Re: [PATCH] blk-mq: add trace block plug and unplug for multiple queues

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On Tue, Mar 26, 2019 at 09:19:25PM +0800, Yufen Yu wrote:
> For now, we just trace plug for single queue device or drivers
> provide .commit_rqs, and have not trace plug for multiple queues
> device. But, unplug events will be recorded when call
> blk_mq_flush_plug_list(). Then, trace events will be asymmetrical,
> just have unplug and without plug.
> 
> This patch add trace plug and unplug for multiple queues device in
> blk_mq_make_request(). After that, we can accurately trace plug and
> unplug for multiple queues.
> 
> Signed-off-by: Yufen Yu <yuyufen@xxxxxxxxxx>

Looks good,

Reviewed-by: Christoph Hellwig <hch@xxxxxx>



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