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ftrace: move function tracer functions out of trace.c

Browse source 
Impact: clean up of trace.c

The function tracer functions were put in trace.c because it needed
to share static variables that were in trace.c.  Since then, those
variables have become global for various reasons. This patch moves
the function tracer functions into trace_function.c where they belong.

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 20:40:23 -05:00 committed by Ingo Molnar
parent 5361499101
commit bb3c3c95f3
2 changed files with 83 additions and 85 deletions
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84
kernel/trace/trace.c
View file

@ -1046,65 +1046,6 @@ ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
local_irq_restore(flags);
}
#ifdef CONFIG_FUNCTION_TRACER
static void
function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
{
struct trace_array *tr = &global_trace;
struct trace_array_cpu *data;
unsigned long flags;
long disabled;
int cpu, resched;
int pc;
if (unlikely(!ftrace_function_enabled))
return;
pc = preempt_count();
resched = ftrace_preempt_disable();
local_save_flags(flags);
cpu = raw_smp_processor_id();
data = tr->data[cpu];
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1))
trace_function(tr, data, ip, parent_ip, flags, pc);
atomic_dec(&data->disabled);
ftrace_preempt_enable(resched);
}
static void
function_trace_call(unsigned long ip, unsigned long parent_ip)
{
struct trace_array *tr = &global_trace;
struct trace_array_cpu *data;
unsigned long flags;
long disabled;
int cpu;
int pc;
if (unlikely(!ftrace_function_enabled))
return;
/*
* Need to use raw, since this must be called before the
* recursive protection is performed.
*/
local_irq_save(flags);
cpu = raw_smp_processor_id();
data = tr->data[cpu];
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1)) {
pc = preempt_count();
trace_function(tr, data, ip, parent_ip, flags, pc);
}
atomic_dec(&data->disabled);
local_irq_restore(flags);
}
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
int trace_graph_entry(struct ftrace_graph_ent *trace)
{
@ -1162,31 +1103,6 @@ void trace_graph_return(struct ftrace_graph_ret *trace)
}
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
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);
}
#endif
enum trace_file_type {
TRACE_FILE_LAT_FMT = 1,
TRACE_FILE_ANNOTATE = 2,

84
kernel/trace/trace_functions.c
View file

@ -20,6 +20,7 @@ static struct trace_array *func_trace;
static void start_function_trace(struct trace_array *tr)
{
func_trace = tr;
tr->cpu = get_cpu();
tracing_reset_online_cpus(tr);
put_cpu();
@ -36,7 +37,6 @@ static void stop_function_trace(struct trace_array *tr)
static int function_trace_init(struct trace_array *tr)
{
func_trace = tr;
start_function_trace(tr);
return 0;
}
@ -51,6 +51,64 @@ static void function_trace_start(struct trace_array *tr)
tracing_reset_online_cpus(tr);
}
static void
function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
{
struct trace_array *tr = func_trace;
struct trace_array_cpu *data;
unsigned long flags;
long disabled;
int cpu, resched;
int pc;
if (unlikely(!ftrace_function_enabled))
return;
pc = preempt_count();
resched = ftrace_preempt_disable();
local_save_flags(flags);
cpu = raw_smp_processor_id();
data = tr->data[cpu];
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1))
trace_function(tr, data, ip, parent_ip, flags, pc);
atomic_dec(&data->disabled);
ftrace_preempt_enable(resched);
}
static void
function_trace_call(unsigned long ip, unsigned long parent_ip)
{
struct trace_array *tr = func_trace;
struct trace_array_cpu *data;
unsigned long flags;
long disabled;
int cpu;
int pc;
if (unlikely(!ftrace_function_enabled))
return;
/*
* Need to use raw, since this must be called before the
* recursive protection is performed.
*/
local_irq_save(flags);
cpu = raw_smp_processor_id();
data = tr->data[cpu];
disabled = atomic_inc_return(&data->disabled);
if (likely(disabled == 1)) {
pc = preempt_count();
trace_function(tr, data, ip, parent_ip, flags, pc);
}
atomic_dec(&data->disabled);
local_irq_restore(flags);
}
static void
function_stack_trace_call(unsigned long ip, unsigned long parent_ip)
{
@ -90,6 +148,30 @@ function_stack_trace_call(unsigned long ip, unsigned long parent_ip)
local_irq_restore(flags);
}
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,