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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1513615686.7113.10.camel@gmx.de>
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