diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index c8c1dfc2..f612941 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -258,6 +258,14 @@
 	PERF_EVENT_COMM			= 3,
 
 	/*
+	 * struct {
+	 * 	struct perf_event_header	header;
+	 * 	u64				irq_period;
+	 * };
+	 */
+	PERF_EVENT_PERIOD		= 4,
+
+	/*
 	 * When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
 	 * will be PERF_RECORD_*
 	 *
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 64113e6..db02eb1 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1046,7 +1046,9 @@
 	return 0;
 }
 
-void perf_adjust_freq(struct perf_counter_context *ctx)
+static void perf_log_period(struct perf_counter *counter, u64 period);
+
+static void perf_adjust_freq(struct perf_counter_context *ctx)
 {
 	struct perf_counter *counter;
 	u64 irq_period;
@@ -1072,6 +1074,8 @@
 		if (!irq_period)
 			irq_period = 1;
 
+		perf_log_period(counter, irq_period);
+
 		counter->hw.irq_period = irq_period;
 		counter->hw.interrupts = 0;
 	}
@@ -2407,6 +2411,40 @@
 }
 
 /*
+ *
+ */
+
+static void perf_log_period(struct perf_counter *counter, u64 period)
+{
+	struct perf_output_handle handle;
+	int ret;
+
+	struct {
+		struct perf_event_header	header;
+		u64				time;
+		u64				period;
+	} freq_event = {
+		.header = {
+			.type = PERF_EVENT_PERIOD,
+			.misc = 0,
+			.size = sizeof(freq_event),
+		},
+		.time = sched_clock(),
+		.period = period,
+	};
+
+	if (counter->hw.irq_period == period)
+		return;
+
+	ret = perf_output_begin(&handle, counter, sizeof(freq_event), 0, 0);
+	if (ret)
+		return;
+
+	perf_output_put(&handle, freq_event);
+	perf_output_end(&handle);
+}
+
+/*
  * Generic counter overflow handling.
  */