linux-kernel - Re: [PATCH] cpuidle: Measure idle state durations with monotonic clock

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Message-ID: <CAM4v1pPhaP=pVnFMXUU_nmrOxhY5yPNtbBdQsT5MH37MndK6LQ@mail.gmail.com>
Date:	Thu, 15 Nov 2012 14:34:41 +0530
From:	Preeti Murthy <preeti.lkml@...il.com>
To:	Julius Werner <jwerner@...omium.org>
Cc:	linux-kernel@...r.kernel.org, Len Brown <lenb@...nel.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Kevin Hilman <khilman@...com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	linux-acpi@...r.kernel.org, linux-pm@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>,
	Trinabh Gupta <g.trinabh@...il.com>,
	Sameer Nanda <snanda@...omium.org>,
	Lists Linaro-dev <linaro-dev@...ts.linaro.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] cpuidle: Measure idle state durations with monotonic clock

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.

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@...ux.vnet.ibm.com>

Regards
Preeti U Murthy
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