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authorMasami Hiramatsu <mhiramat@kernel.org>2018-11-05 18:03:33 +0900
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2018-12-08 20:54:10 -0500
commit7bbab38d07f3185fddf6fce126e2239010efdfce (patch)
tree8297c02ef9266cda5ea1c53b6c702936a52eb402 /kernel/trace/trace.c
parent0597c49c69d53f00df99421d832453f4e92a5006 (diff)
tracing: Use dyn_event framework for synthetic events
Use dyn_event framework for synthetic events. This shows synthetic events on "tracing/dynamic_events" file in addition to tracing/synthetic_events interface. User can also define new events via tracing/dynamic_events with "s:" prefix. So, the new syntax is below; s:[synthetic/]EVENT_NAME TYPE ARG; [TYPE ARG;]... To remove events via tracing/dynamic_events, you can use "-:" prefix as same as other events. Link: http://lkml.kernel.org/r/154140861301.17322.15454611233735614508.stgit@devbox Reviewed-by: Tom Zanussi <tom.zanussi@linux.intel.com> Tested-by: Tom Zanussi <tom.zanussi@linux.intel.com> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.c')
-rw-r--r--kernel/trace/trace.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 7e0332f90ed4..911470ad9e94 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -4620,6 +4620,9 @@ static const char readme_msg[] =
"\t accepts: event-definitions (one definition per line)\n"
"\t Format: p[:[<group>/]<event>] <place> [<args>]\n"
"\t r[maxactive][:[<group>/]<event>] <place> [<args>]\n"
+#ifdef CONFIG_HIST_TRIGGERS
+ "\t s:[synthetic/]<event> <field> [<field>]\n"
+#endif
"\t -:[<group>/]<event>\n"
#ifdef CONFIG_KPROBE_EVENTS
"\t place: [<module>:]<symbol>[+<offset>]|<memaddr>\n"
@@ -4638,6 +4641,11 @@ static const char readme_msg[] =
"\t type: s8/16/32/64, u8/16/32/64, x8/16/32/64, string, symbol,\n"
"\t b<bit-width>@<bit-offset>/<container-size>,\n"
"\t <type>\\[<array-size>\\]\n"
+#ifdef CONFIG_HIST_TRIGGERS
+ "\t field: <stype> <name>;\n"
+ "\t stype: u8/u16/u32/u64, s8/s16/s32/s64, pid_t,\n"
+ "\t [unsigned] char/int/long\n"
+#endif
#endif
" events/\t\t- Directory containing all trace event subsystems:\n"
" enable\t\t- Write 0/1 to enable/disable tracing of all events\n"