netdev - Re: [PATCH 1/6] perf: Add new type PERF_TYPE

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Date:   Thu, 30 Nov 2017 01:43:06 +0000
From:   Song Liu <songliubraving@...com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     Steven Rostedt <rostedt@...dmis.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        David Miller <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH 1/6] perf: Add new type PERF_TYPE_PROBE


> On Nov 23, 2017, at 2:22 AM, Peter Zijlstra <peterz@...radead.org> 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