linux-kernel - Re: comments on Performance Counters for Linux (PCL)

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Date:	Thu, 28 May 2009 18:47:36 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	eranian@...il.com
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Robert Richter <robert.richter@....com>,
	Paul Mackerras <paulus@...ba.org>,
	Andi Kleen <andi@...stfloor.org>,
	Maynard Johnson <mpjohn@...ibm.com>,
	Carl Love <cel@...ibm.com>,
	Corey J Ashford <cjashfor@...ibm.com>,
	Philip Mucci <mucci@...s.utk.edu>,
	Dan Terpstra <terpstra@...s.utk.edu>,
	perfmon2-devel <perfmon2-devel@...ts.sourceforge.net>
Subject: Re: comments on Performance Counters for Linux (PCL)

On Thu, 2009-05-28 at 18:25 +0200, Peter Zijlstra wrote:
> >      - uint64_t exclude_*
> > 
> >        It seems those fields were added to support the generic HW events. But
> >        I think they are confusing and their semantic is not quite clear.
> > 
> >        Furthermore, aren't they irrelevant for the SW events?
> 
> They are.

It seems I can't read. They are _not_ irrelevant, sw events do honour
them. We can for instance distinguish between the kernel causing a
pagefualt and userspace doing so.

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