函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:include\linux\percpu-refcount.h Create Date:2022-07-27 06:40:35
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：percpu计数

函数原型：static inline void percpu_ref_get_many(struct percpu_ref *ref, unsigned long nr)

返回类型：void

参数：

类型参数名称
struct percpu_ref *ref
unsigned longnr
187  __percpu乘percpu_count
189  _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
191  如果Internal helper. Don't use outside percpu-refcount proper. The* function doesn't return the pointer and let the caller test it for NULL* because doing so forces the compiler to generate two conditional则this_cpu_add( * percpu_count, nr)
193  否则atomic_long_add(nr, & count)
196  _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()
调用者
名称描述
percpu_ref_getpercpu计数引用增
css_get_many获取指定CSS参考