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ftrace: sysprof updates
make the sample period configurable. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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parent
9f6b4e3f4a
commit
d618b3e6e5
kernel/trace
@ -2800,6 +2800,9 @@ static __init void tracer_init_debugfs(void)
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pr_warning("Could not create debugfs "
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"'dyn_ftrace_total_info' entry\n");
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#endif
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#ifdef CONFIG_SYSPROF_TRACER
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init_tracer_sysprof_debugfs(d_tracer);
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#endif
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}
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static int trace_alloc_page(void)
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@ -188,6 +188,8 @@ struct trace_iterator {
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void tracing_reset(struct trace_array_cpu *data);
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int tracing_open_generic(struct inode *inode, struct file *filp);
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struct dentry *tracing_init_dentry(void);
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void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
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void ftrace(struct trace_array *tr,
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struct trace_array_cpu *data,
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unsigned long ip,
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@ -20,11 +20,12 @@ static struct trace_array *sysprof_trace;
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static int __read_mostly tracer_enabled;
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/*
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* 10 msecs for now:
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* 1 msec sample interval by default:
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*/
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static const unsigned long sample_period = 1000000;
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static unsigned long sample_period = 1000000;
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static const unsigned int sample_max_depth = 512;
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static DEFINE_MUTEX(sample_timer_lock);
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/*
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* Per CPU hrtimers that do the profiling:
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*/
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@ -166,15 +167,19 @@ static notrace void stack_reset(struct trace_array *tr)
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static notrace void start_stack_trace(struct trace_array *tr)
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{
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mutex_lock(&sample_timer_lock);
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stack_reset(tr);
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start_stack_timers();
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tracer_enabled = 1;
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mutex_unlock(&sample_timer_lock);
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}
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static notrace void stop_stack_trace(struct trace_array *tr)
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{
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mutex_lock(&sample_timer_lock);
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stop_stack_timers();
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tracer_enabled = 0;
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mutex_unlock(&sample_timer_lock);
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}
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static notrace void stack_trace_init(struct trace_array *tr)
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@ -216,3 +221,64 @@ __init static int init_stack_trace(void)
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return register_tracer(&stack_trace);
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}
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device_initcall(init_stack_trace);
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#define MAX_LONG_DIGITS 22
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static ssize_t
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sysprof_sample_read(struct file *filp, char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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char buf[MAX_LONG_DIGITS];
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int r;
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r = sprintf(buf, "%ld\n", nsecs_to_usecs(sample_period));
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return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
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}
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static ssize_t
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sysprof_sample_write(struct file *filp, const char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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char buf[MAX_LONG_DIGITS];
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unsigned long val;
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if (cnt > MAX_LONG_DIGITS-1)
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cnt = MAX_LONG_DIGITS-1;
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if (copy_from_user(&buf, ubuf, cnt))
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return -EFAULT;
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buf[cnt] = 0;
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val = simple_strtoul(buf, NULL, 10);
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/*
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* Enforce a minimum sample period of 100 usecs:
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*/
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if (val < 100)
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val = 100;
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mutex_lock(&sample_timer_lock);
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stop_stack_timers();
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sample_period = val * 1000;
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start_stack_timers();
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mutex_unlock(&sample_timer_lock);
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return cnt;
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}
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static struct file_operations sysprof_sample_fops = {
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.read = sysprof_sample_read,
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.write = sysprof_sample_write,
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};
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void init_tracer_sysprof_debugfs(struct dentry *d_tracer)
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{
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struct dentry *entry;
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entry = debugfs_create_file("sysprof_sample_period", 0644,
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d_tracer, NULL, &sysprof_sample_fops);
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if (entry)
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return;
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pr_warning("Could not create debugfs 'dyn_ftrace_total_info' entry\n");
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}
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