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 12:20:02
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：CPU / memory hotplug is handled asynchronously.

函数原型：static void cpuset_hotplug_workfn(struct work_struct *work)

返回类型：void

参数：

类型参数名称
struct work_struct *work
3124  on_dfl等于Cgroup v2 behavior is used when on default hierarchy or the* cgroup_v2_mode flag is set.
3125  struct tmpmasks tmp, * ptmp = NULL
3127  如果on_dfl且非alloc_cpumasks - allocate three cpumasks for cpuset*@cs: the cpuset that have cpumasks to be allocated.*@tmp: the tmpmasks structure pointer* Return: 0 if successful, -ENOMEM otherwise.* Only one of the two input arguments should be non-NULL.则ptmp等于tmp
3130  percpu_down_write( & cpuset_rwsem)
3133  pumask_copy - *dstp = *srcp*@dstp: the result*@srcp: the input cpumask
3134  new_mems等于The following particular system nodemasks and operations* on them manage all possible and online nodes.[N_MEMORY]
3141  cpus_updated等于非pumask_equal - *src1p == *src2p*@src1p: the first input*@src2p: the second input
3142  mems_updated等于非nodes_equal(effective_mems, new_mems)
3145  如果cpus_updated则
3146  spin_lock_irq( & callback_lock)
3147  如果非on_dfl则pumask_copy - *dstp = *srcp*@dstp: the result*@srcp: the input cpumask
3155  如果 number of CPUs in subparts_cpus 则
3156  如果pumask_subset - (*src1p & ~*src2p) == 0*@src1p: the first input*@src2p: the second input* Returns 1 if *@src1p is a subset of *@src2p, else returns 0则
3160  否则
3165  pumask_copy - *dstp = *srcp*@dstp: the result*@srcp: the input cpumask
3166  spin_unlock_irq( & callback_lock)
3171  如果mems_updated则
3172  spin_lock_irq( & callback_lock)
3173  如果非on_dfl则mems_allowed等于new_mems
3175  effective_mems等于new_mems
3176  spin_unlock_irq( & callback_lock)
3177  pdate_tasks_nodemask - Update the nodemasks of tasks in the cpuset.*@cs: the cpuset in which each task's mems_allowed mask needs to be changed* Iterate through each task of @cs updating its mems_allowed to the* effective cpuset's
3180  percpu_up_write( & cpuset_rwsem)
3183  如果cpus_updated或mems_updated则
3187  _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
3188  cpuset_for_each_descendant_pre - pre-order walk of a cpuset's descendants*@des_cs: loop cursor pointing to the current descendant*@pos_css: used for iteration*@root_cs: target cpuset to walk ancestor of(cs, pos_css, & top_cpuset)
3189  如果cs恒等于top_cpuset或非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
3191  _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()
3193  puset_hotplug_update_tasks - update tasks in a cpuset for hotunplug*@cs: cpuset in interest*@tmp: the tmpmasks structure pointer* Compare @cs's cpu and mem masks against top_cpuset and if some have gone* offline, update @cs accordingly
3195  _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
3196  设置一个css引用
3198  _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()
3202  如果cpus_updated或force_rebuild则
3203  force_rebuild = false
3204  rebuild_sched_domains()
3207  _cpumasks - free cpumasks in a tmpmasks structure*@cs: the cpuset that have cpumasks to be free.*@tmp: the tmpmasks structure pointer