linux-kernel - Re: [PATCH v5 v5 1/3] docs: tracing/fprobe: Document list filters and :entry/:exit

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Message-Id: <20260129093508.5064b3782a40811cbcd8cb7b@kernel.org>
Date: Thu, 29 Jan 2026 09:35:08 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Seokwoo Chung <seokwoo.chung130@...il.com>
Cc: Steven Rostedt <rostedt@...dmis.org>, mhiramat@...nel.org,
 corbet@....net, shuah@...nel.org, mathieu.desnoyers@...icios.com,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v5 v5 1/3] docs: tracing/fprobe: Document list filters
 and :entry/:exit

Hi Ryan,

On Sun, 25 Jan 2026 15:23:17 -0500
Seokwoo Chung <seokwoo.chung130@...il.com> wrote:

> On Tue, Jan 20, 2026 at 03:53:40PM -0500, Steven Rostedt wrote:
> > On Sat, 17 Jan 2026 20:18:13 -0500
> > "Seokwoo Chung (Ryan)" <seokwoo.chung130@...il.com> wrote:
> > 
> > > Update fprobe event documentation to describe comma-separated symbol lists,
> > > exclusions, and explicit suffixes.
> > 
> > Usually, the documentation updates comes *after* the changes.
> > 
> > -- Steve
> > 
> Thanks for the comment. As you noticed, I sent another patch since I forgot to
> put log. That said, please let me know if you want me to continue on this
> series. My apologies on the ordering. I noted after Masami mentioned but I
> misordered when sending. Thank you.

Sorry for replying so late,
Can you fix the kernel test robot's error? I think it is almost done.

Thank you,

> 
> Best regards,
> Ryan Chung
> > > 
> > > Signed-off-by: Seokwoo Chung (Ryan) <seokwoo.chung130@...il.com>
> > > ---
> > >  Documentation/trace/fprobetrace.rst | 17 ++++++++++++++---
> > >  1 file changed, 14 insertions(+), 3 deletions(-)
> > > 
> > > diff --git a/Documentation/trace/fprobetrace.rst b/Documentation/trace/fprobetrace.rst
> > > index b4c2ca3d02c1..bbcfd57f0005 100644
> > > --- a/Documentation/trace/fprobetrace.rst
> > > +++ b/Documentation/trace/fprobetrace.rst
> > > @@ -25,14 +25,18 @@ Synopsis of fprobe-events
> > >  -------------------------
> > >  ::
> > >  
> > > -  f[:[GRP1/][EVENT1]] SYM [FETCHARGS]                       : Probe on function entry
> > > -  f[MAXACTIVE][:[GRP1/][EVENT1]] SYM%return [FETCHARGS]     : Probe on function exit
> > > +  f[:[GRP1/][EVENT1]] SYM[%return] [FETCHARGS]		    : Single function
> > > +  f[:[GRP1/][EVENT1]] SYM[,[!]SYM[,...]][:entry|:exit] [FETCHARGS] :Multiple
> > > +  function
> > >    t[:[GRP2/][EVENT2]] TRACEPOINT [FETCHARGS]                : Probe on tracepoint
> > >  
> > >   GRP1           : Group name for fprobe. If omitted, use "fprobes" for it.
> > >   GRP2           : Group name for tprobe. If omitted, use "tracepoints" for it.
> > >   EVENT1         : Event name for fprobe. If omitted, the event name is
> > > -                  "SYM__entry" or "SYM__exit".
> > > +		  - For a single literal symbol, the event name is
> > > +		    "SYM__entry" or "SYM__exit".
> > > +		  - For a *list or any wildcard*, an explicit [GRP1/][EVENT1] is
> > > +		    required; otherwise the parser rejects it.
> > >   EVENT2         : Event name for tprobe. If omitted, the event name is
> > >                    the same as "TRACEPOINT", but if the "TRACEPOINT" starts
> > >                    with a digit character, "_TRACEPOINT" is used.
> > > @@ -40,6 +44,13 @@ Synopsis of fprobe-events
> > >                    can be probed simultaneously, or 0 for the default value
> > >                    as defined in Documentation/trace/fprobe.rst
> > >  
> > > + SYM		: Function name or comma-separated list of symbols.
> > > +		  - SYM prefixed with "!" are exclusions.
> > > +		  - ":entry" suffix means it probes entry of given symbols
> > > +		    (default)
> > > +		  - ":exit" suffix means it probes exit of given symbols.
> > > +		  - "%return" suffix means it probes exit of SYM (single
> > > +		    symbol).
> > >   FETCHARGS      : Arguments. Each probe can have up to 128 args.
> > >    ARG           : Fetch "ARG" function argument using BTF (only for function
> > >                    entry or tracepoint.) (\*1)
> > 


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>