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Date: Wed, 28 Apr 2010 17:03:55 -0400
From: Mathieu Desnoyers <compudj@...stal.dyndns.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
Andrew Morton <akpm@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
Frederic Weisbecker <fweisbec@...il.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>,
Lai Jiangshan <laijs@...fujitsu.com>,
Li Zefan <lizf@...fujitsu.com>,
Masami Hiramatsu <mhiramat@...hat.com>,
Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 08/10][RFC] tracing: Move print functions into event
class
* Steven Rostedt (rostedt@...dmis.org) wrote:
> From: Steven Rostedt <srostedt@...hat.com>
>
> 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 37K.
>
> text data bss dec hex filename
> 5788186 1337252 9351592 16477030 fb6b66 vmlinux.orig
> 5774574 1293204 9351592 16419370 fa8a2a vmlinux.init
> 5761154 1268356 9351592 16381102 f9f4ae 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.
>
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
> ---
> include/linux/ftrace_event.h | 2 +-
> include/linux/syscalls.h | 18 +++------------
> include/trace/ftrace.h | 47 +++++++++++++++++-----------------------
> kernel/trace/trace_events.c | 6 ++--
> kernel/trace/trace_kprobe.c | 14 +++++-------
> kernel/trace/trace_syscalls.c | 8 +++++++
> 6 files changed, 42 insertions(+), 53 deletions(-)
>
> diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h
> index 09c2ad7..aa3695a 100644
> --- a/include/linux/ftrace_event.h
> +++ b/include/linux/ftrace_event.h
> @@ -146,7 +146,7 @@ struct ftrace_event_call {
> struct ftrace_event_class *class;
> char *name;
> struct dentry *dir;
> - struct trace_event *event;
> + struct trace_event event;
> int enabled;
> int id;
> const char *print_fmt;
> diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
> index f3892e9..5d060b7 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,\
> }
>
> diff --git a/include/trace/ftrace.h b/include/trace/ftrace.h
> index 2efb301..d7b3b56 100644
> --- a/include/trace/ftrace.h
> +++ b/include/trace/ftrace.h
> @@ -206,18 +206,22 @@
> #undef DECLARE_EVENT_CLASS
> #define DECLARE_EVENT_CLASS(call, proto, args, tstruct, assign, print) \
> static notrace enum print_line_t \
> -ftrace_raw_output_id_##call(int event_id, const char *name, \
> - struct trace_iterator *iter, int flags) \
> +ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
> + struct trace_event *trace_event) \
> { \
> + struct ftrace_event_call *event; \
> struct trace_seq *s = &iter->seq; \
> struct ftrace_raw_##call *field; \
> struct trace_entry *entry; \
> struct trace_seq *p; \
> int ret; \
> \
> + event = container_of(trace_event, struct ftrace_event_call, \
> + event); \
> + \
> entry = iter->ent; \
> \
> - if (entry->type != event_id) { \
> + if (entry->type != event->id) { \
> WARN_ON_ONCE(1); \
> return TRACE_TYPE_UNHANDLED; \
> } \
> @@ -226,7 +230,7 @@ ftrace_raw_output_id_##call(int event_id, const char *name, \
> \
> p = &get_cpu_var(ftrace_event_seq); \
> trace_seq_init(p); \
> - ret = trace_seq_printf(s, "%s: ", name); \
> + ret = trace_seq_printf(s, "%s: ", event->name); \
> if (ret) \
> ret = trace_seq_printf(s, print); \
> put_cpu(); \
> @@ -234,17 +238,10 @@ ftrace_raw_output_id_##call(int event_id, const char *name, \
> return TRACE_TYPE_PARTIAL_LINE; \
> \
> return TRACE_TYPE_HANDLED; \
> -}
> -
> -#undef DEFINE_EVENT
> -#define DEFINE_EVENT(template, name, proto, args) \
> -static notrace enum print_line_t \
> -ftrace_raw_output_##name(struct trace_iterator *iter, int flags, \
> - struct trace_event *event) \
> -{ \
> - return ftrace_raw_output_id_##template(event_##name.id, \
> - #name, iter, flags); \
> -}
> +} \
> +static struct trace_event_functions ftrace_event_type_funcs_##call = { \
> + .trace = ftrace_raw_output_##call, \
> +};
>
> #undef DEFINE_EVENT_PRINT
> #define DEFINE_EVENT_PRINT(template, call, proto, args, print) \
> @@ -277,7 +274,10 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
> return TRACE_TYPE_PARTIAL_LINE; \
> \
> return TRACE_TYPE_HANDLED; \
> -}
> +} \
> +static struct trace_event_functions ftrace_event_type_funcs_##call = { \
> + .trace = ftrace_raw_output_##call, \
> +};
>
> #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
>
> @@ -526,17 +526,10 @@ ftrace_raw_event_##call(proto, \
> }
>
> #undef DEFINE_EVENT
> -#define DEFINE_EVENT(template, call, proto, args) \
> -static struct trace_event_functions ftrace_event_type_funcs_##call = { \
> - .trace = ftrace_raw_output_##call, \
> -}; \
> -static struct trace_event ftrace_event_type_##call = { \
> - .funcs = &ftrace_event_type_funcs_##call, \
> -};
> +#define DEFINE_EVENT(template, call, proto, args)
>
> #undef DEFINE_EVENT_PRINT
> -#define DEFINE_EVENT_PRINT(template, name, proto, args, print) \
> - DEFINE_EVENT(template, name, PARAMS(proto), PARAMS(args))
> +#define DEFINE_EVENT_PRINT(template, name, proto, args, print)
>
> #include TRACE_INCLUDE(TRACE_INCLUDE_FILE)
>
> @@ -572,7 +565,7 @@ __attribute__((__aligned__(4))) \
> __attribute__((section("_ftrace_events"))) event_##call = { \
> .name = #call, \
> .class = &event_class_##template, \
> - .event = &ftrace_event_type_##call, \
> + .event.funcs = &ftrace_event_type_funcs_##template, \
> .print_fmt = print_fmt_##template, \
> }
>
> @@ -586,7 +579,7 @@ __attribute__((__aligned__(4))) \
> __attribute__((section("_ftrace_events"))) event_##call = { \
> .name = #call, \
> .class = &event_class_##template, \
> - .event = &ftrace_event_type_##call, \
> + .event.funcs = &ftrace_event_type_funcs_##call, \
> .print_fmt = print_fmt_##call, \
> }
>
> diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
> index c34a9bd..9aa298e 100644
> --- a/kernel/trace/trace_events.c
> +++ b/kernel/trace/trace_events.c
> @@ -129,7 +129,7 @@ int trace_event_raw_init(struct ftrace_event_call *call)
> {
> int id;
>
> - id = register_ftrace_event(call->event);
> + id = register_ftrace_event(&call->event);
> if (!id)
> return -ENODEV;
> call->id = id;
> @@ -1077,8 +1077,8 @@ static void remove_subsystem_dir(const char *name)
> static void __trace_remove_event_call(struct ftrace_event_call *call)
> {
> ftrace_event_enable_disable(call, 0);
> - if (call->event)
> - __unregister_ftrace_event(call->event);
> + if (call->event.funcs)
> + __unregister_ftrace_event(&call->event);
> debugfs_remove_recursive(call->dir);
> list_del(&call->list);
> trace_destroy_fields(call);
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index b989ae2..d8061c3 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -204,7 +204,6 @@ struct trace_probe {
> const char *symbol; /* symbol name */
> struct ftrace_event_class class;
> struct ftrace_event_call call;
> - struct trace_event event;
> unsigned int nr_args;
> struct probe_arg args[];
> };
> @@ -1020,7 +1019,7 @@ print_kprobe_event(struct trace_iterator *iter, int flags,
> int i;
>
> field = (struct kprobe_trace_entry *)iter->ent;
> - tp = container_of(event, struct trace_probe, event);
> + tp = container_of(event, struct trace_probe, call.event);
>
> if (!trace_seq_printf(s, "%s: (", tp->call.name))
> goto partial;
> @@ -1054,7 +1053,7 @@ print_kretprobe_event(struct trace_iterator *iter, int flags,
> int i;
>
> field = (struct kretprobe_trace_entry *)iter->ent;
> - tp = container_of(event, struct trace_probe, event);
> + tp = container_of(event, struct trace_probe, call.event);
>
> if (!trace_seq_printf(s, "%s: (", tp->call.name))
> goto partial;
> @@ -1364,20 +1363,19 @@ static int register_probe_event(struct trace_probe *tp)
>
> /* Initialize ftrace_event_call */
> if (probe_is_return(tp)) {
> - tp->event.funcs = &kretprobe_funcs;
> INIT_LIST_HEAD(&call->class->fields);
> + call->event.funcs = &kretprobe_funcs;
> call->class->raw_init = probe_event_raw_init;
> call->class->define_fields = kretprobe_event_define_fields;
> } else {
> INIT_LIST_HEAD(&call->class->fields);
> - tp->event.funcs = &kprobe_funcs;
> + call->event.funcs = &kprobe_funcs;
> call->class->raw_init = probe_event_raw_init;
> call->class->define_fields = kprobe_event_define_fields;
> }
> if (set_print_fmt(tp) < 0)
> return -ENOMEM;
> - call->event = &tp->event;
> - call->id = register_ftrace_event(&tp->event);
> + call->id = register_ftrace_event(&call->event);
> if (!call->id) {
> kfree(call->print_fmt);
> return -ENODEV;
> @@ -1389,7 +1387,7 @@ static int register_probe_event(struct trace_probe *tp)
> if (ret) {
> pr_info("Failed to register kprobe event: %s\n", call->name);
> kfree(call->print_fmt);
> - unregister_ftrace_event(&tp->event);
> + unregister_ftrace_event(&call->event);
> }
> return ret;
> }
> diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
> index 0bcca08..a4bed39 100644
> --- a/kernel/trace/trace_syscalls.c
> +++ b/kernel/trace/trace_syscalls.c
> @@ -30,6 +30,14 @@ syscall_get_fields(struct ftrace_event_call *call)
> return &entry->fields;
> }
>
> +struct trace_event_functions enter_syscall_print_funcs = {
> + .trace = print_syscall_enter,
> +};
> +
> +struct trace_event_functions exit_syscall_print_funcs = {
> + .trace = print_syscall_exit,
> +};
> +
> struct ftrace_event_class event_class_syscall_enter = {
> .system = "syscalls",
> .reg = syscall_enter_register,
> --
> 1.7.0
>
>
--
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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