On Wednesday, January 11, 2012 12:48:20 AM akpm@xxxxxxxxxxxxxxxxxxxx wrote:
> From: Shaohua Li <shaohua.li@xxxxxxxxx>
> Subject: intel_idle: disable auto_demotion for hotplugged CPUs
This one should not be necessary anymore with my intel_idle
patch series I have to rebase and resend (will do that after lunch).
It provides a per cpu intel_idle init function which is called
from processor.ko in physical cpu hotplug case.
>From what I can see this patch does not change anything/much, because:
- CPUs onlined at bootup are initialized correctly already
- Soft offlining/onlining shouldn't matter in auto_demotion_disable
case as it's a HW MSR write and the CPU should still be in the
same state after off- and onlined again.
- Physically hotplugged/added CPUs are not registered with cpuidle
at all (this is what my patch series fixes), because intel_idle
does not offer any per cpu init() entry function.
With this patch they might be set into auto_demotion_disable now,
but no idle driver gets active for them.
I'll pick up patch 1/3 and 3/3, base my patches on top and resend
everything, that should be easiest for everybody?
Thomas
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