函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\events\ring_buffer.c Create Date:2022-07-27 15:03:02
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：ring_buffer_init

函数原型：static void ring_buffer_init(struct ring_buffer *rb, long watermark, int flags)

返回类型：void

参数：

类型参数名称
struct ring_buffer *rb
longwatermark
intflags
306  max_size等于perf_data_size(rb)
308  如果watermark则 wakeup watermark 等于两数取小(max_size, watermark)
311  如果非 wakeup watermark 则 wakeup watermark 等于max_size除2
314  如果flags按位与Buffer handling 则 can overwrite itself 等于0
316  否则 can overwrite itself 等于1
319  _set - set a refcount's value*@r: the refcount*@n: value to which the refcount will be set
321  初始化链表头
322  spin_lock_init( & poll crap )
328  如果非 nr of data pages 则 can write into ring buffer 等于1
调用者
名称描述
rb_alloc