linux-kernel - [tip:perf/core] perf evlist: Introduce set_filter

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Date:	Thu, 26 Feb 2015 03:31:31 -0800
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	namhyung@...nel.org, jolsa@...hat.com, tglx@...utronix.de,
	fweisbec@...il.com, mingo@...nel.org, adrian.hunter@...el.com,
	dsahern@...il.com, eranian@...gle.com, dzickus@...hat.com,
	peterz@...radead.org, efault@....de, hpa@...or.com,
	linux-kernel@...r.kernel.org, bp@...e.de, acme@...hat.com
Subject: [tip:perf/core] perf evlist: Introduce set_filter_pid method

Commit-ID:  cfd70a26aadf0a9af80bbce035e5760736727a94
Gitweb:     http://git.kernel.org/tip/cfd70a26aadf0a9af80bbce035e5760736727a94
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Sat, 21 Feb 2015 10:09:55 -0800
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Sun, 22 Feb 2015 22:14:25 -0300

perf evlist: Introduce set_filter_pid method

To filter out events for a certain pid, for instance, when tracing
system wide, so that the tracer itself doesn't creates an event loop.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: David Ahern <dsahern@...il.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Mike Galbraith <efault@....de>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-byoia9dzu4gmkdv87etnd9zf@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/evlist.c | 13 +++++++++++++
 tools/perf/util/evlist.h |  1 +
 2 files changed, 14 insertions(+)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index a8b2c57..39302a4 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -1085,6 +1085,19 @@ int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter)
 	return err;
 }
 
+int perf_evlist__set_filter_pid(struct perf_evlist *evlist, pid_t pid)
+{
+	char *filter;
+	int ret;
+
+	if (asprintf(&filter, "common_pid != %d", pid) < 0)
+		return -1;
+
+	ret = perf_evlist__set_filter(evlist, filter);
+	free(filter);
+	return ret;
+}
+
 bool perf_evlist__valid_sample_type(struct perf_evlist *evlist)
 {
 	struct perf_evsel *pos;
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index c94a9e0..715fa3a 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -77,6 +77,7 @@ int perf_evlist__add_newtp(struct perf_evlist *evlist,
 			   const char *sys, const char *name, void *handler);
 
 int perf_evlist__set_filter(struct perf_evlist *evlist, const char *filter);
+int perf_evlist__set_filter_pid(struct perf_evlist *evlist, pid_t pid);
 
 struct perf_evsel *
 perf_evlist__find_tracepoint_by_id(struct perf_evlist *evlist, int id);
--
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