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authorMathieu Desnoyers <mathieu.desnoyers@efficios.com>2014-04-08 17:26:21 -0400
committerSteven Rostedt <rostedt@goodmis.org>2014-04-08 20:43:28 -0400
commitde7b2973903c6cc50b31ee5682a69b2219b9919d (patch)
treea5b9d78102854b0073f5893cafb29920f8fb55e1 /include/trace
parent68114e5eb862ad0a7a261b91497281b026102715 (diff)
downloadop-kernel-dev-de7b2973903c6cc50b31ee5682a69b2219b9919d.zip
op-kernel-dev-de7b2973903c6cc50b31ee5682a69b2219b9919d.tar.gz
tracepoint: Use struct pointer instead of name hash for reg/unreg tracepoints
Register/unregister tracepoint probes with struct tracepoint pointer rather than tracepoint name. This change, which vastly simplifies tracepoint.c, has been proposed by Steven Rostedt. It also removes 8.8kB (mostly of text) to the vmlinux size. From this point on, the tracers need to pass a struct tracepoint pointer to probe register/unregister. A probe can now only be connected to a tracepoint that exists. Moreover, tracers are responsible for unregistering the probe before the module containing its associated tracepoint is unloaded. text data bss dec hex filename 10443444 4282528 10391552 25117524 17f4354 vmlinux.orig 10434930 4282848 10391552 25109330 17f2352 vmlinux Link: http://lkml.kernel.org/r/1396992381-23785-2-git-send-email-mathieu.desnoyers@efficios.com CC: Ingo Molnar <mingo@kernel.org> CC: Frederic Weisbecker <fweisbec@gmail.com> CC: Andrew Morton <akpm@linux-foundation.org> CC: Frank Ch. Eigler <fche@redhat.com> CC: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> [ SDR - fixed return val in void func in tracepoint_module_going() ] Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/ftrace.h9
1 files changed, 6 insertions, 3 deletions
diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
index 8765126..9c44c11 100644
--- a/include/trace/ftrace.h
+++ b/include/trace/ftrace.h
@@ -470,10 +470,11 @@ static inline notrace int ftrace_get_offsets_##call( \
* };
*
* static struct ftrace_event_call event_<call> = {
- * .name = "<call>",
+ * .tp = &__tracepoint_<call>,
* .class = event_class_<template>,
* .event = &ftrace_event_type_<call>,
* .print_fmt = print_fmt_<call>,
+ * .flags = TRACE_EVENT_FL_TRACEPOINT,
* };
* // its only safe to use pointers when doing linker tricks to
* // create an array.
@@ -605,10 +606,11 @@ static struct ftrace_event_class __used __refdata event_class_##call = { \
#define DEFINE_EVENT(template, call, proto, args) \
\
static struct ftrace_event_call __used event_##call = { \
- .name = #call, \
+ .tp = &__tracepoint_##call, \
.class = &event_class_##template, \
.event.funcs = &ftrace_event_type_funcs_##template, \
.print_fmt = print_fmt_##template, \
+ .flags = TRACE_EVENT_FL_TRACEPOINT, \
}; \
static struct ftrace_event_call __used \
__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
@@ -619,10 +621,11 @@ __attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
static const char print_fmt_##call[] = print; \
\
static struct ftrace_event_call __used event_##call = { \
- .name = #call, \
+ .tp = &__tracepoint_##call, \
.class = &event_class_##template, \
.event.funcs = &ftrace_event_type_funcs_##call, \
.print_fmt = print_fmt_##call, \
+ .flags = TRACE_EVENT_FL_TRACEPOINT, \
}; \
static struct ftrace_event_call __used \
__attribute__((section("_ftrace_events"))) *__event_##call = &event_##call
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