函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\cgroup\legacy_freezer.c Create Date:2022-07-27 12:16:34
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：zer_change_state - change the freezing state of a cgroup_freezer*@freezer: freezer of interest*@freeze: whether to freeze or thaw* Freeze or thaw @freezer according to @freeze. The operations are* recursive - all descendants of @freezer will be affected.

函数原型：static void freezer_change_state(struct freezer *freezer, bool freeze)

返回类型：void

参数：

类型参数名称
struct freezer *freezer
boolfreeze
394  mutex_lock( & freezer_mutex)
395  _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
397  pos_f等于css_freezer(pos)
398  parent等于parent_freezer(pos_f)
400  如果非ss_tryget_online - try to obtain a reference on the specified css if online*@css: target css* Obtain a reference on @css if it's online则继续下一循环
402  _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()
404  如果pos_f恒等于freezer则zer_apply_state - apply state change to a single cgroup_freezer*@freezer: freezer to apply state change to*@freeze: whether to freeze or unfreeze*@state: CGROUP_FREEZING_* flag to set or clear* Set or clear @state on @cgroup according to @freeze, and
407  否则zer_apply_state - apply state change to a single cgroup_freezer*@freezer: freezer to apply state change to*@freeze: whether to freeze or unfreeze*@state: CGROUP_FREEZING_* flag to set or clear* Set or clear @state on @cgroup according to @freeze, and
412  _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
413  设置一个css引用
415  _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()
416  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.
调用者
名称描述
freezer_write