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From: Keith Busch <keith.busch@intel.com>
To: Christoph Hellwig <hch@lst.de>
Cc: axboe@fb.com, linux-block@vger.kernel.org,
	linux-nvme@lists.infradead.org
Subject: Re: [PATCH 4/7] blk-mq: allow the driver to pass in an affinity mask
Date: Wed, 31 Aug 2016 12:38:53 -0400	[thread overview]
Message-ID: <20160831163852.GB5598@localhost.localdomain> (raw)
In-Reply-To: <1472468013-29936-5-git-send-email-hch@lst.de>

On Mon, Aug 29, 2016 at 12:53:30PM +0200, Christoph Hellwig wrote:
> +static int blk_mq_create_mq_map(struct blk_mq_tag_set *set,
> +		const struct cpumask *affinity_mask)
> +{
> +	int queue = -1, cpu = 0;
> +
> +	set->mq_map = kzalloc_node(sizeof(*set->mq_map) * nr_cpu_ids,
> +			GFP_KERNEL, set->numa_node);
> +	if (!set->mq_map)
> +		return -ENOMEM;
> +
> +	if (!affinity_mask)
> +		return 0;	/* map all cpus to queue 0 */
> +
> +	/* If cpus are offline, map them to first hctx */
> +	for_each_online_cpu(cpu) {
> +		if (cpumask_test_cpu(cpu, affinity_mask))
> +			queue++;
> +		if (queue >= 0)
> +			set->mq_map[cpu] = queue;
> +	}

This can't be right. We have a single affinity mask for the entire
set, but what I think we want is an one affinity mask for each
nr_io_queues. The irq_create_affinity_mask should then create an array
of cpumasks based on nr_vecs..

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WARNING: multiple messages have this Message-ID (diff)
From: keith.busch@intel.com (Keith Busch)
Subject: [PATCH 4/7] blk-mq: allow the driver to pass in an affinity mask
Date: Wed, 31 Aug 2016 12:38:53 -0400	[thread overview]
Message-ID: <20160831163852.GB5598@localhost.localdomain> (raw)
In-Reply-To: <1472468013-29936-5-git-send-email-hch@lst.de>

On Mon, Aug 29, 2016@12:53:30PM +0200, Christoph Hellwig wrote:
> +static int blk_mq_create_mq_map(struct blk_mq_tag_set *set,
> +		const struct cpumask *affinity_mask)
> +{
> +	int queue = -1, cpu = 0;
> +
> +	set->mq_map = kzalloc_node(sizeof(*set->mq_map) * nr_cpu_ids,
> +			GFP_KERNEL, set->numa_node);
> +	if (!set->mq_map)
> +		return -ENOMEM;
> +
> +	if (!affinity_mask)
> +		return 0;	/* map all cpus to queue 0 */
> +
> +	/* If cpus are offline, map them to first hctx */
> +	for_each_online_cpu(cpu) {
> +		if (cpumask_test_cpu(cpu, affinity_mask))
> +			queue++;
> +		if (queue >= 0)
> +			set->mq_map[cpu] = queue;
> +	}

This can't be right. We have a single affinity mask for the entire
set, but what I think we want is an one affinity mask for each
nr_io_queues. The irq_create_affinity_mask should then create an array
of cpumasks based on nr_vecs..

  reply	other threads:[~2016-08-31 16:38 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-29 10:53 blk-mq: allow passing in an external queue mapping V2 Christoph Hellwig
2016-08-29 10:53 ` Christoph Hellwig
2016-08-29 10:53 ` [PATCH 1/7] blk-mq: don't redistribute hardware queues on a CPU hotplug event Christoph Hellwig
2016-08-29 10:53   ` Christoph Hellwig
2016-08-29 10:53 ` [PATCH 2/7] blk-mq: only allocate a single mq_map per tag_set Christoph Hellwig
2016-08-29 10:53   ` Christoph Hellwig
2016-08-29 10:53 ` [PATCH 3/7] blk-mq: remove ->map_queue Christoph Hellwig
2016-08-29 10:53   ` Christoph Hellwig
2016-08-29 10:53 ` [PATCH 4/7] blk-mq: allow the driver to pass in an affinity mask Christoph Hellwig
2016-08-29 10:53   ` Christoph Hellwig
2016-08-31 16:38   ` Keith Busch [this message]
2016-08-31 16:38     ` Keith Busch
2016-09-01  8:46     ` Christoph Hellwig
2016-09-01  8:46       ` Christoph Hellwig
2016-09-01 14:24       ` Keith Busch
2016-09-01 14:24         ` Keith Busch
2016-09-01 23:30         ` Keith Busch
2016-09-01 23:30           ` Keith Busch
2016-09-05 19:48         ` Christoph Hellwig
2016-09-05 19:48           ` Christoph Hellwig
2016-09-06 14:39           ` Keith Busch
2016-09-06 14:39             ` Keith Busch
2016-09-06 16:50             ` Christoph Hellwig
2016-09-06 16:50               ` Christoph Hellwig
2016-09-06 17:30               ` Keith Busch
2016-09-06 17:30                 ` Keith Busch
2016-09-07 15:38               ` Thomas Gleixner
2016-09-07 15:38                 ` Thomas Gleixner
2016-08-29 10:53 ` [PATCH 5/7] nvme: switch to use pci_alloc_irq_vectors Christoph Hellwig
2016-08-29 10:53   ` Christoph Hellwig
2016-08-29 10:53 ` [PATCH 6/7] nvme: remove the post_scan callout Christoph Hellwig
2016-08-29 10:53   ` Christoph Hellwig
2016-08-29 10:53 ` [PATCH 7/7] blk-mq: get rid of the cpumask in struct blk_mq_tags Christoph Hellwig
2016-08-29 10:53   ` Christoph Hellwig
2016-08-30 23:28 ` blk-mq: allow passing in an external queue mapping V2 Keith Busch
2016-08-30 23:28   ` Keith Busch
2016-09-01  8:45   ` Christoph Hellwig
2016-09-01  8:45     ` Christoph Hellwig

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