linux-kernel - RE: [PATCH 1/1] perf,tools: open event on evsel cpus and threads

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Date:	Mon, 31 Aug 2015 21:06:29 +0000
From:	"Liang, Kan" <kan.liang@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>
CC:	"jolsa@...nel.org" <jolsa@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] perf,tools: open event on evsel cpus and threads



> Em Fri, Aug 21, 2015 at 03:54:36PM +0200, Jiri Olsa escreveu:
> > On Fri, Aug 21, 2015 at 02:23:14AM -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.
> >
> > Acked-by: Jiri Olsa <jolsa@...nel.org>
> 
> Applying, I wonder if this isn't affecting other tools as well... And also

No, it doesn't affect other tools. 

> perf_evlist__open(), that has to be fixed as well, right?
>

Umm... Right.
We should fix it in perf_evlist__open as well.
IIRC, Jirka once planned to send out a cleanup patch separately for
this kind of issue (perf_evsel__enable also need to be fixed) on other
tools.

Thanks,
Kan
 
> - Arnaldo
> 
> > thanks,
> > jirka
> >
> > >
> > > Signed-off-by: Kan Liang <kan.liang@...el.com>
> > > ---
> > >  tools/perf/builtin-record.c | 2 +-
> > >  tools/perf/util/evlist.c    | 4 ++++
> > >  2 files changed, 5 insertions(+), 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);
> > > diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> > > index 373f65b..be6fde9 100644
> > > --- a/tools/perf/util/evlist.c
> > > +++ b/tools/perf/util/evlist.c
> > > @@ -1179,6 +1179,10 @@ int perf_evlist__apply_filters(struct
> perf_evlist *evlist, struct perf_evsel **e
> > >  		if (evsel->filter == NULL)
> > >  			continue;
> > >
> > > +		/*
> > > +		 * filters only work for tracepoint event, which doesn't
> have cpu limit.
> > > +		 * So evlist and evsel should always be same.
> > > +		 */
> > >  		err = perf_evsel__apply_filter(evsel, ncpus, nthreads,
> evsel->filter);
> > >  		if (err) {
> > >  			*err_evsel = evsel;
> > > --
> > > 1.8.3.1
> > >
--
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