linux-kernel - Re: [PATCH] tracing, perf: add more power related events

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Date:	Mon, 6 Sep 2010 14:00:05 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	Jean Pihet <jean.pihet@...oldbits.com>
Cc:	discuss@...swatts.org, linux-pm@...ts.linux-foundation.org,
	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Len Brown <len.brown@...el.com>, arjan@...radead.org,
	Kevin Hilman <khilman@...prootsystems.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tracing, perf: add more power related events

On Monday 06 September 2010 13:27:13 Jean Pihet wrote:
> On Mon, Sep 6, 2010 at 12:42 PM, Thomas Renninger <trenn@...e.de> wrote:
...
> In order to reach an efficient low power mode you
> need to ensure that all clocks in a clock domain are idled or cut off
> (automatically by the HW or with the intervention of SW drivers).
> 
> The HW complexity requires the tracing of all those clocks/power
> states, that is why new events are proposed.
Hm, but if the HW can switch clocks behind your back, how do you
realize that to throw a perf clock power event then?
Theoretically you need to poll to keep track of HW switching the
clocks?

    Thomas
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