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

Don Zickus
2015-04-02T16:08:39Z

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. :-)

Cheers,
Don