函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\cgroup\rstat.c Create Date:2022-07-27 12:13:53
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：see cgroup_rstat_flush()

函数原型：static void cgroup_rstat_flush_locked(struct cgroup *cgrp, bool may_sleep)__releases(&cgroup_rstat_lock) __acquires(&cgroup_rstat_lock)

返回类型：void

参数：

类型参数名称
struct cgroup *cgrp
boolmay_sleep
157  lockdep_assert_held( & cgroup_rstat_lock)
159  遍历可用CPU(cpu)
160  cpu_lock等于per_cpu_ptr( & cgroup_rstat_cpu_lock, cpu)
162  struct cgroup * pos = NULL
164  raw_spin_lock(cpu_lock)
165  当pos等于group_rstat_cpu_pop_updated - iterate and dismantle rstat_cpu updated tree*@pos: current position*@root: root of the tree to traversal*@cpu: target cpu* Walks the udpated rstat_cpu tree on @cpu from @root. %NULL @pos starts循环
168  cgroup_base_stat_flush(pos, cpu)
170  _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
171  遍历RCU(css, & rstat_css_list, rstat_css_node)
173  css_rstat_flush(css, cpu)
174  _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()
176  raw_spin_unlock(cpu_lock)
179  如果may_sleep且need_resched()或Does a critical section need to be broken due to another* task waiting?: (technically does not depend on CONFIG_PREEMPTION,* but a general need for low latency)的值则
181  spin_unlock_irq( & cgroup_rstat_lock)
182  如果非cond_resched()则cpu_relax()
184  spin_lock_irq( & cgroup_rstat_lock)
调用者
名称描述
cgroup_rstat_flushgroup_rstat_flush - flush stats in @cgrp's subtree*@cgrp: target cgroup* Collect all per-cpu stats in @cgrp's subtree into the global counters* and propagate them upwards
cgroup_rstat_flush_irqsafegroup_rstat_flush_irqsafe - irqsafe version of cgroup_rstat_flush()*@cgrp: target cgroup* This function can be called from any context.
cgroup_rstat_flush_holdgroup_rstat_flush_begin - flush stats in @cgrp's subtree and hold*@cgrp: target cgroup* Flush stats in @cgrp's subtree and prevent further flushes. Must be* paired with cgroup_rstat_flush_release().* This function may block.