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ftrace: sysprof plugin improvement

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add sample maximum depth.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2008-05-12 21:20:47 +02:00 committed by Thomas Gleixner
parent a6dd24f8d0
commit 842af315e8
1 changed files with 3 additions and 6 deletions
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9
kernel/trace/trace_sysprof.c
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@ -23,6 +23,7 @@ static int __read_mostly tracer_enabled;
* 10 msecs for now:
*/
static const unsigned long sample_period = 1000000;
static const unsigned int sample_max_depth = 512;
/*
* Per CPU hrtimers that do the profiling:
@ -45,8 +46,6 @@ static int copy_stack_frame(const void __user *fp, struct stack_frame *frame)
return 1;
}
#define SYSPROF_MAX_ADDRESSES 512
static void timer_notify(struct pt_regs *regs, int cpu)
{
const void __user *frame_pointer;
@ -80,7 +79,7 @@ static void timer_notify(struct pt_regs *regs, int cpu)
frame_pointer = (void __user *)regs->bp;
for (i = 0; i < SYSPROF_MAX_ADDRESSES; i++) {
for (i = 0; i < sample_max_depth; i++) {
if (!copy_stack_frame(frame_pointer, &frame))
break;
if ((unsigned long)frame_pointer < regs->sp)
@ -93,7 +92,7 @@ static void timer_notify(struct pt_regs *regs, int cpu)
trace_special(tr, data, 2, current->pid, i);
if (i == SYSPROF_MAX_ADDRESSES)
if (i == sample_max_depth)
trace_special(tr, data, -1, -1, -1);
}
@ -126,7 +125,6 @@ static void start_stack_timers(void)
for_each_online_cpu(cpu) {
set_cpus_allowed_ptr(current, &cpumask_of_cpu(cpu));
start_stack_timer(cpu);
printk(KERN_INFO "started sysprof timer on cpu%d\n", cpu);
}
set_cpus_allowed_ptr(current, &saved_mask);
}
@ -136,7 +134,6 @@ static void stop_stack_timer(int cpu)
struct hrtimer *hrtimer = &per_cpu(stack_trace_hrtimer, cpu);
hrtimer_cancel(hrtimer);
printk(KERN_INFO "cancelled sysprof timer on cpu%d\n", cpu);
}
static void stop_stack_timers(void)