Re: [PATCH] cpuidle: Invert CPUIDLE_FLAG_TIME_VALID logic

[Daniel Lezcano]

On 11/13/2014 03:56 PM, Lorenzo Pieralisi wrote:
> On Wed, Nov 12, 2014 at 03:03:50PM +0000, Daniel Lezcano wrote:
> > The only place where the time is invalid is when the ACPI_CSTATE_FFH entry
> > method is not set. Otherwise for all the drivers, the time can be correctly
> > measured.
> >
> > Instead of duplicating the CPUIDLE_FLAG_TIME_VALID flag in all the drivers
> > for all the states, just invert the logic by replacing it by the flag
> > CPUIDLE_FLAG_TIME_INVALID, hence we can set this flag only for the acpi idle
> > driver, remove the former flag from all the drivers and invert the logic with
> > this flag in the different governor.
> >
> > Signed-off-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx>
>
> Are we sure that ACPI C1 invalid residency time is *still* an issue after
> we moved the residency accounting to the idle core ?

(Cc'ed linux-acpi@)

Hi x86 guys,

any comment on that ?

Thanks in advance

 -- Daniel

> I have a feeling you can remove this flag entirely, but I will let x86
> guys speak for themselves.

[ ... ]

> > diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
> > index 17f9ec5..380b4b4 100644
> > --- a/drivers/acpi/processor_idle.c
> > +++ b/drivers/acpi/processor_idle.c
> > @@ -985,8 +985,8 @@ static int acpi_processor_setup_cpuidle_states(struct acpi_processor *pr)
> >                  state->flags = 0;
> >                  switch (cx->type) {
> >                          case ACPI_STATE_C1:
> > -                       if (cx->entry_method == ACPI_CSTATE_FFH)
> > -                               state->flags |= CPUIDLE_FLAG_TIME_VALID;
> > +                       if (cx->entry_method != ACPI_CSTATE_FFH)
> > +                               state->flags |= CPUIDLE_FLAG_TIME_INVALID;

[ ... ]


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