perf_event_open.2: 4.1 data_offset and data_size fields

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@linux.intel.com>

	perf: Add data_{offset,size} to user_page

	Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
	Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
	Cc: Borislav Petkov <bp@alien8.de>
	Cc: Frederic Weisbecker <fweisbec@gmail.com>
	Cc: H. Peter Anvin <hpa@zytor.com>
	Cc: Kaixu Xia <kaixu.xia@linaro.org>
	Cc: Linus Torvalds <torvalds@linux-foundation.org>
	Cc: Mike Galbraith <efault@gmx.de>
	Cc: Paul Mackerras <paulus@samba.org>
	Cc: Robert Richter <rric@kernel.org>
	Cc: Stephane Eranian <eranian@google.com>
	Cc: Thomas Gleixner <tglx@linutronix.de>
	Cc: acme@infradead.org
	Cc: adrian.hunter@intel.com
	Cc: kan.liang@intel.com
	Cc: markus.t.metzger@intel.com
	Cc: mathieu.poirier@linaro.org
Link: http://lkml.kernel.org/r/1421237903-181015-2-git-send-email-alexander.shishkin@linux.intel.com
	Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index 3d170e7a4fd61572ee0169c701fccd2314641932..d71f6979a1fdcb1316244064fc767d752d380e99 100644 (file)
--- a/man2/perf_event_open.2
+++ b/man2/perf_event_open.2
@@ -1414,6 +1414,9 @@ 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
@@ -1630,6 +1633,16 @@ 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.