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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>
This commit is contained in:
Thomas Richter 2018-05-28 09:44:33 +02:00 committed by Arnaldo Carvalho de Melo
parent e2ab28521a
commit 0c711138fa
1 changed files with 8 additions and 0 deletions
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8
tools/perf/Documentation/perf.data-file-format.txt
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@ -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: