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| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-05-29 21:35:03 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-06-05 15:47:53 +0300 |
| commit | 835fbf126ce0a359626bc59b8da4e7601f01fc87 (patch) | |
| tree | a6870d81864d8839d6adb7a798ff96ea4b80d4b9 /tools/perf/Documentation | |
| parent | 8e21be4f815ca8edfee1decd87f298f92123f719 (diff) | |
| download | linux-835fbf126ce0a359626bc59b8da4e7601f01fc87.tar.xz | |
perf data: Document memory topology header: HEADER_MEM_TOPOLOGY
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>
Diffstat (limited to 'tools/perf/Documentation')
| -rw-r--r-- | tools/perf/Documentation/perf.data-file-format.txt | 24 |
1 files changed, 24 insertions, 0 deletions
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 |