[PATCH v0 25/71] perf evsel: Add 'no_aux_samples' option

[Alexander Shishkin]

From: Adrian Hunter <adrian.hunter@xxxxxxxxx>

Add an option to prevent additional
samples being added to a selected
event by perf_evsel__config().

This is needed when using the sched_switch
tracepoint to follow object code execution.
Since sched_switch will be used only for
switch information, additional sampling is
wasteful.

Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
 tools/perf/util/evsel.c | 6 +++---
 tools/perf/util/evsel.h | 1 +
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 7b510fd..dbf737c 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -596,7 +596,7 @@ void perf_evsel__config(struct perf_evsel *evsel,
 		attr->mmap_data = track;
 	}
 
-	if (opts->call_graph) {
+	if (opts->call_graph && !evsel->no_aux_samples) {
 		perf_evsel__set_sample_bit(evsel, CALLCHAIN);
 
 		if (opts->call_graph == CALLCHAIN_DWARF) {
@@ -619,7 +619,7 @@ void perf_evsel__config(struct perf_evsel *evsel,
 	     target__has_cpu(&opts->target) || per_cpu))
 		perf_evsel__set_sample_bit(evsel, TIME);
 
-	if (opts->raw_samples) {
+	if (opts->raw_samples && !evsel->no_aux_samples) {
 		perf_evsel__set_sample_bit(evsel, TIME);
 		perf_evsel__set_sample_bit(evsel, RAW);
 		perf_evsel__set_sample_bit(evsel, CPU);
@@ -632,7 +632,7 @@ void perf_evsel__config(struct perf_evsel *evsel,
 		attr->watermark = 0;
 		attr->wakeup_events = 1;
 	}
-	if (opts->branch_stack) {
+	if (opts->branch_stack && !evsel->no_aux_samples) {
 		perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
 		attr->branch_sample_type = opts->branch_stack;
 	}
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 8120eeb..af38e2c 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -83,6 +83,7 @@ struct perf_evsel {
 	int			is_pos;
 	bool 			supported;
 	bool 			needs_swap;
+	bool			no_aux_samples;
 	/* parse modifier helper */
 	int			exclude_GH;
 	int			nr_members;
-- 
1.8.5.1

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