perf ordered_events: Add first_time() method

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

Signed-off-by: Jiri Olsa <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Dmitry Levin <[email protected]>
Cc: Eugene Syromiatnikov <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: Luis Cláudio Gonçalves <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Steven Rostedt (VMware) <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: https://lkml.kernel.org/n/[email protected]
[ split from a larger patch ]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

diff --git a/tools/perf/util/ordered-events.c b/tools/perf/util/ordered-events.c
index 46965643020b00e933e738724325f0abe176418a..897589507d97cba2c09ccb6676bd25e02212c9d8 100644 (file)
--- 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 f352af20e167b13196008c9c092f8bf4879fdc64..0920fb0ec6cc7f98c5c84a56555eb9c49997c81a 100644 (file)
--- 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)