ftrace: sysprof plugin improvement
add sample maximum depth. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -23,6 +23,7 @@ static int __read_mostly tracer_enabled;
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* 10 msecs for now:
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* 10 msecs for now:
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*/
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*/
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static const unsigned long sample_period = 1000000;
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static const unsigned long sample_period = 1000000;
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static const unsigned int sample_max_depth = 512;
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/*
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/*
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* Per CPU hrtimers that do the profiling:
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* Per CPU hrtimers that do the profiling:
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@ -45,8 +46,6 @@ static int copy_stack_frame(const void __user *fp, struct stack_frame *frame)
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return 1;
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return 1;
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}
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}
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#define SYSPROF_MAX_ADDRESSES 512
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static void timer_notify(struct pt_regs *regs, int cpu)
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static void timer_notify(struct pt_regs *regs, int cpu)
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{
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{
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const void __user *frame_pointer;
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const void __user *frame_pointer;
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@ -80,7 +79,7 @@ static void timer_notify(struct pt_regs *regs, int cpu)
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frame_pointer = (void __user *)regs->bp;
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frame_pointer = (void __user *)regs->bp;
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for (i = 0; i < SYSPROF_MAX_ADDRESSES; i++) {
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for (i = 0; i < sample_max_depth; i++) {
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if (!copy_stack_frame(frame_pointer, &frame))
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if (!copy_stack_frame(frame_pointer, &frame))
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break;
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break;
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if ((unsigned long)frame_pointer < regs->sp)
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if ((unsigned long)frame_pointer < regs->sp)
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@ -93,7 +92,7 @@ static void timer_notify(struct pt_regs *regs, int cpu)
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trace_special(tr, data, 2, current->pid, i);
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trace_special(tr, data, 2, current->pid, i);
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if (i == SYSPROF_MAX_ADDRESSES)
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if (i == sample_max_depth)
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trace_special(tr, data, -1, -1, -1);
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trace_special(tr, data, -1, -1, -1);
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}
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}
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@ -126,7 +125,6 @@ static void start_stack_timers(void)
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for_each_online_cpu(cpu) {
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for_each_online_cpu(cpu) {
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set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
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set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
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start_stack_timer(cpu);
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start_stack_timer(cpu);
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printk(KERN_INFO "started sysprof timer on cpu%d\n", cpu);
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}
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}
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set_cpus_allowed_ptr(current, &saved_mask);
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set_cpus_allowed_ptr(current, &saved_mask);
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}
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}
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@ -136,7 +134,6 @@ static void stop_stack_timer(int cpu)
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struct hrtimer *hrtimer = &per_cpu(stack_trace_hrtimer, cpu);
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struct hrtimer *hrtimer = &per_cpu(stack_trace_hrtimer, cpu);
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hrtimer_cancel(hrtimer);
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hrtimer_cancel(hrtimer);
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printk(KERN_INFO "cancelled sysprof timer on cpu%d\n", cpu);
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}
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}
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static void stop_stack_timers(void)
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static void stop_stack_timers(void)
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