linux-kernel - Re: [PATCH 3/3] blk-mq: prealloc tags when increase tagset nr_hw

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Date:   Tue, 22 Aug 2023 20:55:34 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     chengming.zhou@...ux.dev
Cc:     axboe@...nel.dk, hch@....de, bvanassche@....org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        zhouchengming@...edance.com
Subject: Re: [PATCH 3/3] blk-mq: prealloc tags when increase tagset
 nr_hw_queues

On Mon, Aug 21, 2023 at 05:56:02PM +0800, chengming.zhou@...ux.dev wrote:
> From: Chengming Zhou <zhouchengming@...edance.com>
> 
> Just like blk_mq_alloc_tag_set(), it's better to prepare all tags before
> using to map to queue ctxs in blk_mq_map_swqueue(), which now have to
> consider empty set->tags[].
> 
> The good point is that we can fallback easily if increasing nr_hw_queues
> fail, instead of just mapping to hctx[0] when fail in blk_mq_map_swqueue().
> 
> And the fallback path already has tags free & clean handling, so all
> is good.
> 
> Signed-off-by: Chengming Zhou <zhouchengming@...edance.com>

Reviewed-by: Ming Lei <ming.lei@...hat.com>

-- 
Ming