perf_event_init_userpage

Name:perf_event_init_userpage

Proto:static void perf_event_init_userpage(struct perf_event *event)

Type:void

Parameter:

Type	Parameter	Name
struct perf_event *	event

5438

_read_lock() - mark the beginning of an RCU read-side critical section* When synchronize_rcu() is invoked on one CPU while other CPUs* are within RCU read-side critical sections, then the* synchronize_rcu() is guaranteed to block until after all the other

5439

rb = fetch RCU-protected pointer for dereferencing(rb)

5440

If Not rb Then Go to unlock

5443

userpg = user_page

5446

Always 1, signals that bit 0 is zero = 1

5447

Header size up to __reserved[] fields. = offsetof(structperf_event_mmap_page, __reserved)

5448

where the buffer starts = PAGE_SIZE

5449

data buffer size = perf_data_size(rb)

5451

5452

_read_unlock() - marks the end of an RCU read-side critical section.* In most situations, rcu_read_unlock() is immune from deadlock.* However, in kernels built with CONFIG_RCU_BOOST, rcu_read_unlock()

**Caller**
Name	Describe
perf_mmap

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