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Date: Fri, 14 Jul 2006 16:37:39 -0700
From: Mike Kravetz <kravetz@us.ibm.com>
To: Paul Mackerras <paulus@samba.org>
Subject: [PATCH 0/3] powerpc: Instrument Hypervisor Calls
Message-ID: <20060714233739.GA11487@monkey.ibm.com>
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Cc: Arnd Bergmann <arnd@arndb.de>, Bryan Rosenburg <rosnbrg@us.ibm.com>,
	linuxppc-dev@ozlabs.org, Nathan Lynch <ntl@pobox.com>,
	Christopher Yeoh <cyeoh@samba.org>
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Hi Paul,

Here is an updated version of the patch(es) to instrument hcalls.  All
issues from the previous versions have been addressed.  Although, I
haven't really discovered an elegant solution to the assembly routine
name juggling.

In addition, there has been some discussion of these patches on IRC.
Some remaining issues/questions are:
- Exactly how much overhead does the statistic gathering introduce?
- What would be the cost of disabling preemption for more accurate statistics?
- What would be the cost of disabling interrupts for more accurate statistics?
- Should we extend this statistic gathering to RTAS calls?

I would like to get this basic code integrated and then start to address
some of these questions.  The IBM performance group will help in
benchmarking to determine overhead.

Please note that all code is behind a config option (off by default) with
zero impact unless enabled.

-- 
Mike