[tip:perf/core] perf trace: Introduce filter_loop_pids()

[tip-bot for Arnaldo Carvalho de Melo]

Commit-ID:  dd1a50377c92321f78fa4d0601bb4d88d88670ab
Gitweb:     http://git.kernel.org/tip/dd1a50377c92321f78fa4d0601bb4d88d88670ab
Author:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Thu, 20 Jul 2017 11:17:51 -0300
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Thu, 20 Jul 2017 11:17:51 -0300

perf trace: Introduce filter_loop_pids()

No change in functionality, just to make clearer that what we want when
filtering the tracer pid in a system wide tracing session is to avoid a
feedback loop.

This also paves the way for a more interesting loop avoidance algorithm,
one that tries to figure out if we are in a ssh session, xterm, etc.

Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-5fcttc5kdjkcyp9404ezkuy9@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/builtin-trace.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 9e74e67..0ba36f0 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -2239,6 +2239,16 @@ out_enomem:
 	goto out;
 }
 
+static int trace__set_filter_loop_pids(struct trace *trace)
+{
+	int nr = 1;
+	pid_t pids[32] = {
+		getpid(),
+	};
+
+	return perf_evlist__set_filter_pids(trace->evlist, nr, pids);
+}
+
 static int trace__run(struct trace *trace, int argc, const char **argv)
 {
 	struct perf_evlist *evlist = trace->evlist;
@@ -2362,7 +2372,7 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
 	if (trace->filter_pids.nr > 0)
 		err = perf_evlist__set_filter_pids(evlist, trace->filter_pids.nr, trace->filter_pids.entries);
 	else if (thread_map__pid(evlist->threads, 0) == -1)
-		err = perf_evlist__set_filter_pid(evlist, getpid());
+		err = trace__set_filter_loop_pids(trace);
 
 	if (err < 0)
 		goto out_error_mem;