linux-kernel - Re: [RFC][PATCH 09/11] perf_counter: revamp syscall input ABI

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Date:	Wed, 18 Mar 2009 09:55:47 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	mingo@...e.hu, rostedt@...dmis.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH 09/11] perf_counter: revamp syscall input ABI

On Wed, 2009-03-18 at 15:31 +1100, Paul Mackerras wrote:
> Peter Zijlstra writes:
> 
> > The hardware/software classification in hw_event->type became a little strained
> > due to the addition of tracepoint tracing.
> > 
> > Instead split up the field and provide a type field to explicitly specify the
> > counter type, while using the event_id field to specify which event to use.
> 
> It would be nice if you didn't reuse the name 'type' but instead
> called the field something different ('class', perhaps?) to force a
> compile error on code that needs to be updated.  For example, you
> missed a spot in arch/powerpc/kernel/perf_counter.c and you need to
> add on the patch below.  (Thanks for updating powerpc BTW.)

Yeah, thought of that after I did the patch... :-)

Thanks.

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