From 46012ba3ff3987523169fe85ee617ad1187405cf Mon Sep 17 00:00:00 2001 From: Dave Hansen Date: Sat, 15 Oct 2016 22:02:51 -0400 Subject: [PATCH] perf_event_open.2: PERF_RECORD_LOST_SAMPLES record type Linux 4.2 added a new record type: PERF_RECORD_LOST_SAMPLES It is generated when hardware samples (currently only Intel PEBS) are lost. Signed-off-by: Vince Weaver --- man2/perf_event_open.2 | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2 index 9f33122c2..a47df2d69 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,