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perf.data documentation: Clarify HEADER_SAMPLE_TOPOLOGY format 

The perf.data file format documentation for HEADER_SAMPLE_TOPOLOGY
specifies the layout in a confusing manner that doesn't match the rest
of the document.  This patch attempts to describe things consistent with
the rest of the file.

Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Chong Jiang <chongjiang@chromium.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Simon Que <sque@chromium.org>
Link: http://lkml.kernel.org/r/alpine.DEB.2.21.1908011425240.14303@macbook-air
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
alistair/sunxi64-5.4-dsi
Vince Weaver 2019-08-01 14:30:43 -04:00 committed by Arnaldo Carvalho de Melo
parent 38fe26b46f
commit 3143906c27
1 changed files with 14 additions and 9 deletions
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23
tools/perf/Documentation/perf.data-file-format.txt
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@ -298,16 +298,21 @@ 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
u64 version; // Currently 1
u64 block_size_bytes; // /sys/devices/system/memory/block_size_bytes
u64 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>
struct memory_node {
u64 node_id; // node index
u64 size; // size of bitmap
struct bitmap {
/* size of bitmap again */
u64 bitmapsize;
/* bitmap of memory indexes that belongs to node */
/* /sys/devices/system/node/node<NODE>/memory<INDEX> */
u64 entries[(bitmapsize/64)+1];
}
}[count];
The MEM_TOPOLOGY can be displayed with following command: