__rb_reserve_next

Name:__rb_reserve_next

Proto:static struct ring_buffer_event *__rb_reserve_next(struct ring_buffer_per_cpu *cpu_buffer, struct rb_event_info *info)

Type:struct ring_buffer_event

Parameter:

Type	Parameter	Name
struct ring_buffer_per_cpu *	cpu_buffer
struct rb_event_info *	info

2828

If Value for the false possibility is greater at compile time(add_timestamp) Then length += RB_LEN_TIME_EXTEND

2832

tail_page = tail_page = READ_ONCE(write to tail )

2833

write = local_add_return - add and return*@i: integer value to add*@l: pointer to type local_t* Atomically adds @i to @l and returns @i + @l

2836

write &= The buffer page counters, write and entries, must be reset* atomically when crossing page boundaries. To synchronize this* update, two counters are inserted into the number. One is* the actual counter for the write position or count on the page.

2837

tail = write - length

2843

If Not tail && Not ring_buffer_time_stamp_abs(buffer) Then delta = 0

2847

If Value for the false possibility is greater at compile time(write > BUF_PAGE_SIZE) Then Return This is the slow path, force gcc not to inline it.

2852

event = __rb_page_index(tail_page, tail)

2853

_update_event - update event type and data*@event: the event to update*@type: the type of event*@length: the size of the event field in the ring buffer* Update the type and data fields of the event

2855

local_inc( & ries on this page )

2861

If Not tail Then page time stamp = ts

2865

local_add(length, & entries_bytes)

2867

Return event

**Caller**
Name	Describe
rb_reserve_next_event

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