Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:kernel\bpf\hashtab.c Create Date:2022-07-28 13:10:29
Last Modify:2022-05-23 09:15:29 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:htab_percpu_map_seq_show_elem

Proto:static void htab_percpu_map_seq_show_elem(struct bpf_map *map, void *key, struct seq_file *m)

Type:void

Parameter:

TypeParameterName
struct bpf_map *map
void *key
struct seq_file *m
1337  __percpu * pptr
1340  _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
1342  l = Called from syscall or from eBPF program directly, so* arguments have to match bpf_map_lookup_elem() exactly.* The return value is adjusted by BPF instructions* in htab_map_gen_lookup().
1343  If Not l Then
1344  _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()
1345  Return
1348  btf_type_seq_show(btf, btf_key_type_id, key, m)
1349  seq_puts(m, ": {\n")
1350  pptr = htab_elem_get_ptr(l, key_size)
1351  for_each_possible_cpu(cpu)
1352  seq_printf(m, "\tcpu%d: ", cpu)
1353  btf_type_seq_show(btf, btf_value_type_id, per_cpu_ptr(pptr, cpu), m)
1355  seq_puts(m, "\n")
1357  seq_puts(m, "}\n")
1359  _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()