Re: [PATCH 1/6] perf: Add new type PERF_TYPE_PROBE

[Song Liu]

> On Nov 23, 2017, at 2:22 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> 
> On Wed, Nov 15, 2017 at 09:23:33AM -0800, Song Liu wrote:
>> 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.
> 
>> ---
>> 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