linux-kernel - [patch] perf.data documentation clarify HEADER_SAMPLE

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Message-ID: <alpine.DEB.2.21.1908011425240.14303@macbook-air>
Date:   Thu, 1 Aug 2019 14:30:43 -0400 (EDT)
From:   Vince Weaver <vincent.weaver@...ne.edu>
To:     linux-kernel@...r.kernel.org
cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Chong Jiang <chongjiang@...omium.org>,
        Simon Que <sque@...omium.org>
Subject: [patch] 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@...ne.edu>

diff --git a/tools/perf/Documentation/perf.data-file-format.txt b/tools/perf/Documentation/perf.data-file-format.txt
index 5f54feb19977..6a7dceaae709 100644
--- a/tools/perf/Documentation/perf.data-file-format.txt
+++ b/tools/perf/Documentation/perf.data-file-format.txt
@@ -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: