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Subject[PATCH 02/85] perf data: Document memory topology header: HEADER_MEM_TOPOLOGY
Date
From: Arnaldo Carvalho de Melo <acme@redhat.com>

We forgot to update the perf.data file format document for the
HEADER_MEM_TOPOLOGY header, do it now from comments in the patch
introducing it.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Chong Jiang <chongjiang@chromium.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Simon Que <sque@chromium.org>
Fixes: e2091cedd51b ("perf tools: Add MEM_TOPOLOGY feature to perf data file")
Link: https://lkml.kernel.org/n/tip-h5lcm1nbe9ztxwm61gmadd56@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
.../Documentation/perf.data-file-format.txt | 24 +++++++++++++++++++
1 file changed, 24 insertions(+)

diff --git a/tools/perf/Documentation/perf.data-file-format.txt b/tools/perf/Documentation/perf.data-file-format.txt
index 022bb8b1c84a..99733751695b 100644
--- a/tools/perf/Documentation/perf.data-file-format.txt
+++ b/tools/perf/Documentation/perf.data-file-format.txt
@@ -272,6 +272,30 @@ struct {

Two uint64_t for the time of first sample and the time of last sample.

+ HEADER_SAMPLE_TOPOLOGY = 22,
+
+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>
+
+The MEM_TOPOLOGY can be displayed with following command:
+
+$ perf report --header-only -I
+...
+# memory nodes (nr 1, block size 0x8000000):
+# 0 [7G]: 0-23,32-69
+
HEADER_BPF_PROG_INFO = 25,

struct bpf_prog_info_linear, which contains detailed information about
--
2.20.1
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