[patch 04/10] perf_event_open.2: 4.1 data_offset and data_size fields

[Vince Weaver]

This manpage patch relates to the addition of the data_offset
and data_size fields to the perf_event mmap buffer, as added
in the following commit:

	commit e8c6deac69629c0cb97c3d3272f8631ef17f8f0f
	Author: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>

	perf: Add data_{offset,size} to user_page

	Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
	Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
	Cc: Borislav Petkov <bp@xxxxxxxxx>
	Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
	Cc: H. Peter Anvin <hpa@xxxxxxxxx>
	Cc: Kaixu Xia <kaixu.xia@xxxxxxxxxx>
	Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
	Cc: Mike Galbraith <efault@xxxxxx>
	Cc: Paul Mackerras <paulus@xxxxxxxxx>
	Cc: Robert Richter <rric@xxxxxxxxxx>
	Cc: Stephane Eranian <eranian@xxxxxxxxxx>
	Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
	Cc: acme@xxxxxxxxxxxxx
	Cc: adrian.hunter@xxxxxxxxx
	Cc: kan.liang@xxxxxxxxx
	Cc: markus.t.metzger@xxxxxxxxx
	Cc: mathieu.poirier@xxxxxxxxxx
	Link: http://lkml.kernel.org/r/1421237903-181015-2-git-send-email-alexander.shishkin@xxxxxxxxxxxxxxx
	Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>


Signed-off-by: Vince Weaver <vincent.weaver@xxxxxxxxx>

diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index 01ee579..8bd37da 100644
--- a/man2/perf_event_open.2
+++ b/man2/perf_event_open.2
@@ -1348,6 +1348,9 @@ struct perf_event_mmap_page {
     __u64 __reserved[120];   /* Pad to 1k */
     __u64 data_head;         /* head in the data section */
     __u64 data_tail;         /* user-space written tail */
+    __u64 data_offset;       /* where the buffer starts */
+    __u64 data_size;         /* data buffer size */
+
 }
 .fi
 .in
@@ -1564,6 +1567,16 @@ the
 .I data_tail
 value should be written by user space to reflect the last read data.
 In this case, the kernel will not overwrite unread data.
+.TP
+.IR data_offset " (since Linux 4.1)"
+.\" commit e8c6deac69629c0cb97c3d3272f8631ef17f8f0f
+Contains the offset of the location in the mmap buffer
+where perf sample data begins.
+.TP
+.IR data_size " (since Linux 4.1)"
+.\" commit e8c6deac69629c0cb97c3d3272f8631ef17f8f0f
+Contains the size of the perf sample region within
+the mmap buffer.
 .PP
 The following 2^n ring-buffer pages have the layout described below.
 
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