函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\cgroup\pids.c Create Date:2022-07-27 12:16:49
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：ask_css_check(true) in pids_can_fork() and pids_cancel_fork() relies* on cgroup_threadgroup_change_begin() held by the copy_process().

函数原型：static int pids_can_fork(struct task_struct *task)

返回类型：int

参数：

类型参数名称
struct task_struct *task
223  css等于ask_css_check - obtain css for (task, subsys) w/ extra access conds*@task: the target task*@subsys_id: the target subsystem ID*@__c: extra condition expression to be passed to rcu_dereference_check()(当前进程, pids_cgrp_id, true)
224  pids等于css_pids(css)
225  err等于pids_try_charge - hierarchically try to charge the pid count*@pids: the pid cgroup state*@num: the number of pids to charge* This function follows the set limit. It will fail if the charge would cause* the new value to exceed the hierarchical limit
226  如果err则
228  如果atomic64_inc_return( & Number of times fork failed because limit was hit. )恒等于1则
229  打印信息("cgroup: fork rejected by pids controller in ")
230  pr_cont_cgroup_path(PI: the cgroup that this css is attached to )
231  打印标准信息("\n")
233  group_file_notify - generate a file modified event for a cgroup_file*@cfile: target cgroup_file*@cfile must have been obtained by setting cftype->file_offset.
235  返回:err