linux-kernel - [PATCH][manpages 1/2] perf_event_open.2: Document PERF_EVENT_IOC_PAUSE

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Date:	Mon, 28 Mar 2016 10:15:47 +0000
From:	Wang Nan <wangnan0@...wei.com>
To:	<peterz@...radead.org>, <vince@...ter.net>,
	<mtk.manpages@...il.com>
CC:	<linux-kernel@...r.kernel.org>, <linux-man@...r.kernel.org>,
	<pi3orama@....com>, <lizefan@...wei.com>,
	Wang Nan <wangnan0@...wei.com>
Subject: [PATCH][manpages 1/2] perf_event_open.2: Document PERF_EVENT_IOC_PAUSE_OUTPUT

Signed-off-by: Wang Nan <wangnan0@...wei.com>
---
 man2/perf_event_open.2 | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index c90fc51..b232cba 100644
--- a/man2/perf_event_open.2
+++ b/man2/perf_event_open.2
@@ -2719,6 +2719,17 @@ The argument is a BPF program file descriptor that was created by
 a previous
 .BR bpf (2)
 system call.
+.TP
+.BR PERF_EVENT_IOC_PAUSE_OUTPUT " (since Linux 4.6)"
+.\" commit ? (http://lkml.kernel.org/g/1459147292-239310-2-git-send-email-wangnan0@huawei.com)
+This allows pausing and resuming the event's ring-buffer. A
+paused ring-buffer does not prevent samples generation, but simply
+discards them. The discarded samples are considered lost, causes
+.BR PERF_RECORD_LOST
+to be generated when possible.
+
+The argument is an integer. Nonzero value pauses the ring-buffer,
+zero value resumes the ring-buffer.
 .SS Using prctl
 A process can enable or disable all the event groups that are
 attached to it using the
-- 
1.8.3.4