Messages in this thread | | | Subject | Re: [patch] perf_event_open.2: PERF_RECORD_LOST_SAMPLES record type | From | "Michael Kerrisk (man-pages)" <> | Date | Mon, 17 Oct 2016 08:46:10 +0200 |
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Hello Vince,
On 10/16/2016 04:02 AM, Vince Weaver wrote: > > Linux 4.2 added a new record type: PERF_RECORD_LOST_SAMPLES > It is generated when hardware samples (currently only Intel PEBS) > are lost.
Thanks! Applied!
Cheers,
Michael
> Signed-off-by: Vince Weaver <vincent.weaver@maine.edu> > > diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2 > index 9f33122..a47df2d 100644 > --- a/man2/perf_event_open.2 > +++ b/man2/perf_event_open.2 > @@ -2551,6 +2551,25 @@ process ID of the thread starting an instruction trace. > .I tid > thread ID of the thread starting an instruction trace. > .RE > +.TP > +.BR PERF_RECORD_LOST_SAMPLES " (since Linux 4.2)" > +\" f38b0dbb491a6987e198aa6b428db8692a6480f8 > +When using hardware sampling (such as Intel PEBS) this record > +indicates some number of samples may have been lost. > + > +.in +4n > +.nf > +struct { > + struct perf_event_header header; > + u64 lost; > + struct sample_id sample_id; > +}; > +.fi > +.RS > +.TP > +.I lost > +the number of potentially lost samples. > +.RE > .RE > .SS Overflow handling > Events can be set to notify when a threshold is crossed, >
-- 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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