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Subject: Re: comments on Performance Counters for Linux (PCL)
From: Peter Zijlstra <peterz@infradead.org>
To: eranian@gmail.com
Cc: LKML <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@linux-foundation.org>,
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Date: Thu, 28 May 2009 18:47:36 +0200
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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.