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 12:18:52
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：pdate_cpumasks_hier - Update effective cpumasks and tasks in the subtree*@cs: the cpuset to consider*@tmp: temp variables for calculating effective_cpus & partition setup* When congifured cpumask is changed, the effective cpumasks of this cpuset

函数原型：static void update_cpumasks_hier(struct cpuset *cs, struct tmpmasks *tmp)

返回类型：void

参数：

类型参数名称
struct cpuset *cs
struct tmpmasks *tmp
1296  bool need_rebuild_sched_domains = false
1298  _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
1299  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(cp, pos_css, cs)
1300  parent等于parent_cs(cp)
1302  mpute_effective_cpumask - Compute the effective cpumask of the cpuset*@new_cpus: the temp variable for the new effective_cpus mask*@cs: the cpuset the need to recompute the new effective_cpus mask*@parent: the parent cpuset* If the parent has subpartition
1308  如果Cgroup v2 behavior is used when on default hierarchy or the* cgroup_v2_mode flag is set.且pumask_empty - *srcp == 0*@srcp: the cpumask to that all cpus < nr_cpu_ids are clear.则
1309  pumask_copy - *dstp = *srcp*@dstp: the result*@srcp: the input cpumask
1310  如果非* Default hierarchy only: * use_parent_ecpus - set if using parent's effective_cpus * child_ecpus_count - # of children with use_parent_ecpus set则
1314  否则如果* Default hierarchy only: * use_parent_ecpus - set if using parent's effective_cpus * child_ecpus_count - # of children with use_parent_ecpus set则
1315  * Default hierarchy only: * use_parent_ecpus - set if using parent's effective_cpus * child_ecpus_count - # of children with use_parent_ecpus set = false
1316  WARN_ON_ONCE(!child_ecpus_count)
1317  child_ecpus_count自减
1324  如果非 partition root state 且pumask_equal - *src1p == *src2p*@src1p: the first input*@src2p: the second input则
1326  pos_css等于ss_rightmost_descendant - return the rightmost descendant of a css*@pos: css of interest* Return the rightmost descendant of @pos
1327  继续下一循环
1336  如果cp不等于cs且 partition root state 则
1338  当: partition root state 恒等于Partition root states:* 0 - not a partition root* 1 - partition root* -1 - invalid partition root* None of the cpus in cpus_allowed can be put into the parent's* subparts_cpus. In this case, the cpuset is not a real partition* root anymore
1358  当: partition root state 恒等于PRS_ENABLED
1363  当: partition root state 恒等于PRS_ERROR
1376  如果非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
1378  _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()
1380  spin_lock_irq( & callback_lock)
1382  pumask_copy - *dstp = *srcp*@dstp: the result*@srcp: the input cpumask
1383  如果 number of CPUs in subparts_cpus 且 partition root state 不等于PRS_ENABLED则
1385  number of CPUs in subparts_cpus 等于0
1386  清空全部CPU信息
1387  否则如果 number of CPUs in subparts_cpus 则
1397  pumask_andnot - *dstp = *src1p & ~*src2p*@dstp: the cpumask result*@src1p: the first input*@src2p: the second input* If *@dstp is empty, returns 0, else returns 1
1399  如果pumask_empty - *srcp == 0*@srcp: the cpumask to that all cpus < nr_cpu_ids are clear.则
1403  否则如果非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
1411  spin_unlock_irq( & callback_lock)
1413  WARN_ON(!Cgroup v2 behavior is used when on default hierarchy or the* cgroup_v2_mode flag is set. && !pumask_equal - *src1p == *src2p*@src1p: the first input*@src2p: the second input)
1416  pdate_tasks_cpumask - Update the cpumasks of tasks in the cpuset.*@cs: the cpuset in which each task's cpus_allowed mask needs to be changed* Iterate through each task of @cs updating its cpus_allowed to the* effective cpuset's
1424  如果非pumask_empty - *srcp == 0*@srcp: the cpumask to that all cpus < nr_cpu_ids are clear.且is_sched_load_balance(cp)且非cgroup_subsys_on_dfl - fast test on whether a subsys is on default hierarchy*@ss: subsystem in question(This file *must* be included with SUBSYS() defined.)或is_partition_root(cp)的值则need_rebuild_sched_domains = true
1430  _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
1431  设置一个css引用
1433  _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()
1435  如果need_rebuild_sched_domains则rebuild_sched_domains_locked()
调用者
名称描述
update_sibling_cpumaskspdate_sibling_cpumasks - Update siblings cpumasks*@parent: Parent cpuset*@cs: Current cpuset*@tmp: Temp variables
update_cpumaskpdate_cpumask - update the cpus_allowed mask of a cpuset and all tasks in it*@cs: the cpuset to consider*@trialcs: trial cpuset*@buf: buffer of cpu numbers written to this cpuset