[PATCH] cpuidle: Measure idle state durations with monotonic clock

Len Brown lenb at kernel.org
Tue Nov 27 17:14:31 EST 2012

On 11/15/2012 04:04 AM, Preeti Murthy wrote:
> Hi all,
> The code looks correct and inviting to me as it has led to good cleanups.
> I dont think passing 0 as the argument to the function
> sched_clock_idle_wakeup_event()
> should lead to problems,as it does not do anything useful with the
> passed arguments.
> My only curiosity is what was the purpose of passing idle residency time to
> sched_clock_idle_wakeup_event() when this data could always be retrieved from
> dev->last_residency for each cpu,which gets almost immediately updated.

sched_clock_idle_wakeup_event() is part of the scheduler.
The scheduler doesn't know what a cpuidle_device is, and
probably should not grow such a dependency.

-Len Brown, Intel Open Source Technology Center

> But this does not seem to come in way of this patch for now.Anyway I
> have added Peter to
> the list so that he can opine about this issue if possible and needed.
> Reviewed-by: Preeti U Murthy <preeti at linux.vnet.ibm.com>
> Regards
> Preeti U Murthy

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