函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\bpf\local_storage.c Create Date:2022-07-27 14:31:32
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：cgroup_storage_seq_show_elem

函数原型：static void cgroup_storage_seq_show_elem(struct bpf_map *map, void *_key, struct seq_file *m)

返回类型：void

参数：

类型参数名称
struct bpf_map *map
void *_key
struct seq_file *m
379  stype等于cgroup_storage_type(map)
380  key等于_key
384  _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
385  storage等于cgroup_storage_lookup(map_to_storage(map), key, false)
386  如果非storage则
387  _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()
388  返回
391  btf_type_seq_show(btf, btf_key_type_id, key, m)
392  stype等于cgroup_storage_type(map)
393  如果stype恒等于BPF_CGROUP_STORAGE_SHARED则
394  seq_puts(m, ": ")
395  btf_type_seq_show(btf, btf_value_type_id, & data[0], m)
397  seq_puts(m, "\n")
398  否则
399  seq_puts(m, ": {\n")
400  遍历可用CPU(cpu)
401  seq_printf(m, "\tcpu%d: ", cpu)
402  btf_type_seq_show(btf, btf_value_type_id, per_cpu_ptr(percpu_buf, cpu), m)
405  seq_puts(m, "\n")
407  seq_puts(m, "}\n")
409  _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()