perf ordered_events: Add ordered_events__flush_time interface

Add OE_FLUSH__TIME flush type, to be able to flush only certain amount
of the queue based on the provided timestamp. It will be used in the
following patches.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Dmitry Levin <ldv@altlinux.org>
Cc: Eugene Syromiatnikov <esyr@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Luis Cláudio Gonçalves <lclaudio@uudg.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20181205160509.1168-7-jolsa@kernel.org
[ Fix the build on older systems such as centos 5 and 6 where 'time' shadows a global declaration ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/ordered-events.c

@@ -219,8 +219,7 @@ int ordered_events__queue(struct ordered_events *oe, union perf_event *event,
 	return 0;
 }
 
-static int __ordered_events__flush(struct ordered_events *oe,
-				   bool show_progress)
+static int do_flush(struct ordered_events *oe, bool show_progress)
 {
 	struct list_head *head = &oe->events;
 	struct ordered_event *tmp, *iter;
@@ -263,7 +262,8 @@ static int __ordered_events__flush(struct ordered_events *oe,
 	return 0;
 }
 
-int ordered_events__flush(struct ordered_events *oe, enum oe_flush how)
+static int __ordered_events__flush(struct ordered_events *oe, enum oe_flush how,
+				   u64 timestamp)
 {
 	static const char * const str[] = {
 		"NONE",
@@ -302,6 +302,11 @@ int ordered_events__flush(struct ordered_events *oe, enum oe_flush how)
 		break;
 	}
 
+	case OE_FLUSH__TIME:
+		oe->next_flush = timestamp;
+		show_progress = false;
+		break;
+
 	case OE_FLUSH__ROUND:
 	case OE_FLUSH__NONE:
 	default:
@@ -312,7 +317,7 @@ int ordered_events__flush(struct ordered_events *oe, enum oe_flush how)
 		   str[how], oe->nr_events);
 	pr_oe_time(oe->max_timestamp, "max_timestamp\n");
 
-	err = __ordered_events__flush(oe, show_progress);
+	err = do_flush(oe, show_progress);
 
 	if (!err) {
 		if (how == OE_FLUSH__ROUND)
@@ -328,6 +333,16 @@ int ordered_events__flush(struct ordered_events *oe, enum oe_flush how)
 	return err;
 }
 
+int ordered_events__flush(struct ordered_events *oe, enum oe_flush how)
+{
+	return __ordered_events__flush(oe, how, 0);
+}
+
+int ordered_events__flush_time(struct ordered_events *oe, u64 timestamp)
+{
+	return __ordered_events__flush(oe, OE_FLUSH__TIME, timestamp);
+}
+
 void ordered_events__init(struct ordered_events *oe, ordered_events__deliver_t deliver,
 			  void *data)
 {

tools/perf/util/ordered-events.h

@@ -19,6 +19,7 @@ enum oe_flush {
 	OE_FLUSH__ROUND,
 	OE_FLUSH__HALF,
 	OE_FLUSH__TOP,
+	OE_FLUSH__TIME,
 };
 
 struct ordered_events;
@@ -55,6 +56,7 @@ int ordered_events__queue(struct ordered_events *oe, union perf_event *event,
 			  u64 timestamp, u64 file_offset);
 void ordered_events__delete(struct ordered_events *oe, struct ordered_event *event);
 int ordered_events__flush(struct ordered_events *oe, enum oe_flush how);
+int ordered_events__flush_time(struct ordered_events *oe, u64 timestamp);
 void ordered_events__init(struct ordered_events *oe, ordered_events__deliver_t deliver,
 			  void *data);
 void ordered_events__free(struct ordered_events *oe);