linux-kernel - Re: [PATCH v4 10/10] blk-mq: support per-distpatch

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Message-ID: <CACVXFVOM_K_9ogwsBJ+2wTK-D-wbVVkOK3=60tgoTKsnTS+33g@mail.gmail.com>
Date:	Wed, 24 Sep 2014 23:21:13 +0800
From:	Ming Lei <ming.lei@...onical.com>
To:	Christoph Hellwig <hch@....de>
Cc:	Jens Axboe <axboe@...nel.dk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 10/10] blk-mq: support per-distpatch_queue flush machinery

On Wed, Sep 24, 2014 at 6:26 PM, Christoph Hellwig <hch@....de> wrote:
>> +struct blk_flush_queue *blk_alloc_flush_queue(struct request_queue *q,
>> +             struct blk_mq_hw_ctx *hctx, int cmd_size)
>
> I still think this should pass in the numa node instead of the hctx, and
> allow node-local allocation for the old code as well.

We can do that, but have to pass NUMA_NO_NODE for old code
since blk_init_allocated_queue() doesn't provide node information
yet.

> As mentioned earlier
> initializing mq_flush_lock for the !mq case is harmless.

q->mq_ops is another friend for the purpose, :-)

>
> We also should document it where cleary somewhere that for devices that
> have flushes enabled ->init_request can be called for more requests than
> the queue depth, as drivers might allocate some sort of pool for them.

That does make sense.

Thanks,
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