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

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Date:	Mon, 10 Jan 2011 12:06:13 -0700 (MST)
From:	Paul Walmsley <paul@...an.com>
To:	Jean Pihet <jean.pihet@...oldbits.com>
cc:	mingo@...e.hu, trenn@...e.de,
	Kevin Hilman <khilman@...prootsystems.com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...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

Hello Jean,

On Wed, 5 Jan 2011, Jean Pihet wrote:

> On Tue, Jan 4, 2011 at 7:48 PM, Paul Walmsley <paul@...an.com> wrote:
>
> > If the latter, then it might make sense to put these
> > trace points into the functions that actually change the hardware
> > registers, e.g., omap2_dflt_clk_{enable,disable}(), etc., since a
> > clk_enable() on a leaf clock may result in many internal system clocks
> > being enabled up the clock tree.
> I agree with you it is better to track the actual clock changes instead.
> I propose to move the tracepoints to omap2_clk_{enable...} which
> enables all the clocks irrespectively of the installed handler.

Yes, that is a better place.

> Note about the clock handlers: omap2_dflt_clk_enable happens to be the
> handler for all controllable clocks but could that change in the
> future?

Yes, it certainly could.


- Paul
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