1 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 18dc17d0a61c..40b324e91bf6 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -143,6 +143,17 @@ struct perf_counter_hw_event {
 #define PERF_COUNTER_IOC_ENABLE         _IO('$', 0)
 #define PERF_COUNTER_IOC_DISABLE        _IO('$', 1)
 
+/*
+ * Structure of the page that can be mapped via mmap
+ */
+struct perf_counter_mmap_page {
+        __u32   version;                /* version number of this structure */
+        __u32   compat_version;         /* lowest version this is compat with */
+        __u32   lock;                   /* seqlock for synchronization */
+        __u32   index;                  /* hardware counter identifier */
+        __s64   offset;                 /* add to hardware counter value */
+};
+
 #ifdef __KERNEL__
 /*
  * Kernel-internal data types and definitions:
@@ -278,6 +289,9 @@ struct perf_counter {
         int                             oncpu;
         int                             cpu;
 
+        /* pointer to page shared with userspace via mmap */
+        unsigned long                   user_page;
+
         /* read() / irq related data */
         wait_queue_head_t               waitq;
         /* optional: for NMIs */
@@ -361,6 +375,7 @@ extern int perf_counter_task_enable(void);
 extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
                struct perf_cpu_context *cpuctx,
                struct perf_counter_context *ctx, int cpu);
+extern void perf_counter_update_userpage(struct perf_counter *counter);
 
 extern void perf_counter_output(struct perf_counter *counter,
                                 int nmi, struct pt_regs *regs);