perf.data documentation: Clarify HEADER_SAMPLE_TOPOLOGY format (3143906c) · Commits · 戴 / test

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>

tools/perf/Documentation/perf.data-file-format.txt

+15 −10

Original line number	Diff line number	Diff line
		@@ -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

		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>
		u64 version; // Currently 1
		u64 block_size_bytes; // /sys/devices/system/memory/block_size_bytes
		u64 count; // number of nodes

		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:

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