Linux 4.7 (86e7972f690c1017fd086cdfe53d8524e68c661c) introduces PERF_EVENT_IOC_PAUSE_OUTPUT feature. Document it. Signed-off-by: Wang Nan <wangnan0@xxxxxxxxxx> Cc: Michael Kerrisk <mtk.manpages@xxxxxxxxx> --- man2/perf_event_open.2 | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/man2/perf_event_open.2 b/man2/perf_event_open.2 index fade28c..2d3acad 100644 --- a/man2/perf_event_open.2 +++ b/man2/perf_event_open.2 @@ -2865,7 +2865,18 @@ The argument is a BPF program file descriptor that was created by a previous .BR bpf (2) system call. -.SS Using prctl(2) +.TP +.BR PERF_EVENT_IOC_PAUSE_OUTPUT " (since Linux 4.7)" +.\" commit 86e7972f690c1017fd086cdfe53d8524e68c661c +This allows pausing and resuming the event's ring-buffer. A +paused ring-buffer does not prevent samples generation, but simply +discards them. The discarded samples are considered lost, causes +.BR PERF_RECORD_LOST +to be generated when possible. + +The argument is an integer. Nonzero value pauses the ring-buffer, +zero value resumes the ring-buffer. +.SS Using prctl A process can enable or disable all the event groups that are attached to it using the .BR prctl (2) -- 2.10.1 -- 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
