From: Frederic Weisbecker <fweisbec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Christoph Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
Cc: "Paul E. McKenney"
<paulmck-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
Chris Metcalf <cmetcalf-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
Gilad Ben Yossef <giladb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>,
Steven Rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>,
Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Rik van Riel <riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
Viresh Kumar
<viresh.kumar-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>,
Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>,
Daniel Lezcano
<daniel.lezcano-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: clocksource_watchdog causing scheduling of timers every second (was [v13] support "task_isolation" mode)
Date: Fri, 12 Aug 2016 16:26:13 +0200 [thread overview]
Message-ID: <20160812142611.GC5087@lerouge> (raw)
In-Reply-To: <alpine.DEB.2.20.1608120922450.20310-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
On Fri, Aug 12, 2016 at 09:23:13AM -0500, Christoph Lameter wrote:
> On Thu, 11 Aug 2016, Paul E. McKenney wrote:
>
> > Heh! The only really good idea is for clocks to be reliably in sync.
> >
> > But if they go out of sync, what do you want to do instead?
>
> For a NOHZ task? Write a message to the syslog and reenable tick.
Indeed, a strong clocksource is a requirement for a full tickless machine.
next prev parent reply other threads:[~2016-08-12 14:26 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-14 20:48 [PATCH v13 00/12] support "task_isolation" mode Chris Metcalf
2016-07-14 20:48 ` [PATCH v13 04/12] task_isolation: add initial support Chris Metcalf
2016-07-14 20:48 ` [PATCH v13 12/12] task_isolation: add user-settable notification signal Chris Metcalf
[not found] ` <1468529299-27929-1-git-send-email-cmetcalf-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-07-14 21:03 ` [PATCH v13 00/12] support "task_isolation" mode Andy Lutomirski
[not found] ` <CALCETrVddfd7ZDGpYs4CdkAMEmQCb6a-_5Um9bb4FO+XwWzOAA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-07-14 21:22 ` Chris Metcalf
2016-07-18 22:11 ` Andy Lutomirski
2016-07-18 22:50 ` Chris Metcalf
2016-07-18 0:42 ` Christoph Lameter
2016-07-21 2:04 ` Christoph Lameter
[not found] ` <alpine.DEB.2.20.1607202059180.25838-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2016-07-21 14:06 ` Chris Metcalf
2016-07-22 2:20 ` Christoph Lameter
2016-07-22 12:50 ` Chris Metcalf
2016-07-25 16:35 ` Christoph Lameter
[not found] ` <alpine.DEB.2.20.1607251133450.25354-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2016-07-27 13:55 ` clocksource_watchdog causing scheduling of timers every second (was [v13] support "task_isolation" mode) Christoph Lameter
2016-07-27 14:12 ` Chris Metcalf
[not found] ` <f8d72e47-7e84-cbd0-869f-69bf452a8bfb-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-07-27 15:23 ` Christoph Lameter
[not found] ` <alpine.DEB.2.20.1607271022130.25729-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2016-07-27 15:31 ` Christoph Lameter
2016-07-27 17:06 ` Chris Metcalf
2016-07-27 18:56 ` Christoph Lameter
2016-07-27 19:49 ` Chris Metcalf
2016-07-27 19:53 ` Christoph Lameter
2016-07-27 19:58 ` Chris Metcalf
[not found] ` <2fefa17d-37c6-9669-724e-9ee0d841e7b2-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2016-07-29 18:31 ` Francis Giraldeau
[not found] ` <CAC6yHM4LON5ASooVa_eUaDYsN1W0HYTMX76yHDxf8Mff0mKqiA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-07-29 21:04 ` Chris Metcalf
2016-08-10 22:16 ` Frederic Weisbecker
2016-08-10 22:26 ` Chris Metcalf
2016-08-11 8:40 ` Peter Zijlstra
2016-08-11 11:58 ` Frederic Weisbecker
2016-08-15 15:03 ` Chris Metcalf
2016-08-11 16:00 ` Paul E. McKenney
2016-08-11 23:02 ` Christoph Lameter
2016-08-11 23:47 ` Paul E. McKenney
2016-08-12 14:23 ` Christoph Lameter
[not found] ` <alpine.DEB.2.20.1608120922450.20310-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2016-08-12 14:26 ` Frederic Weisbecker [this message]
2016-08-12 16:19 ` Paul E. McKenney
[not found] ` <20160812161919.GV3482-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
2016-08-13 15:39 ` Frederic Weisbecker
2016-08-11 8:27 ` [PATCH v13 00/12] support "task_isolation" mode Peter Zijlstra
2016-07-27 14:01 ` Christoph Lameter
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