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

From	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Newsgroups	linux.kernel
Subject	Re: clocksource_watchdog causing scheduling of timers every second (was [v13] support "task_isolation" mode)
Date	2016-08-12 01:50 +0200
Message-ID	<s57Tz-2lF-17@gated-at.bofh.it> (permalink)
References	(5 earlier) <rZxxo-6F-9@gated-at.bofh.it> <s4K0W-2GI-29@gated-at.bofh.it> <s4TQC-1tP-23@gated-at.bofh.it> <s56Ea-1t7-11@gated-at.bofh.it> <s57gS-25e-25@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, Aug 11, 2016 at 06:02:34PM -0500, Christoph Lameter wrote:
> On Thu, 11 Aug 2016, Paul E. McKenney wrote:
> 
> > > With modern Intel we could run it on one CPU per package I think, but at
> > > the same time, too much in NOHZ_FULL assumes the TSC is indeed sane so
> > > it doesn't make sense to me to keep the watchdog running, when it
> > > triggers it would also have to kill all NOHZ_FULL stuff, which would
> > > probably bring the entire machine down..
> >
> > Well, you -could- force a very low priority CPU-bound task to run on
> > all nohz_full CPUs.  Not necessarily a good idea, but a relatively
> > non-intrusive response to that particular error condition.
> 
> Given that we want the cpu only to run the user task I would think that is
> not a good idea.

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?

							Thanx, Paul

Thread

Re: clocksource_watchdog causing scheduling of timers every second  (was [v13] support "task_isolation" mode) Frederic Weisbecker <fweisbec@gmail.com> - 2016-08-11 00:20 +0200
  Re: clocksource_watchdog causing scheduling of timers every second  (was [v13] support "task_isolation" mode) Peter Zijlstra <peterz@infradead.org> - 2016-08-11 10:50 +0200
    Re: clocksource_watchdog causing scheduling of timers every second  (was [v13] support "task_isolation" mode) Frederic Weisbecker <fweisbec@gmail.com> - 2016-08-11 14:10 +0200
    Re: clocksource_watchdog causing scheduling of timers every second  (was [v13] support "task_isolation" mode) "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-12 00:30 +0200
      Re: clocksource_watchdog causing scheduling of timers every second  (was [v13] support "task_isolation" mode) Christoph Lameter <cl@linux.com> - 2016-08-12 01:10 +0200
        Re: clocksource_watchdog causing scheduling of timers every second  (was [v13] support "task_isolation" mode) "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-12 01:50 +0200
          Re: clocksource_watchdog causing scheduling of timers every second  (was [v13] support "task_isolation" mode) Christoph Lameter <cl@linux.com> - 2016-08-12 16:30 +0200
            Re: clocksource_watchdog causing scheduling of timers every second  (was [v13] support "task_isolation" mode) Frederic Weisbecker <fweisbec@gmail.com> - 2016-08-12 16:30 +0200
              Re: clocksource_watchdog causing scheduling of timers every second  (was [v13] support "task_isolation" mode) "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-08-12 18:20 +0200
                Re: clocksource_watchdog causing scheduling of timers every second  (was [v13] support "task_isolation" mode) Frederic Weisbecker <fweisbec@gmail.com> - 2016-08-13 17:40 +0200

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