函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\cgroup\cpuset.c Create Date:2022-07-27 12:19:44
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：cpuset_css_online

函数原型：static int cpuset_css_online(struct cgroup_subsys_state *css)

返回类型：int

参数：

类型参数名称
struct cgroup_subsys_state *css
2724  cs等于css_cs(css)
2725  parent等于parent_cs(cs)
2729  如果非parent则返回:0
2732  get_online_cpus()
2733  percpu_down_write( & cpuset_rwsem)
2735  设置内存位
2736  如果is_spread_page(parent)则设置内存位
2738  如果is_spread_slab(parent)则设置内存位
2741  cpuset_inc()
2743  spin_lock_irq( & callback_lock)
2744  如果Cgroup v2 behavior is used when on default hierarchy or the* cgroup_v2_mode flag is set.则
2745  pumask_copy - *dstp = *srcp*@dstp: the result*@srcp: the input cpumask
2746  effective_mems等于effective_mems
2747  * Default hierarchy only: * use_parent_ecpus - set if using parent's effective_cpus * child_ecpus_count - # of children with use_parent_ecpus set = true
2748  child_ecpus_count自加
2750  spin_unlock_irq( & callback_lock)
2752  如果非st_bit - Determine whether a bit is set*@nr: bit number to test*@addr: Address to start counting from则转到:out_unlock
2768  _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
2769  cpuset_for_each_child - traverse online children of a cpuset*@child_cs: loop cursor pointing to the current child*@pos_css: used for iteration*@parent_cs: target cpuset to walk children of* Walk @child_cs through the online children of @parent_cs(tmp_cs, pos_css, parent)
2770  如果is_mem_exclusive(tmp_cs)或is_cpu_exclusive(tmp_cs)则
2771  _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()
2772  转到:out_unlock
2775  _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()
2777  spin_lock_irq( & callback_lock)
2778  mems_allowed等于mems_allowed
2779  effective_mems等于mems_allowed
2780  pumask_copy - *dstp = *srcp*@dstp: the result*@srcp: the input cpumask
2781  pumask_copy - *dstp = *srcp*@dstp: the result*@srcp: the input cpumask
2782  spin_unlock_irq( & callback_lock)
2783  out_unlock :
2784  percpu_up_write( & cpuset_rwsem)
2785  put_online_cpus()
2786  返回:0