minor perf_event_open() clarification

minor perf_event_open() clarification

[Vince Weaver]

Clarify the perf_event_open() wakeup_events/wakeup_watermark fields a bit,
based on info from kernel commit cfeb1d90a1b1.

Signed-off-by: Vince Weaver <vincent.weaver-e7X0jjDqjFGHXe+LvDLADg@public.gmane.org>

diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
index f3850f0..14b89ae 100644
--- a/man2/perf_event_open.2
+++ b/man2/perf_event_open.2
@@ -870,6 +870,16 @@ happen before an overflow signal happens.
 Which one is used is selected by the
 .I watermark
 bitflag.
+
+.I wakeup_events
+only counts
+.B PERF_RECORD_SAMPLE
+record types.  
+To  receive a signal for every incoming
+.B PERF_RECORD
+type set
+.I wakeup_watermark
+to 1.
 .TP
 .IR "bp_type" " (Since Linux 2.6.33)"
 This chooses the breakpoint type.
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Re: minor perf_event_open() clarification

[Michael Kerrisk]

On 05/30/13 23:22, Vince Weaver wrote:
> 
> Clarify the perf_event_open() wakeup_events/wakeup_watermark fields a bit,
> based on info from kernel commit cfeb1d90a1b1.

Thanks Vince. Applied.

Cheers,

Michael


> Signed-off-by: Vince Weaver <vincent.weaver-e7X0jjDqjFGHXe+LvDLADg@public.gmane.org>
> 
> diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2
> index f3850f0..14b89ae 100644
> --- a/man2/perf_event_open.2
> +++ b/man2/perf_event_open.2
> @@ -870,6 +870,16 @@ happen before an overflow signal happens.
>  Which one is used is selected by the
>  .I watermark
>  bitflag.
> +
> +.I wakeup_events
> +only counts
> +.B PERF_RECORD_SAMPLE
> +record types.  
> +To  receive a signal for every incoming
> +.B PERF_RECORD
> +type set
> +.I wakeup_watermark
> +to 1.
>  .TP
>  .IR "bp_type" " (Since Linux 2.6.33)"
>  This chooses the breakpoint type.
> 

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