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
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