linux-kernel - [tip:perf/core] perf ordered_events: Add first

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Date:   Tue, 18 Dec 2018 06:28:43 -0800
From:   tip-bot for Jiri Olsa <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     fweisbec@...il.com, esyr@...hat.com, peterz@...radead.org,
        namhyung@...nel.org, lclaudio@...g.org, rostedt@...dmis.org,
        mingo@...nel.org, tglx@...utronix.de, acme@...hat.com,
        hpa@...or.com, linux-kernel@...r.kernel.org, jolsa@...nel.org,
        ldv@...linux.org, alexander.shishkin@...ux.intel.com,
        adrian.hunter@...el.com
Subject: [tip:perf/core] perf ordered_events: Add first_time() method

Commit-ID:  83356b3d124af5ae472ce1358222f6b7749d2322
Gitweb:     https://git.kernel.org/tip/83356b3d124af5ae472ce1358222f6b7749d2322
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Thu, 6 Dec 2018 14:38:52 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 17 Dec 2018 15:02:17 -0300

perf ordered_events: Add first_time() method

To get the timestamp in the first event in the queue.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Dmitry Levin <ldv@...linux.org>
Cc: Eugene Syromiatnikov <esyr@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Luis Cláudio Gonçalves <lclaudio@...g.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt (VMware) <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: https://lkml.kernel.org/n/tip-appp27jw1ul8kgg872j43r5o@git.kernel.org
[ split from a larger patch ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/ordered-events.c | 11 +++++++++++
 tools/perf/util/ordered-events.h |  1 +
 2 files changed, 12 insertions(+)

diff --git a/tools/perf/util/ordered-events.c b/tools/perf/util/ordered-events.c
index 46965643020b..897589507d97 100644
--- a/tools/perf/util/ordered-events.c
+++ b/tools/perf/util/ordered-events.c
@@ -343,6 +343,17 @@ int ordered_events__flush_time(struct ordered_events *oe, u64 timestamp)
 	return __ordered_events__flush(oe, OE_FLUSH__TIME, timestamp);
 }
 
+u64 ordered_events__first_time(struct ordered_events *oe)
+{
+	struct ordered_event *event;
+
+	if (list_empty(&oe->events))
+		return 0;
+
+	event = list_first_entry(&oe->events, struct ordered_event, list);
+	return event->timestamp;
+}
+
 void ordered_events__init(struct ordered_events *oe, ordered_events__deliver_t deliver,
 			  void *data)
 {
diff --git a/tools/perf/util/ordered-events.h b/tools/perf/util/ordered-events.h
index f352af20e167..0920fb0ec6cc 100644
--- a/tools/perf/util/ordered-events.h
+++ b/tools/perf/util/ordered-events.h
@@ -61,6 +61,7 @@ void ordered_events__init(struct ordered_events *oe, ordered_events__deliver_t d
 			  void *data);
 void ordered_events__free(struct ordered_events *oe);
 void ordered_events__reinit(struct ordered_events *oe);
+u64 ordered_events__first_time(struct ordered_events *oe);
 
 static inline
 void ordered_events__set_alloc_size(struct ordered_events *oe, u64 size)