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 12:16:30
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：freezer_read

函数原型：static int freezer_read(struct seq_file *m, void *v)

返回类型：int

参数：

类型参数名称
struct seq_file *m
void *v
293  css等于seq_css(m)
295  mutex_lock( & freezer_mutex)
296  _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
300  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
302  _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()
304  pdate_if_frozen - update whether a cgroup finished freezing*@css: css of interest* Once FREEZING is initiated, transition to FROZEN is lazily updated by* calling this function
306  _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
307  设置一个css引用
310  _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()
311  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.
313  seq_puts(m, freezer_state_strs(state))
314  seq_putc(m, '\n')
315  返回:0