Re: clocksource_watchdog causing scheduling of timers every second (was [v13] support "task_isolation" mode)

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To: Christoph Lameter <cl@xxxxxxxxx>
Subject: Re: clocksource_watchdog causing scheduling of timers every second (was [v13] support "task_isolation" mode)
From: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Date: Fri, 12 Aug 2016 16:26:13 +0200
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Chris Metcalf <cmetcalf@xxxxxxxxxxxx>, Gilad Ben Yossef <giladb@xxxxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Rik van Riel <riel@xxxxxxxxxx>, Tejun Heo <tj@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Viresh Kumar <viresh.kumar@xxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Will Deacon <will.deacon@xxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxxxxxx>, Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, linux-api@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <alpine.DEB.2.20.1608120922450.20310@east.gentwo.org>
User-agent: Mutt/1.5.24 (2015-08-30)

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.
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References:
- Re: [PATCH v13 00/12] support "task_isolation" mode
  - From: Christoph Lameter
- Re: [PATCH v13 00/12] support "task_isolation" mode
  - From: Chris Metcalf
- Re: [PATCH v13 00/12] support "task_isolation" mode
  - From: Christoph Lameter
- clocksource_watchdog causing scheduling of timers every second (was [v13] support "task_isolation" mode)
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- Re: clocksource_watchdog causing scheduling of timers every second (was [v13] support "task_isolation" mode)
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- Re: clocksource_watchdog causing scheduling of timers every second (was [v13] support "task_isolation" mode)
  - From: Peter Zijlstra
- Re: clocksource_watchdog causing scheduling of timers every second (was [v13] support "task_isolation" mode)
  - From: Paul E. McKenney
- Re: clocksource_watchdog causing scheduling of timers every second (was [v13] support "task_isolation" mode)
  - From: Christoph Lameter
- Re: clocksource_watchdog causing scheduling of timers every second (was [v13] support "task_isolation" mode)
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