linux-kernel - Re: [PATCH 1/2] perf: Add persistent events

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Message-ID: <20100523183353.GB1408@liondog.tnic>
Date:	Sun, 23 May 2010 20:33:53 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Lin Ming <ming.m.lin@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf: Add persistent events

From: Peter Zijlstra <peterz@...radead.org>
Date: Sun, May 23, 2010 at 08:15:13PM +0200

> On Sat, 2010-05-22 at 21:00 +0200, Borislav Petkov wrote:
> > Register and enable events marked as persistent right after perf events
> > has initialized.
> > 
> > Not-yet-signed-off-by: Borislav Petkov <bp@...en8.de>
> 
> Nah, this is totally wrong.
> 
> A persistent event would simply be a regular event, but created by the
> kernel and not tied to a file-desc's lifetime.

So you're saying the trace_mce_record() tracepoint for example should
be created completely internally in the kernel and cease to be a
tracepoint? Will it still be able to be selected by perf -e?

Please elaborate.

-- 
Regards/Gruss,
    Boris.
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