tags->freelist[tags->nr_free] = tags->nr_free +
>>>  							tags->nr_reserved;
>>> -		nr_tags--;
>>>  		tags->nr_free++;
>>>  	}
>>
>> I misremembered, just checked the code. I think I used to have it like I
>> described, but changed it since I thought it would be more logical to
>> pass in full depth, and then what part of that is reserved. Looking at
>> the current code, your patch looks correct as-is.
> 
> Ok, then a whole series "[PATCH 0/3] blk-mq: Avoid effects of a weird queue
> depth" (I posted earlier in a separate thread) should make sense. Besides
> the hunk above it limits the per-cpu cache size and sanity-checks total vs
> reserved length. I can resubmit if you want.

You don't have to resubmit, I'll get it reviewed and applied today.

-- 
Jens Axboe

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