Re: [PATCH][manpages 1/2] perf_event_open.2: Document PERF_EVENT_IOC_PAUSE_OUTPUT

Michael Kerrisk (man-pages)
2016-10-21T08:56:58Z

Thanks for this patch, Wangnan.

Vince, do you have any comments?

Cheers,

Michael

On 03/28/2016 12:15 PM, Wang Nan wrote:
> Signed-off-by: Wang Nan <wangnan0@huawei.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
>

--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/