2 files changed, 9 insertions, 0 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 17b63105f2aa..0fcbf34a4f73 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -160,6 +160,7 @@ struct perf_counter_hw_event {
 #define PERF_COUNTER_IOC_ENABLE         _IO ('$', 0)
 #define PERF_COUNTER_IOC_DISABLE        _IO ('$', 1)
 #define PERF_COUNTER_IOC_REFRESH        _IOW('$', 2, u32)
+#define PERF_COUNTER_IOC_RESET          _IO ('$', 3)
 
 /*
  * Structure of the page that can be mapped via mmap
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index ba5e921e1f36..6e6834e0587e 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1288,6 +1288,11 @@ static unsigned int perf_poll(struct file *file, poll_table *wait)
         return events;
 }
 
+static void perf_counter_reset(struct perf_counter *counter)
+{
+        atomic_set(&counter->count, 0);
+}
+
 static long perf_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
         struct perf_counter *counter = file->private_data;
@@ -1303,6 +1308,9 @@ static long perf_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
         case PERF_COUNTER_IOC_REFRESH:
                 perf_counter_refresh(counter, arg);
                 break;
+        case PERF_COUNTER_IOC_RESET:
+                perf_counter_reset(counter);
+                break;
         default:
                 err = -ENOTTY;
         }