From: Vince Weaver <[email protected]> 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]> Acked-by: Jiri Olsa <[email protected]> Cc: Adrian Hunter <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Chong Jiang <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Simon Que <[email protected]> Link: http://lkml.kernel.org/r/alpine.DEB.2.21.1908011425240.14303@macbook-air Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> --- .../Documentation/perf.data-file-format.txt | 25 +++++++++++-------- 1 file 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: -- 2.21.0
