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-rw-r--r--include/uapi/linux/perf_event.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 36ce552cf6a9..c66a485a24ac 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -276,6 +276,9 @@ enum perf_event_read_format {
/*
* Hardware event_id to monitor via a performance monitoring event:
+ *
+ * @sample_max_stack: Max number of frame pointers in a callchain,
+ * should be < /proc/sys/kernel/perf_event_max_stack
*/
struct perf_event_attr {
@@ -385,7 +388,8 @@ struct perf_event_attr {
* Wakeup watermark for AUX area
*/
__u32 aux_watermark;
- __u32 __reserved_2; /* align to __u64 */
+ __u16 sample_max_stack;
+ __u16 __reserved_2; /* align to __u64 */
};
#define perf_flags(attr) (*(&(attr)->read_format + 1))