Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\trace\ring_buffer.c Create Date:2022-07-28 11:55:18
Last Modify:2020-03-17 19:30:04 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:g_buffer_peek - peek at the next event to be read*@buffer: The ring buffer to read*@cpu: The cpu to peak at*@ts: The timestamp counter of this event

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

Type:struct ring_buffer_event

Parameter:

TypeParameterName
struct ring_buffer *buffer
intcpu
u64 *ts
unsigned long *lost_events
4083  cpu_buffer = buffers[cpu]
4088  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 Return NULL
4091  again :
4092  local_irq_save(flags)
4093  dolock = rb_reader_lock(cpu_buffer)
4094  event = rb_buffer_peek(cpu_buffer, ts, lost_events)
4095  If event && type_len == RINGBUF_TYPE_PADDING Then rb_advance_reader(cpu_buffer)
4097  rb_reader_unlock(cpu_buffer, dolock)
4098  local_irq_restore(flags)
4100  If event && type_len == RINGBUF_TYPE_PADDING Then Go to again
4103  Return event
Caller
NameDescribe
peek_next_entry
get_return_for_leaf