linux-kernel - Re: [Cbe-oss-dev] [RFC, PATCH 4/4] Add support to OProfile for profiling Cell BE SPUs -- update

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Message-Id: <200702030840.06270.arnd@arndb.de>
Date:	Sat, 3 Feb 2007 08:40:05 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	maynardj@...ibm.com
Cc:	cbe-oss-dev@...abs.org, linuxppc-dev@...abs.org,
	oprofile-list@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [Cbe-oss-dev] [RFC, PATCH 4/4] Add support to OProfile for profiling Cell BE SPUs -- update

On Friday 02 February 2007 17:47, Maynard Johnson wrote:
> 
> > We also want to be able to profile the context switch code itself, which
> > means that we also need one event buffer associated with the kernel to
> > collect events that for a zero context_id.
> The hardware design precludes tracing both SPU and PPU simultaneously.
> 
I mean the SPU-side part of the context switch code, which you can find
in arch/powerpc/platforms/cell/spufs/spu_{save,restore}*.

This code is the one that runs when context_id == 0 is passed to the
callback.

	Arnd <><
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