linux-kernel - Re: NFS: 82ms wakeup latency 4.14-rc4

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Date:   Mon, 18 Dec 2017 17:48:06 +0100
From:   Mike Galbraith <efault@....de>
To:     "J. Bruce Fields" <bfields@...ldses.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Jeff Layton <jlayton@...nel.org>, linux-nfs@...r.kernel.org
Subject: Re: NFS: 82ms wakeup latency 4.14-rc4

On Mon, 2017-12-18 at 11:35 -0500, J. Bruce Fields wrote:
> 
> This probably just shows I don't understand the issues, but: isn't this
> the job of preemption?

If this were a PREEMPT kernel, yes, we'd check need_resched() on lock
release etc, but it's a PREEMPT_VOLUNTARY kernel.

	-Mike