On Fri 2014-05-09 13:26:47, Rafael J. Wysocki wrote:
> On Friday, May 09, 2014 09:38:35 AM Pavel Machek wrote:
> > On Mon 2014-05-05 00:51:54, Rafael J. Wysocki wrote:
> > > From: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
> > >
> > > If freeze_enter() is called, we want to bypass the current cpuidle
> > > governor and always use the deepest available (that is, not disabled)
> > > C-state, because we want to save as much energy as reasonably possible
> > > then and runtime latency constraints don't matter at that point, since
> > > the system is in a sleep state anyway.
> >
> > Would there be way to pass the parameter "go to deepest" instead of adding
> > global state for this?
>
> I'm not sure what you mean? A parameter of what in particular? And where
> to pass it?
Currently the code is:
static void freeze_enter(void)
{
+ cpuidle_use_deepest_state(true);
cpuidle_resume();
wait_event(suspend_freeze_wait_head, suspend_freeze_wake);
cpuidle_pause();
+ cpuidle_use_deepest_state(false);
}
. I believe it would be better if you did
cpuidle_resume(GOTO_DEEPEST_C_STATE)
instead of having global state.
Thanks,
Pavel
--
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