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

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Message-ID: <4C9A21AD.1000800@linux.intel.com>
Date:	Wed, 22 Sep 2010 08:33:01 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Jean Pihet <jean.pihet@...oldbits.com>
CC:	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, discuss@...swatts.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 9/22/2010 8:31 AM, Jean Pihet wrote:
> Hi,
>
> Here is a patch that redefines the power events API. The advantages
> are: easier maintainance of the kernel and the
> user space tools, a cleaner and more generic interface, more
> parameters for fine tracing and even documentation!
>
> Thomas, this patch has your patch above merged in ('power-trace: Use
> power_switch_state instead of power_start and power_end'). The revised
> ACPI patch is coming asap.
>
> The trace points for x86 and OMAP are also udated accordingly.
>
> The pytimechart tool needs an update for the new API. This can be done
> as soon as the kernel code gets merged in.

unfortunately this code is changing a userspace ABI... we really 
shouldn't do that if we can avoid it,
and here we can avoid it.

applications ARE using this stuff!
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