linux-kernel - Re: [Cbe-oss-dev] [RFC, PATCH] CELL Oprofile SPU profiling updated patch

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Message-ID: <20070208180119.GA24743@lisas.de>
Date:	Thu, 8 Feb 2007 19:01:19 +0100
From:	Adrian Reber <adrian@...as.de>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	cbe-oss-dev@...abs.org, linuxppc-dev@...abs.org,
	oprofile-list@...ts.sourceforge.net,
	LKML <linux-kernel@...r.kernel.org>,
	Milton Miller <miltonm@....com>, Carl Love <cel@...ibm.com>
Subject: Re: [Cbe-oss-dev] [RFC, PATCH] CELL Oprofile SPU profiling updated patch

On Thu, Feb 08, 2007 at 06:21:56PM +0100, Arnd Bergmann wrote:
[...]
> Moving the sample rate computation to user space sounds like the right
> idea, but why not have a more drastic version of it:
> 
> Right now, all products that support this feature run at the same clock
> rate (3.2 Ghz), with cpufreq, we can reduce this to 1.6 Ghz. If I understand
> this correctly, the value depends only on the frequency, so we could simply
> hardcode this in the kernel, and print out a warning message if we ever
> encounter a different frequency, right?

Just for the record... CAB is running with 2.8 GHz. At least all the boards
I have seen.

		Adrian
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