linux-kernel - Re: [PATCH 0/9] Performance counters for POWER

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Date:	Sun, 11 Jan 2009 02:44:29 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 0/9] Performance counters for POWER


* Paul Mackerras <paulus@...ba.org> wrote:

> 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.

Pulled into tip/perfcounters/core, thanks Paul!

	Ingo
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