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Message-ID: <18791.10652.298501.863657@cargo.ozlabs.ibm.com>
Date: Fri, 9 Jan 2009 21:40:28 +1100
From: Paul Mackerras <paulus@samba.org>
To: linux-kernel@vger.kernel.org
CC: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>
Subject: [PATCH 0/9] Performance counters for POWER
Sender: linux-kernel-owner@vger.kernel.org
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The following series of patches extends Ingo and Thomas's performance
counter framework to add support for 64-bit POWER processors.
Currently I have the PPC970 family and POWER6 done.

The approach I have taken is to do the constraint checking and the
search through the space of alternative event codes as each group of
counters is added at the time a task is scheduled in.  That means we
are potentially doing the search several times in a row, with
interrupts disabled.  I think it will be OK since there are only a few
events that have alternatives (and not many of them), and the
constraint checking is fast since it is just simple integer
operations.  However, one of the things I plan to do is to instrument
that code to find out how long it takes in the worst case.  (If it
takes too long then I will need some major changes to the generic
code.)

This series is also available via git at:

git://git.kernel.org/pub/scm/linux/kernel/git/paulus/perfcounters.git

in the master branch.

Paul.
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