[Cbe-oss-dev] [PATCH -- RFC] Add support OProfile for profiling Cell BE SPUs
maynardj at us.ibm.com
Sat Dec 16 06:24:51 EST 2006
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
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
IBM LTC Toolchain
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