perf evsel: Add 'immediate' option

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 precedes the start of other tracing. Signed-off-by: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Stephane Eranian <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
rtvt123 · Jul 16, 2014 · 2afd2bc · 2afd2bc
1 parent 6ff1ce7
commit 2afd2bc
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diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
@@ -681,6 +681,11 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts)
 	if (target__none(&opts->target) && perf_evsel__is_group_leader(evsel) &&
 		!opts->initial_delay)
 		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
@@ -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;