67 lines
1.3 KiB
C
67 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2022 Google */
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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struct bpf_testmod_btf_type_tag_1 {
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int a;
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};
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struct bpf_testmod_btf_type_tag_2 {
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struct bpf_testmod_btf_type_tag_1 *p;
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};
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__u64 g;
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SEC("fentry/bpf_testmod_test_btf_type_tag_percpu_1")
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int BPF_PROG(test_percpu1, struct bpf_testmod_btf_type_tag_1 *arg)
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{
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g = arg->a;
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return 0;
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}
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SEC("fentry/bpf_testmod_test_btf_type_tag_percpu_2")
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int BPF_PROG(test_percpu2, struct bpf_testmod_btf_type_tag_2 *arg)
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{
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g = arg->p->a;
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return 0;
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}
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/* trace_cgroup_mkdir(struct cgroup *cgrp, const char *path)
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*
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* struct cgroup_rstat_cpu {
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* ...
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* struct cgroup *updated_children;
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* ...
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* };
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*
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* struct cgroup {
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* ...
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* struct cgroup_rstat_cpu __percpu *rstat_cpu;
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* ...
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* };
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*/
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SEC("tp_btf/cgroup_mkdir")
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int BPF_PROG(test_percpu_load, struct cgroup *cgrp, const char *path)
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{
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g = (__u64)cgrp->rstat_cpu->updated_children;
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return 0;
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}
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SEC("tp_btf/cgroup_mkdir")
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int BPF_PROG(test_percpu_helper, struct cgroup *cgrp, const char *path)
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{
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struct cgroup_rstat_cpu *rstat;
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__u32 cpu;
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cpu = bpf_get_smp_processor_id();
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rstat = (struct cgroup_rstat_cpu *)bpf_per_cpu_ptr(cgrp->rstat_cpu, cpu);
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if (rstat) {
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/* READ_ONCE */
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*(volatile int *)rstat;
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}
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return 0;
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}
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