Re: [PATCH] watchdog: nohz: don't run watchdog on nohz_full cores

From: Don Zickus
Date: Thu Apr 02 2015 - 12:08:42 EST

On Thu, Apr 02, 2015 at 11:42:43AM -0400, Chris Metcalf wrote:
> >
> >>Then perhaps as a debug aid, expose a /proc/sys/kernel/watchdog_cpumask for
> >>folks to modify in case they want to enable the watchdog on the nohz cpus.
> >That sounds like a good idea.
> OK, I will respin v2 of the patch as follows:
> - Provide a watchdog_cpumask as suggested by Don.
> - On a non-NO_HZ_FULL build, it defaults to cpu_possible as normal
> - On a NO_HZ_FULL build, it defaults to the housekeeping cpus
> - If the mask is modified, we disable and then re-enable the watchdog,
> so that the watchdog init code can exit() the appropriate threads as
> they start up

Sounds good. :-)

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