diff options
| author | Masami Hiramatsu <mhiramat@kernel.org> | 2019-06-20 00:07:49 +0900 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-08-31 12:19:38 -0400 |
| commit | ca89bc071d5e4e981dcc52e0ca90f4500d332e42 (patch) | |
| tree | a54787d9b315c337d1a7d5740db43e6a503c65ab /kernel/trace/trace_probe.h | |
| parent | 30199137c899d7e416a2adc58bf09bec217ce9ca (diff) | |
tracing/kprobe: Add multi-probe per event support
Add multi-probe per one event support to kprobe events.
User can define several different probes on one trace event
if those events have same "event signature",
e.g.
# echo p:testevent _do_fork > kprobe_events
# echo p:testevent fork_idle >> kprobe_events
# kprobe_events
p:kprobes/testevent _do_fork
p:kprobes/testevent fork_idle
The event signature is defined by kprobe type (retprobe or not),
the number of args, argument names, and argument types.
Note that this only support appending method. Delete event
operation will delete all probes on the event.
Link: http://lkml.kernel.org/r/156095686913.28024.9357292202316540742.stgit@devnote2
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace_probe.h')
| -rw-r--r-- | kernel/trace/trace_probe.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h index 0b84abb884c2..39926e8a344b 100644 --- a/kernel/trace/trace_probe.h +++ b/kernel/trace/trace_probe.h @@ -302,6 +302,13 @@ static inline struct list_head *trace_probe_probe_list(struct trace_probe *tp) return &tp->event->probes; } +static inline bool trace_probe_has_sibling(struct trace_probe *tp) +{ + struct list_head *list = trace_probe_probe_list(tp); + + return !list_empty(list) && !list_is_singular(list); +} + static inline int trace_probe_unregister_event_call(struct trace_probe *tp) { /* tp->event is unregistered in trace_remove_event_call() */ @@ -316,12 +323,15 @@ static inline bool trace_probe_has_single_file(struct trace_probe *tp) int trace_probe_init(struct trace_probe *tp, const char *event, const char *group); void trace_probe_cleanup(struct trace_probe *tp); +int trace_probe_append(struct trace_probe *tp, struct trace_probe *to); +void trace_probe_unlink(struct trace_probe *tp); int trace_probe_register_event_call(struct trace_probe *tp); int trace_probe_add_file(struct trace_probe *tp, struct trace_event_file *file); int trace_probe_remove_file(struct trace_probe *tp, struct trace_event_file *file); struct event_file_link *trace_probe_get_file_link(struct trace_probe *tp, struct trace_event_file *file); +int trace_probe_compare_arg_type(struct trace_probe *a, struct trace_probe *b); #define trace_probe_for_each_link(pos, tp) \ list_for_each_entry(pos, &(tp)->event->files, list) @@ -419,7 +429,9 @@ extern int traceprobe_define_arg_fields(struct trace_event_call *event_call, C(ARG_TOO_LONG, "Argument expression is too long"), \ C(NO_ARG_BODY, "No argument expression"), \ C(BAD_INSN_BNDRY, "Probe point is not an instruction boundary"),\ - C(FAIL_REG_PROBE, "Failed to register probe event"), + C(FAIL_REG_PROBE, "Failed to register probe event"),\ + C(DIFF_PROBE_TYPE, "Probe type is different from existing probe"),\ + C(DIFF_ARG_TYPE, "Argument type or name is different from existing probe"), #undef C #define C(a, b) TP_ERR_##a |