[PATCH 3/4] perf tools: record min_timestamp of samples queue in ordered_samples

[Chenggang Qin]

Add a field 'min_timestamp' in struct ordered_samples to record the minimial
timestamp of the samples in ordered_samples->samples.

Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxxxxxxxxxx>
Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxx>
Cc: Yanmin Zhang <yanmin.zhang@xxxxxxxxx>
Cc: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Chenggang Qin <chenggang.qcg@xxxxxxxxxx>

---
 tools/perf/util/session.c |    3 +++
 tools/perf/util/session.h |    1 +
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 193bb6a..4e9dd66 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -708,6 +708,9 @@ int perf_session_queue_event(struct perf_session *s, union perf_event *event,
 	new->file_offset = file_offset;
 	new->event = event;
 
+	if (list_empty(&os->samples) || os->min_timestamp > timestamp)
+		os->min_timestamp = timestamp;
+
 	__queue_event(new, s);
 
 	return 0;
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index c9a6c27..7d411b9 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -18,6 +18,7 @@ struct ordered_samples {
 	u64			last_flush;
 	u64			next_flush;
 	u64			max_timestamp;
+	u64			min_timestamp;
 	struct list_head	samples;
 	struct list_head	sample_cache;
 	struct list_head	to_free;
-- 
1.7.8.rc2.5.g815b

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