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Groups > linux.kernel > #1451486

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

From Christoph Lameter <cl@linux.com>
Newsgroups linux.kernel
Subject Re: clocksource_watchdog causing scheduling of timers every second (was [v13] support "task_isolation" mode)
Date 2016-07-27 22:00 +0200
Message-ID <rZD9L-3NN-5@gated-at.bofh.it> (permalink)
References (8 earlier) <rZyWu-19P-21@gated-at.bofh.it> <rZz6a-1cX-7@gated-at.bofh.it> <rZCdH-3d7-13@gated-at.bofh.it> <rZCdH-3d7-11@gated-at.bofh.it> <rZD9L-3NN-7@gated-at.bofh.it>
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On Wed, 27 Jul 2016, Chris Metcalf wrote:

> Looks good.  Did you omit the equivalent fix in clocksource_start_watchdog()
> on purpose?  For now I just took your change, but tweaked it to add the
> equivalent diff with cpumask_first_and() there.

Can the watchdog be started on an isolated cpu at all? I would expect that
the code would start a watchdog only on a housekeeping cpu.

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Thread

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

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