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Subject[tip:perf/urgent] perf data: Update documentation section on cpu topology
Commit-ID:  0c711138fa61188aa379210e9e08ac76838dea03
Gitweb: https://git.kernel.org/tip/0c711138fa61188aa379210e9e08ac76838dea03
Author: Thomas Richter <tmricht@linux.ibm.com>
AuthorDate: Mon, 28 May 2018 09:44:33 +0200
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
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@linux.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Link: http://lkml.kernel.org/r/20180528074433.16652-1-tmricht@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
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:
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