[tip:perf/urgent] perf data: Update documentation section on cpu topology

[tip-bot for Thomas Richter]

Commit-ID:  0c711138fa61188aa379210e9e08ac76838dea03
Gitweb:     https://git.kernel.org/tip/0c711138fa61188aa379210e9e08ac76838dea03
Author:     Thomas Richter <tmricht@xxxxxxxxxxxxx>
AuthorDate: Mon, 28 May 2018 09:44:33 +0200
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Wed, 30 May 2018 15:39:13 -0300

perf data: Update documentation section on cpu topology

Add an explanation of each cpu's core and socket identifier to the
perf.data file format documentation.

Signed-off-by: Thomas Richter <tmricht@xxxxxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: Hendrik Brueckner <brueckner@xxxxxxxxxxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/20180528074433.16652-1-tmricht@xxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/Documentation/perf.data-file-format.txt | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/tools/perf/Documentation/perf.data-file-format.txt b/tools/perf/Documentation/perf.data-file-format.txt
index d00f0d51cab8..c57904a526ce 100644
--- a/tools/perf/Documentation/perf.data-file-format.txt
+++ b/tools/perf/Documentation/perf.data-file-format.txt
@@ -153,10 +153,18 @@ struct {
 	HEADER_CPU_TOPOLOGY = 13,
 
 String lists defining the core and CPU threads topology.
+The string lists are followed by a variable length array
+which contains core_id and socket_id of each cpu.
+The number of entries can be determined by the size of the
+section minus the sizes of both string lists.
 
 struct {
        struct perf_header_string_list cores; /* Variable length */
        struct perf_header_string_list threads; /* Variable length */
+       struct {
+	      uint32_t core_id;
+	      uint32_t socket_id;
+       } cpus[nr]; /* Variable length records */
 };
 
 Example: