linux-kernel - Re: [PATCH 1/3] perf: add a dummy software event to keep tracking

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Message-ID: <20130826161624.GC10002@twins.programming.kicks-ass.net>
Date:	Mon, 26 Aug 2013 18:16:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Adrian Hunter <adrian.hunter@...el.com>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, Mike Galbraith <efault@....de>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 1/3] perf: add a dummy software event to keep tracking

On Mon, Aug 26, 2013 at 10:53:05AM -0300, Arnaldo Carvalho de Melo wrote:
> Em Mon, Aug 26, 2013 at 04:15:34PM +0300, Adrian Hunter escreveu:
> > On 07/08/13 16:30, Adrian Hunter wrote:
> > > When an event is disabled the "tracking" events
> > > selected by the 'mmap', 'comm' and 'task' bits of
> > > struct perf_event_attr, are also disabled.  However,
> > > the information those events provide is necessary to
> > > resolve symbols for when the main event is re-enabled.
> > > 
> > > The "tracking" events can be kept enabled by putting
> > > them on another event, but that requires an event
> > > that otherwise does nothing.  A new software event
> > > PERF_COUNT_SW_DUMMY is added for that purpose.
> > > 
> > > Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> > 
> > Any comments?
> 
> Ok with me, Peter?

Yeah I suppose so.. I don't really like it and I've made a start at
looking at the problem twice now but never got anywhere, so sure lets go
with this.

Acked-by: Peter Zijlstra <peterz@...radead.org>
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