1 files changed, 15 insertions, 10 deletions

diff --git a/tools/perf/Documentation/perf.data-file-format.txt b/tools/perf/Documentation/perf.data-file-format.txt
index d030c87ed9f5..b0152e1095c5 100644
--- a/tools/perf/Documentation/perf.data-file-format.txt
+++ b/tools/perf/Documentation/perf.data-file-format.txt
@@ -298,16 +298,21 @@ Physical memory map and its node assignments.
 
 The format of data in MEM_TOPOLOGY is as follows:
 
-   0 - version          | for future changes
-   8 - block_size_bytes | /sys/devices/system/memory/block_size_bytes
-  16 - count            | number of nodes
-
-For each node we store map of physical indexes:
-
-  32 - node id          | node index
-  40 - size             | size of bitmap
-  48 - bitmap           | bitmap of memory indexes that belongs to node
-                        | /sys/devices/system/node/node<NODE>/memory<INDEX>
+        u64 version;            // Currently 1
+        u64 block_size_bytes;   // /sys/devices/system/memory/block_size_bytes
+        u64 count;              // number of nodes
+
+struct memory_node {
+        u64 node_id;            // node index
+        u64 size;               // size of bitmap
+        struct bitmap {
+                /* size of bitmap again */
+                u64 bitmapsize;
+                /* bitmap of memory indexes that belongs to node     */
+                /* /sys/devices/system/node/node<NODE>/memory<INDEX> */
+                u64 entries[(bitmapsize/64)+1];
+        }
+}[count];
 
 The MEM_TOPOLOGY can be displayed with following command: