percpu_ref_put

函数名称：percpu_ref_put_many - decrement a percpu refcount*@ref: percpu_ref to put*@nr: number of references to put* Decrement the refcount, and if 0, call the release function (which was passed* to percpu_ref_init())

函数原型：static inline void percpu_ref_put_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 long	nr

286

__percpu乘percpu_count

288

_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

290

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_sub( * percpu_count, nr)

292

否则如果此条件成立可能性小(为编译器优化)(atomic_long_sub_and_test(nr, & count))则release(ref)

295

_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
io_free_req_many
percpu_ref_put	percpu计数引用减
css_put_many	设置一个css引用

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告