rcu_init_geometry

函数名称：Compute the rcu_node tree geometry from kernel parameters. This cannot* replace the definitions in tree.h because those are needed to size* the ->node array in the rcu_state structure.

函数原型：static void __init rcu_init_geometry(void)

返回类型：void

参数：无

3474

d等于RCU_JIFFIES_TILL_FORCE_QS加nr_cpu_ids除Very large systems need more

3475

如果jiffies_till_first_fqs恒等于ULONG_MAX则jiffies_till_first_fqs等于d

3477

如果jiffies_till_next_fqs恒等于ULONG_MAX则jiffies_till_next_fqs等于d

3479

Make sure that we give the grace-period kthread time to detect any* idle CPUs before taking active measures to force quiescent states.* However, don't go below 100 milliseconds, adjusted upwards for really* large systems.

3482

如果Increase (but not decrease) the RCU_FANOUT_LEAF at boot time. 恒等于RCU_FANOUT_LEAF且nr_cpu_ids恒等于CPU数量则返回

3485

打印信息("Adjusting geometry for rcu_fanout_leaf=%d, nr_cpu_ids=%u\n", Increase (but not decrease) the RCU_FANOUT_LEAF at boot time. , nr_cpu_ids)

3494

如果Increase (but not decrease) the RCU_FANOUT_LEAF at boot time. 小于2或Increase (but not decrease) the RCU_FANOUT_LEAF at boot time. 大于sizeof(unsignedlong)乘8则

3496

Increase (but not decrease) the RCU_FANOUT_LEAF at boot time. 等于RCU_FANOUT_LEAF

3497

WARN_ON(1)

3498

3505

rcu_capacity[0]等于Increase (but not decrease) the RCU_FANOUT_LEAF at boot time.

3506

以i小于RCU_NUM_LVLS 循环 rcu_capacity[i]等于rcu_capacity[i - 1]乘RCU_FANOUT

3513

如果nr_cpu_ids大于rcu_capacity[RCU_NUM_LVLS - 1]则

3514

Increase (but not decrease) the RCU_FANOUT_LEAF at boot time. 等于RCU_FANOUT_LEAF

3515

WARN_ON(1)

3516

3520

以nr_cpu_ids大于rcu_capacity[i]循环 rcu_num_lvls等于i加1

3525

以i小于rcu_num_lvls 循环

3526

cap等于rcu_capacity[(rcu_num_lvls - 1) - i]

3527

Number of rcu_nodes at specified level. [i]等于DIV_ROUND_UP(nr_cpu_ids, cap)

3531

rcu_num_nodes等于0

3532

以i小于rcu_num_lvls 循环 rcu_num_nodes加等于Number of rcu_nodes at specified level. [i]

**调用者**
名称	描述
rcu_init	初始化直接读拷贝更新的锁机制

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

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