Merge branch 'tip/perf/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into perf/core

This commit is contained in:
Ingo Molnar 2011-02-14 15:15:16 +01:00
Родитель 0de4b34d46 868baf07b1
Коммит bf1af3a809
3 изменённых файлов: 48 добавлений и 8 удалений

Просмотреть файл

@ -428,6 +428,7 @@ extern void unregister_ftrace_graph(void);
extern void ftrace_graph_init_task(struct task_struct *t); extern void ftrace_graph_init_task(struct task_struct *t);
extern void ftrace_graph_exit_task(struct task_struct *t); extern void ftrace_graph_exit_task(struct task_struct *t);
extern void ftrace_graph_init_idle_task(struct task_struct *t, int cpu);
static inline int task_curr_ret_stack(struct task_struct *t) static inline int task_curr_ret_stack(struct task_struct *t)
{ {
@ -451,6 +452,7 @@ static inline void unpause_graph_tracing(void)
static inline void ftrace_graph_init_task(struct task_struct *t) { } static inline void ftrace_graph_init_task(struct task_struct *t) { }
static inline void ftrace_graph_exit_task(struct task_struct *t) { } static inline void ftrace_graph_exit_task(struct task_struct *t) { }
static inline void ftrace_graph_init_idle_task(struct task_struct *t, int cpu) { }
static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc, static inline int register_ftrace_graph(trace_func_graph_ret_t retfunc,
trace_func_graph_ent_t entryfunc) trace_func_graph_ent_t entryfunc)

Просмотреть файл

@ -5550,7 +5550,7 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
* The idle tasks have their own, simple scheduling class: * The idle tasks have their own, simple scheduling class:
*/ */
idle->sched_class = &idle_sched_class; idle->sched_class = &idle_sched_class;
ftrace_graph_init_task(idle); ftrace_graph_init_idle_task(idle, cpu);
} }
/* /*

Просмотреть файл

@ -3328,7 +3328,7 @@ static int start_graph_tracing(void)
/* The cpu_boot init_task->ret_stack will never be freed */ /* The cpu_boot init_task->ret_stack will never be freed */
for_each_online_cpu(cpu) { for_each_online_cpu(cpu) {
if (!idle_task(cpu)->ret_stack) if (!idle_task(cpu)->ret_stack)
ftrace_graph_init_task(idle_task(cpu)); ftrace_graph_init_idle_task(idle_task(cpu), cpu);
} }
do { do {
@ -3418,6 +3418,49 @@ void unregister_ftrace_graph(void)
mutex_unlock(&ftrace_lock); mutex_unlock(&ftrace_lock);
} }
static DEFINE_PER_CPU(struct ftrace_ret_stack *, idle_ret_stack);
static void
graph_init_task(struct task_struct *t, struct ftrace_ret_stack *ret_stack)
{
atomic_set(&t->tracing_graph_pause, 0);
atomic_set(&t->trace_overrun, 0);
t->ftrace_timestamp = 0;
/* make curr_ret_stack visable before we add the ret_stack */
smp_wmb();
t->ret_stack = ret_stack;
}
/*
* Allocate a return stack for the idle task. May be the first
* time through, or it may be done by CPU hotplug online.
*/
void ftrace_graph_init_idle_task(struct task_struct *t, int cpu)
{
t->curr_ret_stack = -1;
/*
* The idle task has no parent, it either has its own
* stack or no stack at all.
*/
if (t->ret_stack)
WARN_ON(t->ret_stack != per_cpu(idle_ret_stack, cpu));
if (ftrace_graph_active) {
struct ftrace_ret_stack *ret_stack;
ret_stack = per_cpu(idle_ret_stack, cpu);
if (!ret_stack) {
ret_stack = kmalloc(FTRACE_RETFUNC_DEPTH
* sizeof(struct ftrace_ret_stack),
GFP_KERNEL);
if (!ret_stack)
return;
per_cpu(idle_ret_stack, cpu) = ret_stack;
}
graph_init_task(t, ret_stack);
}
}
/* Allocate a return stack for newly created task */ /* Allocate a return stack for newly created task */
void ftrace_graph_init_task(struct task_struct *t) void ftrace_graph_init_task(struct task_struct *t)
{ {
@ -3433,12 +3476,7 @@ void ftrace_graph_init_task(struct task_struct *t)
GFP_KERNEL); GFP_KERNEL);
if (!ret_stack) if (!ret_stack)
return; return;
atomic_set(&t->tracing_graph_pause, 0); graph_init_task(t, ret_stack);
atomic_set(&t->trace_overrun, 0);
t->ftrace_timestamp = 0;
/* make curr_ret_stack visable before we add the ret_stack */
smp_wmb();
t->ret_stack = ret_stack;
} }
} }