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tracing: Move a printk out of ftrace_raw_reg_event_foo()

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Move the printk from each ftrace_raw_reg_event_foo() to
its caller ftrace_event_enable_disable(). This avoids each
regfunc trace event callbacks to handle a same error report
that can be carried from the caller.

See how much space this saves:

   text    data     bss     dec     hex filename
5345151 1961864 7103260 14410275         dbe223 vmlinux.o.old
5331487 1961864 7103260 14396611         dbacc3 vmlinux.o

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Jason Baron <jbaron@redhat.com>
LKML-Reference: <4B1DC4AC.802@cn.fujitsu.com>
[start cmdline record before calling regfunc to avoid lost
window of pid to comm resolution]
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Li Zefan 2009-12-08 11:14:52 +08:00 committed by Frederic Weisbecker
parent 614a71a26b
commit 3b8e427381
3 changed files with 19 additions and 27 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
include/trace/ftrace.h
View file

@ -555,13 +555,7 @@ static void ftrace_profile_disable_##name(struct ftrace_event_call *unused)\
*
* static int ftrace_reg_event_<call>(struct ftrace_event_call *unused)
* {
* int ret;
*
* ret = register_trace_<call>(ftrace_event_<call>);
* if (!ret)
* pr_info("event trace: Could not activate trace point "
* "probe to <call>");
* return ret;
* return register_trace_<call>(ftrace_event_<call>);
* }
*
* static void ftrace_unreg_event_<call>(struct ftrace_event_call *unused)
@ -710,13 +704,7 @@ static void ftrace_raw_event_##call(proto) \
\
static int ftrace_raw_reg_event_##call(struct ftrace_event_call *unused)\
{ \
int ret; \
\
ret = register_trace_##call(ftrace_raw_event_##call); \
if (ret) \
pr_info("event trace: Could not activate trace point " \
"probe to %s\n", #call); \
return ret; \
return register_trace_##call(ftrace_raw_event_##call); \
} \
\
static void ftrace_raw_unreg_event_##call(struct ftrace_event_call *unused)\

20
kernel/trace/trace_events.c
View file

@ -118,9 +118,11 @@ int trace_event_raw_init(struct ftrace_event_call *call)
}
EXPORT_SYMBOL_GPL(trace_event_raw_init);
static void ftrace_event_enable_disable(struct ftrace_event_call *call,
static int ftrace_event_enable_disable(struct ftrace_event_call *call,
int enable)
{
int ret = 0;
switch (enable) {
case 0:
if (call->enabled) {
@ -131,12 +133,20 @@ static void ftrace_event_enable_disable(struct ftrace_event_call *call,
break;
case 1:
if (!call->enabled) {
call->enabled = 1;
tracing_start_cmdline_record();
call->regfunc(call);
ret = call->regfunc(call);
if (ret) {
tracing_stop_cmdline_record();
pr_info("event trace: Could not enable event "
"%s\n", call->name);
break;
}
call->enabled = 1;
}
break;
}
return ret;
}
static void ftrace_clear_events(void)
@ -415,7 +425,7 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
case 0:
case 1:
mutex_lock(&event_mutex);
ftrace_event_enable_disable(call, val);
ret = ftrace_event_enable_disable(call, val);
mutex_unlock(&event_mutex);
break;
@ -425,7 +435,7 @@ event_enable_write(struct file *filp, const char __user *ubuf, size_t cnt,
*ppos += cnt;
return cnt;
return ret ? ret : cnt;
}
static ssize_t

10
kernel/trace/trace_syscalls.c
View file

@ -325,10 +325,7 @@ int reg_event_syscall_enter(struct ftrace_event_call *call)
mutex_lock(&syscall_trace_lock);
if (!sys_refcount_enter)
ret = register_trace_sys_enter(ftrace_syscall_enter);
if (ret) {
pr_info("event trace: Could not activate"
"syscall entry trace point");
} else {
if (!ret) {
set_bit(num, enabled_enter_syscalls);
sys_refcount_enter++;
}
@ -362,10 +359,7 @@ int reg_event_syscall_exit(struct ftrace_event_call *call)
mutex_lock(&syscall_trace_lock);
if (!sys_refcount_exit)
ret = register_trace_sys_exit(ftrace_syscall_exit);
if (ret) {
pr_info("event trace: Could not activate"
"syscall exit trace point");
} else {
if (!ret) {
set_bit(num, enabled_exit_syscalls);
sys_refcount_exit++;
}