| Date | Mon, 11 Aug 2014 15:12:05 +0200 | From | Jiri Olsa <> | Subject | Re: [PATCH 34/41] perf evlist: Add 'system_wide' option |
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On Mon, Jul 14, 2014 at 01:02:58PM +0300, Adrian Hunter wrote: > Add an option to cause a selected event > to be opened always without a pid when > configured by perf_evsel__config(). > > This is needed when using the sched_switch > tracepoint to follow object code execution. > sched_switch occurs before the task > switch and so it cannot record it in a > context limited to that task. Note > that also means that sched_switch is > useless when capturing data per-thread, > as is the 'context-switches' software > event for the same reason. > > Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> > --- > tools/perf/util/evlist.c | 45 +++++++++++++++++++++++++++++++++++++-------- > tools/perf/util/evsel.c | 31 ++++++++++++++++++++++++++----- > tools/perf/util/evsel.h | 1 + > 3 files changed, 64 insertions(+), 13 deletions(-) > > diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c > index 282e83e..c295b7b 100644 > --- a/tools/perf/util/evlist.c > +++ b/tools/perf/util/evlist.c > @@ -265,17 +265,27 @@ int perf_evlist__add_newtp(struct perf_evlist *evlist, > return 0; > } > > +static int perf_evlist__nr_threads(struct perf_evlist *evlist, > + struct perf_evsel *evsel) > +{ > + if (evsel->system_wide) > + return 1; > + else > + return thread_map__nr(evlist->threads); > +}
how is 'evsel->system_wide' set?
jirka
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