percpu_ref

函数名称：percpu计数引用减

函数原型：static inline void percpu_ref_put(struct percpu_ref *ref)

返回类型：void

参数：

类型	参数	名称
struct percpu_ref *	ref

**调用者**
名称	描述
percpu_ref_call_confirm_rcu
percpu_ref_kill_and_confirm	percpu_ref_kill_and_confirm - drop the initial ref and schedule confirmation@ref: percpu_ref to kill@confirm_kill: optional confirmation callback* Equivalent to percpu_ref_kill() but also schedules kill confirmation if*@confirm_kill is not NULL
blk_queue_enter	lk_queue_enter() - try to increase q->q_usage_counter@q: request queue pointer@flags: BLK_MQ_REQ_NOWAIT and/or BLK_MQ_REQ_PREEMPT
blk_queue_exit
blk_mq_sched_insert_requests
free_ioctx_users	When this function runs, the kioctx has been removed from the "hash table"* and ctx->users has dropped to 0, so we know no more kiocbs can be submitted -* now it's safe to cancel any that need to be.
iocb_destroy
SYSCALL_DEFINE2	sys_io_setup:* Create an aio_context capable of receiving at least nr_events
COMPAT_SYSCALL_DEFINE2
SYSCALL_DEFINE1	sys_io_destroy:* Destroy the aio_context specified. May cancel any outstanding * AIOs and block on completion. Will fail with -ENOSYS if not* implemented. May fail with -EINVAL if the context pointed to* is invalid.
SYSCALL_DEFINE3	sys_io_submit:* Queue the nr iocbs pointed to by iocbpp for processing
COMPAT_SYSCALL_DEFINE3
SYSCALL_DEFINE3	sys_io_cancel:* Attempts to cancel an iocb previously passed to io_submit. If* the operation is successfully cancelled, the resulting event is* copied into the memory pointed to by result without being placed* into the completion queue and 0 is returned
do_io_getevents
io_get_req
__io_free_req
SYSCALL_DEFINE6
put_dev_pagemap
hd_struct_put
css_put	设置一个css引用
cgroup_bpf_put
blkg_put	lkg_put - put a blkg reference*@blkg: blkg to put

函数逻辑报告