x86-tsc: Architectures may define their own clocks. For
example, x86 uses its own TSC cycle clock here.
+ ppc-tb: This uses the powerpc timebase register value.
+ This is in sync across CPUs and can also be used
+ to correlate events across hypervisor/guest if
+ tb_offset is known.
+
To set a clock, simply echo the clock name into this file.
echo global > trace_clock
The marks are determined by the difference between this
current trace and the next trace.
'$' - greater than 1 second
+ '@' - greater than 100 milisecond
+ '*' - greater than 10 milisecond
'#' - greater than 1000 microsecond
'!' - greater than 100 microsecond
'+' - greater than 10 microsecond
ie:
- 0) | up_write() {
- 0) 0.646 us | _spin_lock_irqsave();
- 0) 0.684 us | _spin_unlock_irqrestore();
- 0) 3.123 us | }
- 0) 0.548 us | fput();
- 0) + 58.628 us | }
+ 3) # 1837.709 us | } /* __switch_to */
+ 3) | finish_task_switch() {
+ 3) 0.313 us | _raw_spin_unlock_irq();
+ 3) 3.177 us | }
+ 3) # 1889.063 us | } /* __schedule */
+ 3) ! 140.417 us | } /* __schedule */
+ 3) # 2034.948 us | } /* schedule */
+ 3) * 33998.59 us | } /* schedule_preempt_disabled */
[...]
- 0) | putname() {
- 0) | kmem_cache_free() {
- 0) 0.518 us | __phys_addr();
- 0) 1.757 us | }
- 0) 2.861 us | }
- 0) ! 115.305 us | }
- 0) ! 116.402 us | }
+ 1) 0.260 us | msecs_to_jiffies();
+ 1) 0.313 us | __rcu_read_unlock();
+ 1) + 61.770 us | }
+ 1) + 64.479 us | }
+ 1) 0.313 us | rcu_bh_qs();
+ 1) 0.313 us | __local_bh_enable();
+ 1) ! 217.240 us | }
+ 1) 0.365 us | idle_cpu();
+ 1) | rcu_irq_exit() {
+ 1) 0.417 us | rcu_eqs_enter_common.isra.47();
+ 1) 3.125 us | }
+ 1) ! 227.812 us | }
+ 1) ! 457.395 us | }
+ 1) @ 119760.2 us | }
+
+ [...]
+
+ 2) | handle_IPI() {
+ 1) 6.979 us | }
+ 2) 0.417 us | scheduler_ipi();
+ 1) 9.791 us | }
+ 1) + 12.917 us | }
+ 2) 3.490 us | }
+ 1) + 15.729 us | }
+ 1) + 18.542 us | }
+ 2) $ 3594274 us | }
+ means that the function exceeded 10 usecs.
! means that the function exceeded 100 usecs.
# means that the function exceeded 1000 usecs.
+ * means that the function exceeded 10 msecs.
+ @ means that the function exceeded 100 msecs.
$ means that the function exceeded 1 sec.
struct pid *pid;
};
+static bool ftrace_pids_enabled(void)
+{
+ return !list_empty(&ftrace_pids);
+}
+
+static void ftrace_update_trampoline(struct ftrace_ops *ops);
+
/*
* ftrace_disabled is set when an anomaly is discovered.
* ftrace_disabled is much stronger than ftrace_enabled.
static struct ftrace_ops *ftrace_control_list __read_mostly = &ftrace_list_end;
static struct ftrace_ops *ftrace_ops_list __read_mostly = &ftrace_list_end;
ftrace_func_t ftrace_trace_function __read_mostly = ftrace_stub;
-ftrace_func_t ftrace_pid_function __read_mostly = ftrace_stub;
static struct ftrace_ops global_ops;
static struct ftrace_ops control_ops;
if (!test_tsk_trace_trace(current))
return;
- ftrace_pid_function(ip, parent_ip, op, regs);
-}
-
-static void set_ftrace_pid_function(ftrace_func_t func)
-{
- /* do not set ftrace_pid_function to itself! */
- if (func != ftrace_pid_func)
- ftrace_pid_function = func;
+ op->saved_func(ip, parent_ip, op, regs);
}
/**
void clear_ftrace_function(void)
{
ftrace_trace_function = ftrace_stub;
- ftrace_pid_function = ftrace_stub;
}
static void control_ops_disable_all(struct ftrace_ops *ops)
} else
add_ftrace_ops(&ftrace_ops_list, ops);
+ /* Always save the function, and reset at unregistering */
+ ops->saved_func = ops->func;
+
+ if (ops->flags & FTRACE_OPS_FL_PID && ftrace_pids_enabled())
+ ops->func = ftrace_pid_func;
+
ftrace_update_trampoline(ops);
if (ftrace_enabled)
if (ftrace_enabled)
update_ftrace_function();
+ ops->func = ops->saved_func;
+
return 0;
}
static void ftrace_update_pid_func(void)
{
+ bool enabled = ftrace_pids_enabled();
+ struct ftrace_ops *op;
+
/* Only do something if we are tracing something */
if (ftrace_trace_function == ftrace_stub)
return;
+ do_for_each_ftrace_op(op, ftrace_ops_list) {
+ if (op->flags & FTRACE_OPS_FL_PID) {
+ op->func = enabled ? ftrace_pid_func :
+ op->saved_func;
+ ftrace_update_trampoline(op);
+ }
+ } while_for_each_ftrace_op(op);
+
update_ftrace_function();
}
goto out;
}
+ #ifdef CONFIG_FUNCTION_GRAPH_TRACER
+ avg = rec->time;
+ do_div(avg, rec->counter);
+ if (tracing_thresh && (avg < tracing_thresh))
+ goto out;
+ #endif
+
kallsyms_lookup(rec->ip, NULL, NULL, NULL, str);
seq_printf(m, " %-30.30s %10lu", str, rec->counter);
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
seq_puts(m, " ");
- avg = rec->time;
- do_div(avg, rec->counter);
/* Sample standard deviation (s^2) */
if (rec->counter <= 1)
.local_hash.filter_hash = EMPTY_HASH,
INIT_OPS_HASH(global_ops)
.flags = FTRACE_OPS_FL_RECURSION_SAFE |
- FTRACE_OPS_FL_INITIALIZED,
+ FTRACE_OPS_FL_INITIALIZED |
+ FTRACE_OPS_FL_PID,
};
/*
static struct ftrace_ops global_ops = {
.func = ftrace_stub,
- .flags = FTRACE_OPS_FL_RECURSION_SAFE | FTRACE_OPS_FL_INITIALIZED,
+ .flags = FTRACE_OPS_FL_RECURSION_SAFE |
+ FTRACE_OPS_FL_INITIALIZED |
+ FTRACE_OPS_FL_PID,
};
static int __init ftrace_nodyn_init(void)
if (WARN_ON(tr->ops->func != ftrace_stub))
printk("ftrace ops had %pS for function\n",
tr->ops->func);
- /* Only the top level instance does pid tracing */
- if (!list_empty(&ftrace_pids)) {
- set_ftrace_pid_function(func);
- func = ftrace_pid_func;
- }
}
tr->ops->func = func;
tr->ops->private = tr;
{
mutex_lock(&ftrace_lock);
- if (list_empty(&ftrace_pids) && (!*pos))
+ if (!ftrace_pids_enabled() && (!*pos))
return (void *) 1;
return seq_list_start(&ftrace_pids, *pos);
.func = ftrace_stub,
.flags = FTRACE_OPS_FL_RECURSION_SAFE |
FTRACE_OPS_FL_INITIALIZED |
+ FTRACE_OPS_FL_PID |
FTRACE_OPS_FL_STUB,
#ifdef FTRACE_GRAPH_TRAMP_ADDR
.trampoline = FTRACE_GRAPH_TRAMP_ADDR,
projects / cascardo / linux.git / commitdiff