linux-kernel - Re: [PATCH] cpuidle: Always stop scheduler tick on adaptive-tick CPUs

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] [day] [month] [year] [list]

Message-ID: <20190718000841.GA28715@lenoir>
Date:   Thu, 18 Jul 2019 02:08:42 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PM <linux-pm@...r.kernel.org>,
        Thomas Lindroth <thomas.lindroth@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] cpuidle: Always stop scheduler tick on adaptive-tick CPUs

On Thu, Jul 18, 2019 at 12:27:09AM +0200, Rafael J. Wysocki wrote:
> On Wed, Jul 17, 2019 at 3:21 PM Frederic Weisbecker <frederic@...nel.org> wrote:
> >
> > On Wed, Jul 17, 2019 at 09:55:08AM +0200, Rafael J. Wysocki wrote:
> > Well I think we disagree on that assumption that if a nohz_full CPU is put
> > idle, it will remain there indefinitely. Nohz_full CPUs aren't really special
> > in this regard, they can sleep on an IO, wait for a short event just like
> > any other CPU.
> 
> Fair enough.
> 
> This means that the governor (or rather governors) will need to be
> modified to address the issue reported by Thomas.
> 
> Fortunately, I have a patch going in that direction too. :-)

Good to hear, please also Cc me on that one, thanks!