[PATCH -- RFC] Add support to OProfile for profiling Cell BE SPUs

[Maynard Johnson]

Any comments on the attached patch would be appreciated.  Thank you.

-Maynard

-------------------------------
Maynard Johnson wrote:
> The attached patch extends OProfile's Cell support (committed into
> 2.6.20-rc1), adding the capability to do time-based profiling of the SPUs.
> 
> This is a preliminary patch we're posting for comments.  Development is
> not 100% complete yet, but very close.  This patch is dependent on two
> outstanding patches that have not yet been committed to mainline:  1)
> the cleanup patch for the initial OProfile Cell PPU support (posted on
> Nov 27); and 2) the spu notifier patch (posted on Dec 1), which exports
> the [un]register functions in SPUFS.  It is also dependent on an
> internal patch, which will be submitted once the cleanup patch is
> committed.  So please don't try to apply this patch to a source tree yet.
> 
> The code is functional and passing all test scenarios, except one:  if
> an SPU task is already active before OProfile is started, the
> notification we receive for this already-active task happens in the
> wrong context, so we're unable to collect the information we need about
> the SPU binary being executed.  The spu notifer patch mentioned above
> was meant to solve this problem, but in fact, it does not (which is why
> that patch hasn't been committed yet).  We're currently investigating
> other options.
> 
> All comments are welcome.
> 
> NOTE:  The availability of the developers of this patch is limited
> between now and Jan 2, 2007, so replies to comments may be delayed until
> then.
> 
> Thanks.
> Maynard Johnson
> IBM LTC Toolchain
> 
> 
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> Linuxppc-dev at ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev

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