linux-kernel - [PATCH 33/41] perf evsel: Add 'immediate' option

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Message-Id: <1405332185-4050-34-git-send-email-adrian.hunter@intel.com>
Date:	Mon, 14 Jul 2014 13:02:57 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: [PATCH 33/41] 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 <adrian.hunter@...el.com>
---
 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 40626e5..90f58cd 100644
--- 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
index 8dfec05..d7f93ce 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;
-- 
1.8.3.2

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