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 14:31:10
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：bpf_percpu_cgroup_storage_copy

函数原型：int bpf_percpu_cgroup_storage_copy(struct bpf_map *_map, void *_key, void *value)

返回类型：int

参数：

类型参数名称
struct bpf_map *_map
void *_key
void *value
173  map等于map_to_storage(_map)
174  key等于_key
176  off等于0
179  _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
180  storage等于cgroup_storage_lookup(map, key, false)
181  如果非storage则
182  _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()
183  返回:负ENOENT
190  size等于und_up - round up to next specified power of 2*@x: the value to round*@y: multiple to round up to (must be a power of 2)* Rounds @x up to next multiple of @y (which must be a power of 2).* To perform arbitrary rounding up, use roundup() below.(value_size, 8)
191  遍历可用CPU(cpu)
192  bpf_long_memcpy(value + off, per_cpu_ptr(percpu_buf, cpu), size)
194  off加等于size
196  _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()
197  返回:0
调用者
名称描述
map_lookup_elem