On Thu, 5 Feb 2026 08:58:41 -0500 "Seokwoo Chung (Ryan)" <[email protected]> wrote:
> Update fprobe event documentation to describe comma-separated symbol lists, > exclusions, and explicit suffixes. > > Signed-off-by: Seokwoo Chung (Ryan) <[email protected]> > --- > 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 We also accept wildcard pattern instead of SYM. f[:[GRP1/][EVENT1]] (SYM|PATTERN)[%return] [FETCHARGS] : Single target > + f[:[GRP1/][EVENT1]] SYM[,[!]SYM[,...]][:entry|:exit] [FETCHARGS] :Multiple Hmm if this is for multiple function, we can not omit event name, so f:[GRP1/]EVNET1 SYM[,[!]SYM[,...]][:entry|:exit] [FETCHARGS] : Multiple function > + function Also, if you put this in the next line, please indent it. > 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 an explicit EVENT1 is required. (group name can be omitted) > + 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. Doesn't SYM still be a function name? In above synopsis, SYM is an entry of comma-separated list. > + - 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). And we need PATTERN here. PATTERN : Function name pattern with wildcards (You can use "*" or "?"). Thank you, > FETCHARGS : Arguments. Each probe can have up to 128 args. > ARG : Fetch "ARG" function argument using BTF (only for function > entry or tracepoint.) (\*1) > -- > 2.43.0 > > -- Masami Hiramatsu (Google) <[email protected]>
