1 files changed, 16 insertions, 0 deletions

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 86c44ae66d43..6c5013a71714 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -530,6 +530,22 @@ struct perf_event_mmap_page {
         __u64   data_tail;              /* user-space written tail */
         __u64   data_offset;            /* where the buffer starts */
         __u64   data_size;              /* data buffer size */
+
+        /*
+         * AUX area is defined by aux_{offset,size} fields that should be set
+         * by the userspace, so that
+         *
+         *   aux_offset >= data_offset + data_size
+         *
+         * prior to mmap()ing it. Size of the mmap()ed area should be aux_size.
+         *
+         * Ring buffer pointers aux_{head,tail} have the same semantics as
+         * data_{head,tail} and same ordering rules apply.
+         */
+        __u64   aux_head;
+        __u64   aux_tail;
+        __u64   aux_offset;
+        __u64   aux_size;
 };
 
 #define PERF_RECORD_MISC_CPUMODE_MASK           (7 << 0)