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authorMasami Hiramatsu (Google) <mhiramat@kernel.org>2023-06-06 14:39:55 +0200
committerMasami Hiramatsu (Google) <mhiramat@kernel.org>2023-06-06 14:39:55 +0200
commite2d0d7b2f42dcaf924e9c891c91c9aa22cbbebce (patch)
treec5102fa52e82681e7963a061813c880c34edb87b /kernel/trace/trace.c
parentselftests/ftrace: Add fprobe related testcases (diff)
downloadlinux-e2d0d7b2f42dcaf924e9c891c91c9aa22cbbebce.tar.xz
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.c1
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"