Re: [PATCH v9 1/3] smpboot: allow excluding cpus from the smpboot threads

Andrew Morton
2015-04-29T22:26:17Z

On Fri, 17 Apr 2015 14:37:16 -0400 Chris Metcalf <cmetcalf@ezchip.com> wrote:

> This change allows some cores to be excluded from running the
> smp_hotplug_thread tasks. The following commit to update
> kernel/watchdog.c to use this functionality is the motivating
> example, and more information on the motivation is provided there.
>
> A new smp_hotplug_thread field is introduced, "cpumask", which
> is cpumask field managed by the smpboot subsystem that indicates whether
> or not the given smp_hotplug_thread should run on that core; the
> cpumask is checked when deciding whether to unpark the thread.
>
> To limit the cpumask to less than cpu_possible, you must call
> smpboot_update_cpumask_percpu_thread() after registering.

Has Thomas commented on any version of this? t'would be nice.