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

[Chris Metcalf]

On 04/29/2015 06:26 PM, Andrew Morton wrote:
> On Fri, 17 Apr 2015 14:37:16 -0400 Chris Metcalf <cmetcalf@xxxxxxxxxx> 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.

He offered some specific feedback here:

  https://lkml.org/lkml/2015/4/8/684

that I reflected in the subsequent iteration of the patch series.

Thomas, any additional feedback would be appreciated.

--
Chris Metcalf, EZChip Semiconductor
http://www.ezchip.com

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/