linux-kernel - Re: [PATCH RFC 01/10] perf,tools: open event on evsel cpus and threads

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Date:	Fri, 21 Aug 2015 09:43:18 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	"Liang, Kan" <kan.liang@...el.com>
Cc:	"acme@...nel.org" <acme@...nel.org>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"jolsa@...nel.org" <jolsa@...nel.org>,
	"namhyung@...nel.org" <namhyung@...nel.org>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"eranian@...gle.com" <eranian@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RFC 01/10] perf,tools: open event on evsel cpus and
 threads

On Thu, Aug 20, 2015 at 05:24:32PM +0000, Liang, Kan wrote:
> > 
> > On Tue, Aug 18, 2015 at 05:25:37AM -0400, kan.liang@...el.com wrote:
> > > From: Kan Liang <kan.liang@...el.com>
> > >
> > > evsel may have different cpus and threads as evlist's.
> > > Use it's own cpus and threads, when open evsel in perf record.
> > >
> > > Signed-off-by: Kan Liang <kan.liang@...el.com>
> > > ---
> > >  tools/perf/builtin-record.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> > > index 25cf6b4..a0178bf 100644
> > > --- a/tools/perf/builtin-record.c
> > > +++ b/tools/perf/builtin-record.c
> > > @@ -279,7 +279,7 @@ static int record__open(struct record *rec)
> > >
> > >  	evlist__for_each(evlist, pos) {
> > >  try_again:
> > > -		if (perf_evsel__open(pos, evlist->cpus, evlist->threads) <
> > 0) {
> > > +		if (perf_evsel__open(pos, pos->cpus, pos->threads) < 0) {
> > >  			if (perf_evsel__fallback(pos, errno, msg,
> > sizeof(msg))) {
> > >  				if (verbose)
> > >  					ui__warning("%s\n", msg);
> > > --
> > > 1.8.3.1
> > >
> > 
> > dont we need then handle filters the same way?
> > like in attached change? totally untested..
> 
> Filters look only work for tracepoint event, which doesn't have cpu limit.
> So evlist and evsel should always be same.
> I think we don't need to change it.

right.. at least please make a comment about that

> 
> > 
> > jirka
> > 
> > 
> > ---
> > diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> > index 7aa039bd379a..f5cdf678d504 100644
> > --- a/tools/perf/builtin-stat.c
> > +++ b/tools/perf/builtin-stat.c
> > @@ -244,12 +244,9 @@ static void handle_initial_delay(void)
> >  	struct perf_evsel *counter;
> > 
> >  	if (initial_delay) {
> > -		const int ncpus = cpu_map__nr(evsel_list->cpus),
> > -			nthreads = thread_map__nr(evsel_list->threads);
> > -
> >  		usleep(initial_delay * 1000);
> >  		evlist__for_each(evsel_list, counter)
> > -			perf_evsel__enable(counter, ncpus, nthreads);
> > +			perf_evsel__enable(counter);
> >  	}
> >  }
> >
> 
> Agree, we need to use evsel's cpu and threads here.
> What about the code as below? It should be simpler.
> +			perf_evsel__enable(counter, cpu_map__nr(counter->cpus), thread_map__nr(counter->threads));
>  

ok, maybe I'll submit that patch as a cleanup,
it seems more sane to use evsel cpus and threads
now that we always have it there

jirka
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