Re: [PATCH 5/6] intel_idle: Add ->enter_freeze callbacks

Li, Aubrey
2015-03-04T23:50:26Z

On 2015/2/13 0:24, Rafael J. Wysocki wrote:
> On Thursday, February 12, 2015 02:26:43 PM Peter Zijlstra wrote:
>>
>> Why bother with enter_freeze() for any but the deepest state (C6 in this
>> case)?
>
> User space may disable the deepest one (and any of them in general) via sysfs
> and there's no good reason to ignore its choice in this particular case while
> we're honoring it otherwise.
>
> So the logic is basically "find the deepest one which isn't disabled" and
> setting the pointers costs us nothing really.
>

If the user has chance to disable C6 via /sys, that means c6 works?
Shouldn't we ignore user space setting during freeze? Otherwise, we will
lost S0ix?

Thanks,
-Aubrey