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

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Date:	Tue, 28 Sep 2010 14:45:24 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
CC:	Jean Pihet <jean.pihet@...oldbits.com>,
	Thomas Renninger <trenn@...e.de>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Len Brown <len.brown@...el.com>, arjan@...radead.org,
	Kevin Hilman <khilman@...prootsystems.com>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	linux-omap@...r.kernel.org, linux-perf-users@...r.kernel.org,
	linux-trace-users@...r.kernel.org
Subject: Re: [PATCH] tracing, perf: add more power related events

  On 9/28/2010 2:22 PM, Rafael J. Wysocki wrote:
> On Tuesday, September 28, 2010, Jean Pihet wrote:
>> Hi,
> Hi,
>
>> Here is what I am proposing, in reply to all your comments:
>>
>> 1) rename the events to match Thomas's proposal:
>>     power:power_cpu_cstate
>>     power:power_cpu_pstate
>>     power:power_cpu_sstate
> If that sstate thing is going to mean "suspend", then please drop it.
> "Suspend" is not a state, let alone a CPU state.  It is a procedure by which
> the (entire) system is put into a sleep state (that is not confined to CPUs).

there are also non-suspend S states, like S0i1 and S0i3 (supported in 
the current Intel "Moorestown" platform)

so it's slightly more complex than "just" suspend :)

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