[PATCH v0 26/71] perf evsel: Add 'immediate' option

[Alexander Shishkin]

From: Adrian Hunter <adrian.hunter@xxxxxxxxx>

Add an option to cause a selected event
to be enabled immediately when configured
by perf_evsel__config().

This is needed when using the sched_switch
tracepoint to follow object code execution.
By having sched_switch enabled immediately
the first sched_switch event always
precedes the start of other tracing.

Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
 tools/perf/util/evsel.c | 5 +++++
 tools/perf/util/evsel.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index dbf737c..5fcd7cb 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -661,6 +661,11 @@ void perf_evsel__config(struct perf_evsel *evsel,
 	 */
 	if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel))
 		attr->enable_on_exec = 1;
+
+	if (evsel->immediate) {
+		attr->disabled = 0;
+		attr->enable_on_exec = 0;
+	}
 }
 
 int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index af38e2c..de1b36e 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -84,6 +84,7 @@ struct perf_evsel {
 	bool 			supported;
 	bool 			needs_swap;
 	bool			no_aux_samples;
+	bool			immediate;
 	/* parse modifier helper */
 	int			exclude_GH;
 	int			nr_members;
-- 
1.8.5.1

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