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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 <vincent.weaver@maine.edu>
This commit is contained in:
Dave Hansen 2016-10-15 22:02:51 -04:00 committed by Michael Kerrisk
parent dde354c979
commit 46012ba3ff
1 changed files with 19 additions and 0 deletions
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19
man2/perf_event_open.2
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@ -2551,6 +2551,25 @@ process ID of the thread starting an instruction trace.
.I tid .I tid
thread ID of the thread starting an instruction trace. thread ID of the thread starting an instruction trace.
.RE .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 .RE
.SS Overflow handling .SS Overflow handling
Events can be set to notify when a threshold is crossed, Events can be set to notify when a threshold is crossed,