ring_buffer_consume

Name:g_buffer_consume - return an event and consume it*@buffer: The ring buffer to get the next event from*@cpu: the cpu to read the buffer from*@ts: a variable to store the timestamp (may be NULL)*@lost_events: a variable to store if events were lost (may be

Proto:struct ring_buffer_event *ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts, unsigned long *lost_events)

Type:struct ring_buffer_event

Parameter:

Type	Parameter	Name
struct ring_buffer *	buffer
int	cpu
u64 *	ts
unsigned long *	lost_events

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struct ring_buffer_event * event = NULL

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again :

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Even if we don't have any preemption, we need preempt disable/enable* to be barriers, so that we don't have things like get_user/put_user* that can cause faults and scheduling migrate into our preempt-protected* region.()

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If Not pumask_test_cpu - test for a cpu in a cpumask*@cpu: cpu number (< nr_cpu_ids)*@cpumask: the cpumask pointer* Returns 1 if @cpu is set in @cpumask, else returns 0 Then Go to out

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cpu_buffer = buffers[cpu]

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local_irq_save(flags)

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dolock = rb_reader_lock(cpu_buffer)

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event = rb_buffer_peek(cpu_buffer, ts, lost_events)

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If event Then

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lost_events = 0

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rb_advance_reader(cpu_buffer)

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rb_reader_unlock(cpu_buffer, dolock)

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local_irq_restore(flags)

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out :

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preempt_enable()

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If event && type_len == RINGBUF_TYPE_PADDING Then Go to again

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Return event

**Caller**
Name	Describe
read_event
trace_consume
get_return_for_leaf

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