From 241b057ce5c01a24c280f124fab60109cb562589 Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Sat, 21 Feb 2015 10:15:21 -0800 Subject: [PATCH] perf trace: Filter out the trace pid when no threads are specified To avoid tracing the tracer. Cc: Adrian Hunter Cc: Borislav Petkov Cc: David Ahern Cc: Don Zickus Cc: Frederic Weisbecker Cc: Jiri Olsa Cc: Mike Galbraith Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/n/tip-shmwd1khzpaobr3i0j1ygapg@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-trace.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 3a696aa..cb33e4c 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -2151,6 +2151,15 @@ static int trace__run(struct trace *trace, int argc, const char **argv) if (err < 0) goto out_error_open; + /* + * Better not use !target__has_task() here because we need to cover the + * case where no threads were specified in the command line, but a + * workload was, and in that case we will fill in the thread_map when + * we fork the workload in perf_evlist__prepare_workload. + */ + if (evlist->threads->map[0] == -1) + perf_evlist__set_filter_pid(evlist, getpid()); + err = perf_evlist__mmap(evlist, trace->opts.mmap_pages, false); if (err < 0) goto out_error_mmap; -- 2.7.4