函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\cgroup\cgroup.c Create Date:2022-07-27 12:09:15
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：group_tryget_css - try to get a cgroup's css for the specified subsystem*@cgrp: the cgroup of interest*@ss: the subsystem of interest* Find and get @cgrp's css assocaited with @ss. If the css doesn't exist* or is offline, %NULL is returned.

函数原型：static struct cgroup_subsys_state *cgroup_tryget_css(struct cgroup *cgrp, struct cgroup_subsys *ss)

返回类型：struct cgroup_subsys_state

参数：

类型参数名称
struct cgroup *cgrp
struct cgroup_subsys *ss
489  _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
490  css等于group_css - obtain a cgroup's css for the specified subsystem*@cgrp: the cgroup of interest*@ss: the subsystem of interest (%NULL returns @cgrp->self)* Return @cgrp's css (cgroup_subsys_state) associated with @ss
491  如果css且非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css = NULL
493  _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()
495  返回:css
调用者
名称描述
cgroup_extra_stat_show