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authorSteven Rostedt2010-04-23 16:00:22 +0200
committerSteven Rostedt2010-05-14 20:20:34 +0200
commit80decc70afc57c87eee9d6b836aec2ecacba3457 (patch)
tree3aec4c67a5518a9c4e60a6914c5dbb9eb82e952f /include/linux/syscalls.h
parenttracing: Allow events to share their print functions (diff)
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tracing: Move print functions into event class
Currently, every event has its own trace_event structure. This is fine since the structure is needed anyway. But the print function structure (trace_event_functions) is now separate. Since the output of the trace event is done by the class (with the exception of events defined by DEFINE_EVENT_PRINT), it makes sense to have the class define the print functions that all events in the class can use. This makes a bigger deal with the syscall events since all syscall events use the same class. The savings here is another 30K. text data bss dec hex filename 4913961 1088356 861512 6863829 68bbd5 vmlinux.orig 4900382 1048964 861512 6810858 67ecea vmlinux.init 4900446 1049028 861512 6810986 67ed6a vmlinux.preprint 4895024 1023812 861512 6780348 6775bc vmlinux.print To accomplish this, and to let the class know what event is being printed, the event structure is embedded in the ftrace_event_call structure. This should not be an issues since the event structure was created for each event anyway. Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Acked-by: Masami Hiramatsu <mhiramat@redhat.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/syscalls.h')
-rw-r--r--include/linux/syscalls.h18
1 files changed, 4 insertions, 14 deletions
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index f7256770a20f..a1a86a53bc73 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -120,24 +120,20 @@ struct perf_event_attr;
extern struct ftrace_event_class event_class_syscall_enter;
extern struct ftrace_event_class event_class_syscall_exit;
+extern struct trace_event_functions enter_syscall_print_funcs;
+extern struct trace_event_functions exit_syscall_print_funcs;
#define SYSCALL_TRACE_ENTER_EVENT(sname) \
static struct syscall_metadata __syscall_meta_##sname; \
static struct ftrace_event_call \
__attribute__((__aligned__(4))) event_enter_##sname; \
- static struct trace_event_functions enter_syscall_print_funcs_##sname = { \
- .trace = print_syscall_enter, \
- }; \
- static struct trace_event enter_syscall_print_##sname = { \
- .funcs = &enter_syscall_print_funcs_##sname, \
- }; \
static struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_events"))) \
event_enter_##sname = { \
.name = "sys_enter"#sname, \
.class = &event_class_syscall_enter, \
- .event = &enter_syscall_print_##sname, \
+ .event.funcs = &enter_syscall_print_funcs, \
.data = (void *)&__syscall_meta_##sname,\
}
@@ -145,19 +141,13 @@ extern struct ftrace_event_class event_class_syscall_exit;
static struct syscall_metadata __syscall_meta_##sname; \
static struct ftrace_event_call \
__attribute__((__aligned__(4))) event_exit_##sname; \
- static struct trace_event_functions exit_syscall_print_funcs_##sname = { \
- .trace = print_syscall_exit, \
- }; \
- static struct trace_event exit_syscall_print_##sname = { \
- .funcs = &exit_syscall_print_funcs_##sname, \
- }; \
static struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_events"))) \
event_exit_##sname = { \
.name = "sys_exit"#sname, \
.class = &event_class_syscall_exit, \
- .event = &exit_syscall_print_##sname, \
+ .event.funcs = &exit_syscall_print_funcs, \
.data = (void *)&__syscall_meta_##sname,\
}