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

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Date:	Fri, 9 Aug 2013 17:07:45 +0200
From:	Alexander Gordeev <agordeev@...hat.com>
To:	Jens Axboe <axboe@...nel.dk>
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 Fri, Aug 09, 2013 at 08:24:38AM -0600, Jens Axboe wrote:
> On 08/09/2013 02:23 AM, Alexander Gordeev wrote:
> > +	ap->qc_tags = blk_mq_init_tags(ATA_MAX_QUEUE, 1, NUMA_NO_NODE);
> > +	if (!ap->qc_tags) {
> > +		kfree(ap);
> > +		return NULL;
> > +	}
> 
> This should be blk_mq_init_tags(ATA_MAX_QUEUE - 1, 1, ...) since the
> total depth is normal_tags + reserved_tags.

Aha.. If blk_mq_init_tags() should be like this then?

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++;
 	}

> -- 
> Jens Axboe

-- 
Regards,
Alexander Gordeev
agordeev@...hat.com
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