linux-kernel - Re: [PATCH] blk-mq: run hw queue asynchronously in blk_mq_start_hw

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Message-ID: <CACVXFVMWDBEhRhKQ1V2O9sWbAdQNb_RM0Nz_BA7Cn7P_OrvndQ@mail.gmail.com>
Date:	Wed, 25 Jun 2014 10:42:08 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Jens Axboe <axboe@...nel.dk>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc:	Ming Lei <tom.leiming@...il.com>
Subject: Re: [PATCH] blk-mq: run hw queue asynchronously in blk_mq_start_hw_queues

On Tue, Jun 24, 2014 at 10:53 PM, Ming Lei <tom.leiming@...il.com> wrote:
> From API view, it isn't good to run all hw queues synchronously
> in one context, since it isn't correct for multi hw queue case.
>
> So this patch adds 'async' parameter to blk_mq_start_hw_queue(),
> and make blk_mq_start_hw_queues() to run hw queues asynchronously
> at default.

BTW, without the change, it is easy to trigger the WARN_ON() in
__blk_mq_run_hw_queue().

Thanks,
-- 
Ming Lei
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