linux-kernel - Re: [PATCH 2/3] perf: add OMAP support for the new power events

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Date:	Tue, 04 Jan 2011 12:03:56 -0600
From:	Nishanth Menon <nm@...com>
To:	jean.pihet@...oldbits.com
CC:	mingo@...e.hu, linux-kernel@...r.kernel.org, trenn@...e.de,
	linux-omap@...r.kernel.org,
	Arjan van de Ven <arjan@...ux.intel.com>,
	linux-perf-users@...r.kernel.org, rjw@...k.pl,
	Jean Pihet <j-pihet@...com>
Subject: Re: [PATCH 2/3] perf: add OMAP support for the new power events

jean.pihet@...oldbits.com had written, on 01/04/2011 04:17 AM, the 
following:
[..]
> diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
> index 0ec8a04..0ee0b0e 100644
> --- a/arch/arm/mach-omap2/pm34xx.c
> +++ b/arch/arm/mach-omap2/pm34xx.c
> @@ -29,6 +29,7 @@
>  #include <linux/delay.h>
>  #include <linux/slab.h>
>  #include <linux/console.h>
> +#include <trace/events/power.h>
>  
>  #include <plat/sram.h>
>  #include <plat/clockdomain.h>
> @@ -506,8 +507,14 @@ static void omap3_pm_idle(void)
>  	if (omap_irq_pending() || need_resched())
>  		goto out;
>  
> +	trace_power_start(POWER_CSTATE, 1, smp_processor_id());
> +	trace_cpu_idle(1, smp_processor_id());
> +
>  	omap_sram_idle();
>  
> +	trace_power_end(smp_processor_id());
> +	trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());

Dumb question: it just tells me which C state was attempted - not if 
actually succeeded in hitting it rt? Does'nt this give us a false data?

[..]
> diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c
> index fc62fb5..7cbb09b 100644
> --- a/arch/arm/plat-omap/clock.c
> +++ b/arch/arm/plat-omap/clock.c
(from an offline discussion on a related topic): Would it also be nice 
to hook on mach-omap2/clock.c points as well to hook on indirect changes?
[..]

-- 
Regards,
Nishanth Menon
--
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