On Nov 23, 2017, at 2:22 AM, Peter Zijlstra [off-list ref] wrote:

On Wed, Nov 15, 2017 at 09:23:33AM -0800, Song Liu wrote:

quoted

A new perf type PERF_TYPE_PROBE is added to allow creating [k,u]probe
with perf_event_open. These [k,u]probe are associated with the file
decriptor created by perf_event_open, thus are easy to clean when
the file descriptor is destroyed.

Struct probe_desc and two flags, is_uprobe and is_return, are added
to describe the probe being created with perf_event_open.

quoted

---
include/uapi/linux/perf_event.h | 35 +++++++++++++++++++++++++++++++++--
1 file changed, 33 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 362493a..cc42d59 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h

@@ -33,6 +33,7 @@ enum perf_type_id {

	PERF_TYPE_HW_CACHE			= 3,
	PERF_TYPE_RAW				= 4,
	PERF_TYPE_BREAKPOINT			= 5,
+	PERF_TYPE_PROBE				= 6,

Not required.. these fixed types are mostly legacy at this point.

Dear Peter,

Thanks a lot for your feedback. I have incorporated them in the next version
(sending soon). 

I added two fixed types (PERF_TYPE_KPROBE and PERF_TYPE_UPROBE) in the new 
version. I know that perf doesn't need them any more. But currently bcc still 
relies on these fixed types to use the probes/tracepoints. 

Thanks,
Song