Support for the PERF_COUNT_SW_DUMMY event type was added in Linux 3.12. Signed-off-by: Vince Weaver <vincent.weaver@xxxxxxxxx> diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2 index 4ff9690..a443b6e 100644 --- a/man2/perf_event_open.2 +++ b/man2/perf_event_open.2 @@ -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 -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
