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

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

[Wang Nan]

Signed-off-by: Wang Nan <wangnan0-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
---
 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-hv44wF8Li93QT0dZR+AlfA@public.gmane.org)
+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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Re: [PATCH][manpages 1/2] perf_event_open.2: Document PERF_EVENT_IOC_PAUSE_OUTPUT

[Michael Kerrisk (man-pages)]

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-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
> ---
>  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-hv44wF8Li93QT0dZR+AlfA@public.gmane.org)
> +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/
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Re: [PATCH][manpages 1/2] perf_event_open.2: Document PERF_EVENT_IOC_PAUSE_OUTPUT

[Vince Weaver]

On Fri, 21 Oct 2016, Michael Kerrisk (man-pages) wrote:

> Thanks for this patch, Wangnan.
> 
> Vince, do you have any comments?
> 

I was catching up chronologically and was still at 4.4, and this was 
still in my queue as a 4.6 change.  I think I thought the patches looked 
good at the time, but I'll revisit them (and write some sample code to 
test out the interface) and get back to you soon.

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

[Michael Kerrisk (man-pages)]

Hi Vince,

On 21 October 2016 at 16:37, Vince Weaver <vincent.weaver-e7X0jjDqjFGHXe+LvDLADg@public.gmane.org> wrote:
> On Fri, 21 Oct 2016, Michael Kerrisk (man-pages) wrote:
>
>> Thanks for this patch, Wangnan.
>>
>> Vince, do you have any comments?
>>
>
> I was catching up chronologically and was still at 4.4, and this was
> still in my queue as a 4.6 change.  I think I thought the patches looked
> good at the time, but I'll revisit them (and write some sample code to
> test out the interface) and get back to you soon.

Note that Wang Nan sent out new patches today -- not sure if there
were any changes though.

Cheers,

Michael


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