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Message-ID: <1459160147-240738-1-git-send-email-wangnan0@huawei.com> 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
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