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perf_event_open.2: PERF_COUNT_SW_DUMMY support 

Support for the PERF_COUNT_SW_DUMMY event type was added in
Linux 3.12.

Signed-off-by: Vince Weaver <vincent.weaver@maine.edu>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Vince Weaver 2013-11-06 13:28:50 -05:00 committed by Michael Kerrisk
parent 4d4cecd6fa
commit dab3845542
1 changed files with 7 additions and 0 deletions
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man2/perf_event_open.2
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@ -468,6 +468,13 @@ This counts the number of emulation faults.
The kernel sometimes traps on unimplemented instructions
and emulates them for user space.
This can negatively impact performance.
.TP
.BR PERF_COUNT_SW_DUMMY " (Since Linux 3.12)"
This is a placeholder event that counts nothing.
Informational sample record types such as mmap or comm
must be associated with an active event.
This dummy event allows gathering such records without requiring
a counting event.
.RE
.RS