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

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Message-ID: <20130826135305.GA1885@ghostprotocols.net>
Date:	Mon, 26 Aug 2013 10:53:05 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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

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?

- Arnaldo
 
> > ---
> >  include/uapi/linux/perf_event.h | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
> > index 62c25a2..9e28422 100644
> > --- a/include/uapi/linux/perf_event.h
> > +++ b/include/uapi/linux/perf_event.h
> > @@ -109,6 +109,7 @@ enum perf_sw_ids {
> >  	PERF_COUNT_SW_PAGE_FAULTS_MAJ		= 6,
> >  	PERF_COUNT_SW_ALIGNMENT_FAULTS		= 7,
> >  	PERF_COUNT_SW_EMULATION_FAULTS		= 8,
> > +	PERF_COUNT_SW_DUMMY			= 9,
> >  
> >  	PERF_COUNT_SW_MAX,			/* non-ABI */
> >  };
> > 
--
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