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From: Bart Van Assche <Bart.VanAssche@sandisk.com>
To: "snitzer@redhat.com" <snitzer@redhat.com>
Cc: "dm-devel@redhat.com" <dm-devel@redhat.com>
Subject: Re: [PATCH] dm-mpath: Requeue after a small delay if blk_get_request() fails
Date: Fri, 21 Apr 2017 20:34:35 +0000	[thread overview]
Message-ID: <1492806874.2550.30.camel@sandisk.com> (raw)
In-Reply-To: <dbf70983-7e32-0a65-589b-8cfb15c12792@sandisk.com>

On Fri, 2017-04-07 at 16:50 -0700, Bart Van Assche wrote:
> If blk_get_request() returns ENODEV then multipath_clone_and_map()
> causes a request to be requeued immediately. This can cause a
> kworker thread to spend 100% of the CPU time of a single core in
> __blk_mq_run_hw_queue() and also can cause device removal to
> never finish.
> 
> Avoid this by only requeuing after a delay if blk_get_request()
> fails. Additionally, reduce the requeue delay.

Hello Mike,

The v4.12 merge window will open soon. Have you already had the
time to review this patch?

Thanks,

Bart.

      reply	other threads:[~2017-04-21 20:34 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-07 23:50 [PATCH] dm-mpath: Requeue after a small delay if blk_get_request() fails Bart Van Assche
2017-04-21 20:34 ` Bart Van Assche [this message]

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