diff options
| author | Ingo Molnar <mingo@elte.hu> | 2008-05-12 21:20:47 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-05-23 23:39:47 +0200 |
| commit | 842af315e8b0adad58fc642eaa5e6f53525e0534 (patch) | |
| tree | a547f73d80f81e5b833283fa3cde264f1014079a /kernel/trace/trace_sysprof.c | |
| parent | a6dd24f8d00cbccb560b19a723e6fb9bdfb20799 (diff) | |
ftrace: sysprof plugin improvement
add sample maximum depth.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/trace/trace_sysprof.c')
| -rw-r--r-- | kernel/trace/trace_sysprof.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c index b78f12f77fc..7f6fcccffb8 100644 --- a/kernel/trace/trace_sysprof.c +++ b/kernel/trace/trace_sysprof.c @@ -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) |