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ftrace: combine stack trace in function call 

Impact: less likely to interleave function and stack traces

This patch does replaces the separate stack trace on function with
a record function and stack trace together. This will switch between
the function only recording to a function and stack recording.

Also some whitespace fix ups as well.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt 2009-01-15 22:21:43 -05:00 committed by Ingo Molnar
parent 5e4abc9839
commit 3eb36aa053
1 changed files with 36 additions and 25 deletions
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61
kernel/trace/trace_functions.c
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@ -133,6 +133,7 @@ function_stack_trace_call(unsigned long ip, unsigned long parent_ip)
if (likely(disabled == 1)) {
pc = preempt_count();
trace_function(tr, data, ip, parent_ip, flags, pc);
/*
* skip over 5 funcs:
* __ftrace_trace_stack,
@ -154,24 +155,6 @@ static struct ftrace_ops trace_ops __read_mostly =
.func = function_trace_call,
};
void tracing_start_function_trace(void)
{
ftrace_function_enabled = 0;
if (trace_flags & TRACE_ITER_PREEMPTONLY)
trace_ops.func = function_trace_call_preempt_only;
else
trace_ops.func = function_trace_call;
register_ftrace_function(&trace_ops);
ftrace_function_enabled = 1;
}
void tracing_stop_function_trace(void)
{
ftrace_function_enabled = 0;
unregister_ftrace_function(&trace_ops);
}
static struct ftrace_ops trace_stack_ops __read_mostly =
{
.func = function_stack_trace_call,
@ -194,6 +177,31 @@ static struct tracer_flags func_flags = {
.opts = func_opts
};
void tracing_start_function_trace(void)
{
ftrace_function_enabled = 0;
if (trace_flags & TRACE_ITER_PREEMPTONLY)
trace_ops.func = function_trace_call_preempt_only;
else
trace_ops.func = function_trace_call;
if (func_flags.val & TRACE_FUNC_OPT_STACK)
register_ftrace_function(&trace_stack_ops);
else
register_ftrace_function(&trace_ops);
ftrace_function_enabled = 1;
}
void tracing_stop_function_trace(void)
{
ftrace_function_enabled = 0;
/* OK if they are not registered */
unregister_ftrace_function(&trace_stack_ops);
unregister_ftrace_function(&trace_ops);
}
static int func_set_flag(u32 old_flags, u32 bit, int set)
{
if (bit == TRACE_FUNC_OPT_STACK) {
@ -201,10 +209,13 @@ static int func_set_flag(u32 old_flags, u32 bit, int set)
if (!!set == !!(func_flags.val & TRACE_FUNC_OPT_STACK))
return 0;
if (set)
if (set) {
unregister_ftrace_function(&trace_ops);
register_ftrace_function(&trace_stack_ops);
else
} else {
unregister_ftrace_function(&trace_stack_ops);
register_ftrace_function(&trace_ops);
}
return 0;
}
@ -214,14 +225,14 @@ static int func_set_flag(u32 old_flags, u32 bit, int set)
static struct tracer function_trace __read_mostly =
{
.name = "function",
.init = function_trace_init,
.reset = function_trace_reset,
.start = function_trace_start,
.name = "function",
.init = function_trace_init,
.reset = function_trace_reset,
.start = function_trace_start,
.flags = &func_flags,
.set_flag = func_set_flag,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_function,
.selftest = trace_selftest_startup_function,
#endif
};