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Re: [PATCH v13 00/12] support "task_isolation" mode

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On Fri, 22 Jul 2016, Chris Metcalf wrote:

> > It already as a stable clocksource. Sorry but that was one of the criteria
> > for the server when we ordered them. Could this be clock adjustments?
>
> We probably need to get clock folks to jump in on this thread!

Guess so. I will have a look at this when I get some time again.

> Maybe it's disabling some built-in unstable clock just as part of
> falling back to using the better, stable clock that you also have?
> So maybe there's a way of just disabling that clocksource from the
> get-go instead of having it be marked unstable later.

This is a standard Dell server. No clocksources are marked as unstable as
far as I can tell.

> If you run the test again after this storm of unstable marking, does
> it all happen again?  Or is it a persistent state in the kernel?

This happens anytime we try to run with prctl().

I hope to get some more detail once I get some time to look at this. But
this is likely an x86 specific problem.

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[PATCH v13 00/12] support "task_isolation" mode Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 22:50 +0200
  [PATCH v13 12/12] task_isolation: add user-settable notification signal Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 22:50 +0200
  [PATCH v13 06/12] arch/x86: enable task isolation functionality Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 22:50 +0200
  [PATCH v13 03/12] lru_add_drain_all: factor out lru_add_drain_needed Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 22:50 +0200
  [PATCH v13 04/12] task_isolation: add initial support Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 22:50 +0200
  [PATCH v13 09/12] arch/tile: enable task isolation functionality Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 23:00 +0200
  [PATCH v13 01/12] vmstat: add quiet_vmstat_sync function Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 23:00 +0200
  [PATCH v13 05/12] task_isolation: track asynchronous interrupts Chris Metcalf <cmetcalf@mellanox.com> - 2016-07-14 23:00 +0200
  Re: [PATCH v13 00/12] support "task_isolation" mode Andy Lutomirski <luto@amacapital.net> - 2016-07-14 23:10 +0200
    Re: [PATCH v13 00/12] support "task_isolation" mode Christoph Lameter <cl@linux.com> - 2016-07-18 02:50 +0200
    Re: [PATCH v13 00/12] support "task_isolation" mode Andy Lutomirski <luto@amacapital.net> - 2016-07-19 00:20 +0200
  Re: [PATCH v13 00/12] support "task_isolation" mode Christoph Lameter <cl@linux.com> - 2016-07-21 04:10 +0200
    Re: [PATCH v13 00/12] support "task_isolation" mode Christoph Lameter <cl@linux.com> - 2016-07-22 04:30 +0200
      Re: [PATCH v13 00/12] support "task_isolation" mode Christoph Lameter <cl@linux.com> - 2016-07-25 18:40 +0200
        clocksource_watchdog causing scheduling of timers every second (was  [v13] support "task_isolation" mode) Christoph Lameter <cl@linux.com> - 2016-07-27 16:00 +0200
          Re: clocksource_watchdog causing scheduling of timers every second  (was [v13] support "task_isolation" mode) Christoph Lameter <cl@linux.com> - 2016-07-27 17:30 +0200
            Re: clocksource_watchdog causing scheduling of timers every second  (was [v13] support "task_isolation" mode) Christoph Lameter <cl@linux.com> - 2016-07-27 17:40 +0200
              Re: clocksource_watchdog causing scheduling of timers every second  (was [v13] support "task_isolation" mode) Christoph Lameter <cl@linux.com> - 2016-07-27 21:00 +0200
                Re: clocksource_watchdog causing scheduling of timers every second  (was [v13] support "task_isolation" mode) Christoph Lameter <cl@linux.com> - 2016-07-27 22:00 +0200
                Re: clocksource_watchdog causing scheduling of timers every second  (was [v13] support "task_isolation" mode) Francis Giraldeau <francis.giraldeau@gmail.com> - 2016-07-29 20:40 +0200
  Re: [PATCH v13 00/12] support "task_isolation" mode Christoph Lameter <cl@linux.com> - 2016-07-27 16:10 +0200

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