The perf.data file format documentation for HEADER_SAMPLE_TOPOLOGY specifies the layout in a confusing manner that doesn't match the rest of the document. This patch attempts to describe things consistent with the rest of the file.
Signed-off-by: Vince Weaver <[email protected]> diff --git a/tools/perf/Documentation/perf.data-file-format.txt b/tools/perf/Documentation/perf.data-file-format.txt index 5f54feb19977..6a7dceaae709 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:
