tracing_start

Name:racing_start - quick start of the tracer* If tracing is enabled but was stopped by tracing_stop,* this will start the tracer back up.

Proto:void tracing_start(void)

Type:void

Parameter:Nothing

2106

If Kill all tracing for good (never come back).* It is initialized to 1 but will turn to zero if the initialization* of the tracer is successful. But that is the only place that sets* this back to zero. Then Return

2109

raw_spin_lock_irqsave( & start_lock, flags)

2110

If --stop_count Then

2111

If stop_count < 0 Then

2113

WARN_ON_ONCE(1)

2114

2116

Go to out

2120

r sched/core.c and kernel_lock.c: ( & * max_lock is used to protect the swapping of buffers * when taking a max snapshot. The buffers themselves are * protected by per_cpu spinlocks. But the action of the swap * needs its own lock. * This is defined as a arch_spinlock_t in order to help * with)

2122

buffer = buffer

2123

If buffer Then g_buffer_record_enable - enable writes to the buffer*@buffer: The ring buffer to enable writes* Note, multiple disables will need the same number of enables* to truly enable the writing (much like preempt_disable).

2132

arch_spin_unlock( & * max_lock is used to protect the swapping of buffers * when taking a max snapshot. The buffers themselves are * protected by per_cpu spinlocks. But the action of the swap * needs its own lock. * This is defined as a arch_spinlock_t in order to help * with)

2134

out :

2135

raw_spin_unlock_irqrestore( & start_lock, flags)

**Caller**
Name	Describe
tracing_start_tr

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