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- /* Copyright (c) 2016, Facebook
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- */
- #include <linux/skbuff.h>
- #include <linux/netdevice.h>
- #include <linux/version.h>
- #include <uapi/linux/bpf.h>
- #include <uapi/linux/perf_event.h>
- #include <bpf/bpf_helpers.h>
- #include <bpf/bpf_tracing.h>
- struct {
- __uint(type, BPF_MAP_TYPE_HASH);
- __type(key, long);
- __type(value, long);
- __uint(max_entries, 1024);
- } my_map SEC(".maps");
- struct {
- __uint(type, BPF_MAP_TYPE_PERCPU_HASH);
- __uint(key_size, sizeof(long));
- __uint(value_size, sizeof(long));
- __uint(max_entries, 1024);
- } my_map2 SEC(".maps");
- struct {
- __uint(type, BPF_MAP_TYPE_STACK_TRACE);
- __uint(key_size, sizeof(u32));
- __uint(value_size, PERF_MAX_STACK_DEPTH * sizeof(u64));
- __uint(max_entries, 10000);
- } stackmap SEC(".maps");
- #define PROG(foo) \
- int foo(struct pt_regs *ctx) \
- { \
- long v = PT_REGS_IP(ctx), *val; \
- \
- val = bpf_map_lookup_elem(&my_map, &v); \
- bpf_map_update_elem(&my_map, &v, &v, BPF_ANY); \
- bpf_map_update_elem(&my_map2, &v, &v, BPF_ANY); \
- bpf_map_delete_elem(&my_map2, &v); \
- bpf_get_stackid(ctx, &stackmap, BPF_F_REUSE_STACKID); \
- return 0; \
- }
- /* add kprobes to all possible *spin* functions */
- SEC("kprobe/spin_unlock")PROG(p1)
- SEC("kprobe/spin_lock")PROG(p2)
- SEC("kprobe/mutex_spin_on_owner")PROG(p3)
- SEC("kprobe/rwsem_spin_on_owner")PROG(p4)
- SEC("kprobe/spin_unlock_irqrestore")PROG(p5)
- SEC("kprobe/_raw_spin_unlock_irqrestore")PROG(p6)
- SEC("kprobe/_raw_spin_unlock_bh")PROG(p7)
- SEC("kprobe/_raw_spin_unlock")PROG(p8)
- SEC("kprobe/_raw_spin_lock_irqsave")PROG(p9)
- SEC("kprobe/_raw_spin_trylock_bh")PROG(p10)
- SEC("kprobe/_raw_spin_lock_irq")PROG(p11)
- SEC("kprobe/_raw_spin_trylock")PROG(p12)
- SEC("kprobe/_raw_spin_lock")PROG(p13)
- SEC("kprobe/_raw_spin_lock_bh")PROG(p14)
- /* and to inner bpf helpers */
- SEC("kprobe/htab_map_update_elem")PROG(p15)
- SEC("kprobe/__htab_percpu_map_update_elem")PROG(p16)
- SEC("kprobe/htab_map_alloc")PROG(p17)
- char _license[] SEC("license") = "GPL";
- u32 _version SEC("version") = LINUX_VERSION_CODE;
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