---

yaml --- r: 147319 b: refs/heads/master c: c457810 h: refs/heads/master i: 147317: f8ad746 147315: bf7c339 147311: 3e01645 v: v3
git-mirror · Apr 6, 2009 · f08e718 · f08e718
1 parent dd477f5
commit f08e718
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Showing 3 changed files with 12 additions and 3 deletions.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 8a057d84912f36e53f970c4d177cb4bb6b2f9e08
+refs/heads/master: c457810ab4a825161aec6ef71b581e1bc8febd1a
diff --git a/trunk/include/linux/perf_counter.h b/trunk/include/linux/perf_counter.h
@@ -145,7 +145,7 @@ struct perf_counter_hw_event {
 				__reserved_1   : 53;
 
 	__u32			extra_config_len;
-	__u32			__reserved_4;
+	__u32			wakeup_events;	/* wakeup every n events */
 
 	__u64			__reserved_2;
 	__u64			__reserved_3;
@@ -321,6 +321,7 @@ struct perf_mmap_data {
 	int				nr_pages;
 	atomic_t			wakeup;
 	atomic_t			head;
+	atomic_t			events;
 	struct perf_counter_mmap_page   *user_page;
 	void 				*data_pages[0];
 };

diff --git a/trunk/kernel/perf_counter.c b/trunk/kernel/perf_counter.c
@@ -1760,7 +1760,15 @@ static void perf_output_copy(struct perf_output_handle *handle,
 
 static void perf_output_end(struct perf_output_handle *handle)
 {
-	if (handle->wakeup)
+	int wakeup_events = handle->counter->hw_event.wakeup_events;
+
+	if (wakeup_events) {
+		int events = atomic_inc_return(&handle->data->events);
+		if (events >= wakeup_events) {
+			atomic_sub(wakeup_events, &handle->data->events);
+			__perf_output_wakeup(handle);
+		}
+	} else if (handle->wakeup)
 		__perf_output_wakeup(handle);
 	rcu_read_unlock();
 }