函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\events\core.c Create Date:2022-07-27 14:54:08
Last Modify:2022-05-20 07:50:19 Copyright©Brick
首页 函数Tree
注解内核,赢得工具下载SCCTEnglish

函数名称：Remove user event from the owner task.

函数原型：static void perf_remove_from_owner(struct perf_event *event)

返回类型：void

参数：

类型参数名称
struct perf_event *event
4661  _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
4668  owner等于READ_ONCE(owner)
4669  如果owner则
4675  get_task_struct(owner)
4677  _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()
4679  如果owner则
4688  mutex_lock_nested( & perf_event_mutex, For trivial one-depth nesting of a lock-class, the following* global define can be used. (Subsystems with multiple levels* of nesting should define their own lock-nesting subclasses.))
4696  如果owner则
4697  删除链表项并重新初始化
4698  smp_store_release( & owner, NULL)
4700  mutex_unlock - release the mutex*@lock: the mutex to be released* Unlock a mutex that has been locked by this task previously.* This function must not be used in interrupt context. Unlocking* of a not locked mutex is not allowed.
4701  put_task_struct(owner)
调用者
名称描述
perf_event_release_kernelKill an event dead; while event:refcount will preserve the event* object, it will not preserve its functionality. Once the last 'user'* gives up the object, we'll destroy the thing.