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| author |  Masami Hiramatsu (Google) <mhiramat@kernel.org>
| 2023-06-06 21:39:55 +0900 |
|---|---|---|
| committer | Masami Hiramatsu (Google) <mhiramat@kernel.org>
| 2023-06-06 21:39:55 +0900 |
| commit | e2d0d7b2f42dcaf924e9c891c91c9aa22cbbebce (patch) | |
| tree | c5102fa52e82681e7963a061813c880c34edb87b /kernel/trace/trace.c | |
| parent | selftests/ftrace: Add fprobe related testcases (diff) | |
| download | linux-e2d0d7b2f42dcaf924e9c891c91c9aa22cbbebce.tar.gz linux-e2d0d7b2f42dcaf924e9c891c91c9aa22cbbebce.tar.bz2 linux-e2d0d7b2f42dcaf924e9c891c91c9aa22cbbebce.zip | |
tracing/probes: Add tracepoint support on fprobe_events
Allow fprobe_events to trace raw tracepoints so that user can trace
tracepoints which don't have traceevent wrappers. This new event is
always available if the fprobe_events is enabled (thus no kconfig),
because the fprobe_events depends on the trace-event and traceporint.
e.g.
# echo 't sched_overutilized_tp' >> dynamic_events
# echo 't 9p_client_req' >> dynamic_events
# cat dynamic_events
t:tracepoints/sched_overutilized_tp sched_overutilized_tp
t:tracepoints/_9p_client_req 9p_client_req
The event name is based on the tracepoint name, but if it is started
with digit character, an underscore '_' will be added.
NOTE: to avoid further confusion, this renames TPARG_FL_TPOINT to
TPARG_FL_TEVENT because this flag is used for eprobe (trace-event probe).
And reuse TPARG_FL_TPOINT for this raw tracepoint probe.
Link: https://lore.kernel.org/all/168507471874.913472.17214624519622959593.stgit@mhiramat.roam.corp.google.com/
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202305020453.afTJ3VVp-lkp@intel.com/
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 755b0bf2e1ac..fa4e1a18da70 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -5681,6 +5681,7 @@ static const char readme_msg[] = #endif #ifdef CONFIG_FPROBE_EVENTS "\t f[:[<group>/][<event>]] <func-name>[%return] [<args>]\n" + "\t t[:[<group>/][<event>]] <tracepoint> [<args>]\n" #endif #ifdef CONFIG_HIST_TRIGGERS "\t s:[synthetic/]<event> <field> [<field>]\n" |