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

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Date:	Fri, 09 Aug 2013 08:24:38 -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 02:23 AM, Alexander Gordeev wrote:
> On Mon, Jul 29, 2013 at 07:46:53AM -0400, Tejun Heo wrote:
>> One thing which would probably be worthwhile tho is getting rid of the
>> bitmap based qc tag allocator in libata.  That one is just borderline
>> stupid to keep around on any setup which is supposed to be scalable.
> 
> Hi Tejun,
> 
> How about this approach?
> 
> @@ -5639,6 +5627,12 @@ struct ata_port *ata_port_alloc(struct ata_host *host)
>  	if (!ap)
>  		return NULL;
>  
> +	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. Apart from that, I think it
looks alright based on a cursory look.

-- 
Jens Axboe

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