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perf data: Fix perf.data documentation for HEADER_CPU_TOPOLOGY

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The 'die' info isn't in the same array as core and socket ids, and we
missed the 'dies' string list, that comes right after the 'core' +
'socket' id variable length array, followed by the VLA for the dies.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Fixes: c9cb12c5ba08 ("perf header: Add die information in CPU topology")
Link: https://lkml.kernel.org/n/tip-nubi6mxp2n8ofvlx7ph6k3h6@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2019-06-06 17:03:18 -03:00
parent 0ccdb8407a
commit 36edfb9401
1 changed files with 22 additions and 7 deletions
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29
tools/perf/Documentation/perf.data-file-format.txt
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@ -151,20 +151,35 @@ 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, die_id (for x86) 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 {
/*
* First revision of HEADER_CPU_TOPOLOGY
*
* See 'struct perf_header_string_list' definition earlier
* in this file.
*/
struct perf_header_string_list cores; /* Variable length */
struct perf_header_string_list threads; /* Variable length */
/*
* Second revision of HEADER_CPU_TOPOLOGY, older tools
* will not consider what comes next
*/
struct {
uint32_t core_id;
uint32_t die_id;
uint32_t socket_id;
} cpus[nr]; /* Variable length records */
/* 'nr' comes from previously processed HEADER_NRCPUS's nr_cpu_avail */
/*
* Third revision of HEADER_CPU_TOPOLOGY, older tools
* will not consider what comes next
*/
struct perf_header_string_list dies; /* Variable length */
uint32_t die_id[nr_cpus_avail]; /* from previously processed HEADER_NR_CPUS, VLA */
};
Example: