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tracing: Remove duplicate id information in event structure 

Now that the trace_event structure is embedded in the ftrace_event_call
structure, there is no need for the ftrace_event_call id field.
The id field is the same as the trace_event type field.

Removing the id and re-arranging the structure brings down the tracepoint
footprint by another 5K.

   text	   data	    bss	    dec	    hex	filename
4913961	1088356	 861512	6863829	 68bbd5	vmlinux.orig
4895024	1023812	 861512	6780348	 6775bc	vmlinux.print
4894944	1018052	 861512	6774508	 675eec	vmlinux.id

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>
This commit is contained in:
Steven Rostedt 2010-04-23 10:38:03 -04:00 committed by Steven Rostedt
parent 80decc70af
commit 32c0edaeaa
8 changed files with 34 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/ftrace_event.h
View File

@ -149,14 +149,13 @@ struct ftrace_event_call {
char *name;
struct dentry *dir;
struct trace_event event;
int enabled;
int id;
const char *print_fmt;
int filter_active;
struct event_filter *filter;
void *mod;
void *data;
int enabled;
int filter_active;
int perf_refcount;
};

12
include/trace/ftrace.h
View File

@ -150,7 +150,7 @@
*
* entry = iter->ent;
*
* if (entry->type != event_<call>.id) {
* if (entry->type != event_<call>->event.type) {
* WARN_ON_ONCE(1);
* return TRACE_TYPE_UNHANDLED;
* }
@ -221,7 +221,7 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
\
entry = iter->ent; \
\
if (entry->type != event->id) { \
if (entry->type != event->event.type) { \
WARN_ON_ONCE(1); \
return TRACE_TYPE_UNHANDLED; \
} \
@ -257,7 +257,7 @@ ftrace_raw_output_##call(struct trace_iterator *iter, int flags, \
\
entry = iter->ent; \
\
if (entry->type != event_##call.id) { \
if (entry->type != event_##call.event.type) { \
WARN_ON_ONCE(1); \
return TRACE_TYPE_UNHANDLED; \
} \
@ -409,7 +409,7 @@ static inline notrace int ftrace_get_offsets_##call( \
* __data_size = ftrace_get_offsets_<call>(&__data_offsets, args);
*
* event = trace_current_buffer_lock_reserve(&buffer,
* event_<call>.id,
* event_<call>->event.type,
* sizeof(*entry) + __data_size,
* irq_flags, pc);
* if (!event)
@ -510,7 +510,7 @@ ftrace_raw_event_##call(void *__data, proto) \
__data_size = ftrace_get_offsets_##call(&__data_offsets, args); \
\
event = trace_current_buffer_lock_reserve(&buffer, \
event_call->id, \
event_call->event.type, \
sizeof(*entry) + __data_size, \
irq_flags, pc); \
if (!event) \
@ -711,7 +711,7 @@ perf_trace_##call(void *__data, proto) \
"profile buffer not large enough")) \
return; \
entry = (struct ftrace_raw_##call *)perf_trace_buf_prepare( \
__entry_size, event_call->id, &rctx, &irq_flags); \
__entry_size, event_call->event.type, &rctx, &irq_flags); \
if (!entry) \
return; \
tstruct \

4
kernel/trace/trace_event_perf.c
View File

@ -80,7 +80,7 @@ int perf_trace_enable(int event_id)
mutex_lock(&event_mutex);
list_for_each_entry(event, &ftrace_events, list) {
if (event->id == event_id &&
if (event->event.type == event_id &&
event->class && event->class->perf_probe &&
try_module_get(event->mod)) {
ret = perf_trace_event_enable(event);
@ -128,7 +128,7 @@ void perf_trace_disable(int event_id)
mutex_lock(&event_mutex);
list_for_each_entry(event, &ftrace_events, list) {
if (event->id == event_id) {
if (event->event.type == event_id) {
perf_trace_event_disable(event);
module_put(event->mod);
break;

7
kernel/trace/trace_events.c
View File

@ -125,7 +125,6 @@ int trace_event_raw_init(struct ftrace_event_call *call)
id = register_ftrace_event(&call->event);
if (!id)
return -ENODEV;
call->id = id;
return 0;
}
@ -567,7 +566,7 @@ event_format_read(struct file *filp, char __user *ubuf, size_t cnt,
trace_seq_init(s);
trace_seq_printf(s, "name: %s\n", call->name);
trace_seq_printf(s, "ID: %d\n", call->id);
trace_seq_printf(s, "ID: %d\n", call->event.type);
trace_seq_printf(s, "format:\n");
head = trace_get_fields(call);
@ -641,7 +640,7 @@ event_id_read(struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos)
return -ENOMEM;
trace_seq_init(s);
trace_seq_printf(s, "%d\n", call->id);
trace_seq_printf(s, "%d\n", call->event.type);
r = simple_read_from_buffer(ubuf, cnt, ppos,
s->buffer, s->len);
@ -969,7 +968,7 @@ event_create_dir(struct ftrace_event_call *call, struct dentry *d_events,
enable);
#ifdef CONFIG_PERF_EVENTS
if (call->id && (call->class->perf_probe || call->class->reg))
if (call->event.type && (call->class->perf_probe || call->class->reg))
trace_create_file("id", 0444, call->dir, call,
id);
#endif

2
kernel/trace/trace_events_filter.c
View File

@ -1395,7 +1395,7 @@ int ftrace_profile_set_filter(struct perf_event *event, int event_id,
mutex_lock(&event_mutex);
list_for_each_entry(call, &ftrace_events, list) {
if (call->id == event_id)
if (call->event.type == event_id)
break;
}

4
kernel/trace/trace_export.c
View File

@ -153,7 +153,7 @@ static int ftrace_raw_init_event(struct ftrace_event_call *call)
#define F_printk(fmt, args...) #fmt ", " __stringify(args)
#undef FTRACE_ENTRY
#define FTRACE_ENTRY(call, struct_name, type, tstruct, print) \
#define FTRACE_ENTRY(call, struct_name, etype, tstruct, print) \
\
struct ftrace_event_class event_class_ftrace_##call = { \
.system = __stringify(TRACE_SYSTEM), \
@ -165,7 +165,7 @@ struct ftrace_event_call __used \
__attribute__((__aligned__(4))) \
__attribute__((section("_ftrace_events"))) event_##call = { \
.name = #call, \
.id = type, \
.event.type = etype, \
.class = &event_class_ftrace_##call, \
.print_fmt = print, \
}; \

18
kernel/trace/trace_kprobe.c
View File

@ -960,8 +960,8 @@ static __kprobes void kprobe_trace_func(struct kprobe *kp, struct pt_regs *regs)
size = SIZEOF_KPROBE_TRACE_ENTRY(tp->nr_args);
event = trace_current_buffer_lock_reserve(&buffer, call->id, size,
irq_flags, pc);
event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
size, irq_flags, pc);
if (!event)
return;
@ -992,8 +992,8 @@ static __kprobes void kretprobe_trace_func(struct kretprobe_instance *ri,
size = SIZEOF_KRETPROBE_TRACE_ENTRY(tp->nr_args);
event = trace_current_buffer_lock_reserve(&buffer, call->id, size,
irq_flags, pc);
event = trace_current_buffer_lock_reserve(&buffer, call->event.type,
size, irq_flags, pc);
if (!event)
return;
@ -1228,7 +1228,8 @@ static __kprobes void kprobe_perf_func(struct kprobe *kp,
"profile buffer not large enough"))
return;
entry = perf_trace_buf_prepare(size, call->id, &rctx, &irq_flags);
entry = perf_trace_buf_prepare(size, call->event.type,
&rctx, &irq_flags);
if (!entry)
return;
@ -1258,7 +1259,8 @@ static __kprobes void kretprobe_perf_func(struct kretprobe_instance *ri,
"profile buffer not large enough"))
return;
entry = perf_trace_buf_prepare(size, call->id, &rctx, &irq_flags);
entry = perf_trace_buf_prepare(size, call->event.type,
&rctx, &irq_flags);
if (!entry)
return;
@ -1375,8 +1377,8 @@ static int register_probe_event(struct trace_probe *tp)
}
if (set_print_fmt(tp) < 0)
return -ENOMEM;
call->id = register_ftrace_event(&call->event);
if (!call->id) {
ret = register_ftrace_event(&call->event);
if (!ret) {
kfree(call->print_fmt);
return -ENODEV;
}

14
kernel/trace/trace_syscalls.c
View File

@ -117,7 +117,7 @@ print_syscall_enter(struct trace_iterator *iter, int flags,
if (!entry)
goto end;
if (entry->enter_event->id != ent->type) {
if (entry->enter_event->event.type != ent->type) {
WARN_ON_ONCE(1);
goto end;
}
@ -173,7 +173,7 @@ print_syscall_exit(struct trace_iterator *iter, int flags,
return TRACE_TYPE_HANDLED;
}
if (entry->exit_event->id != ent->type) {
if (entry->exit_event->event.type != ent->type) {
WARN_ON_ONCE(1);
return TRACE_TYPE_UNHANDLED;
}
@ -315,7 +315,7 @@ void ftrace_syscall_enter(void *ignore, struct pt_regs *regs, long id)
size = sizeof(*entry) + sizeof(unsigned long) * sys_data->nb_args;
event = trace_current_buffer_lock_reserve(&buffer,
sys_data->enter_event->id, size, 0, 0);
sys_data->enter_event->event.type, size, 0, 0);
if (!event)
return;
@ -347,7 +347,7 @@ void ftrace_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
return;
event = trace_current_buffer_lock_reserve(&buffer,
sys_data->exit_event->id, sizeof(*entry), 0, 0);
sys_data->exit_event->event.type, sizeof(*entry), 0, 0);
if (!event)
return;
@ -511,7 +511,8 @@ static void perf_syscall_enter(void *ignore, struct pt_regs *regs, long id)
return;
rec = (struct syscall_trace_enter *)perf_trace_buf_prepare(size,
sys_data->enter_event->id, &rctx, &flags);
sys_data->enter_event->event.type,
&rctx, &flags);
if (!rec)
return;
@ -586,7 +587,8 @@ static void perf_syscall_exit(void *ignore, struct pt_regs *regs, long ret)
return;
rec = (struct syscall_trace_exit *)perf_trace_buf_prepare(size,
sys_data->exit_event->id, &rctx, &flags);
sys_data->exit_event->event.type,
&rctx, &flags);
if (!rec)
return;