spintest_kern.c (2166B)
1/* Copyright (c) 2016, Facebook 2 * 3 * This program is free software; you can redistribute it and/or 4 * modify it under the terms of version 2 of the GNU General Public 5 * License as published by the Free Software Foundation. 6 */ 7#include <linux/skbuff.h> 8#include <linux/netdevice.h> 9#include <linux/version.h> 10#include <uapi/linux/bpf.h> 11#include <uapi/linux/perf_event.h> 12#include <bpf/bpf_helpers.h> 13#include <bpf/bpf_tracing.h> 14 15struct { 16 __uint(type, BPF_MAP_TYPE_HASH); 17 __type(key, long); 18 __type(value, long); 19 __uint(max_entries, 1024); 20} my_map SEC(".maps"); 21struct { 22 __uint(type, BPF_MAP_TYPE_PERCPU_HASH); 23 __uint(key_size, sizeof(long)); 24 __uint(value_size, sizeof(long)); 25 __uint(max_entries, 1024); 26} my_map2 SEC(".maps"); 27 28struct { 29 __uint(type, BPF_MAP_TYPE_STACK_TRACE); 30 __uint(key_size, sizeof(u32)); 31 __uint(value_size, PERF_MAX_STACK_DEPTH * sizeof(u64)); 32 __uint(max_entries, 10000); 33} stackmap SEC(".maps"); 34 35#define PROG(foo) \ 36int foo(struct pt_regs *ctx) \ 37{ \ 38 long v = PT_REGS_IP(ctx), *val; \ 39\ 40 val = bpf_map_lookup_elem(&my_map, &v); \ 41 bpf_map_update_elem(&my_map, &v, &v, BPF_ANY); \ 42 bpf_map_update_elem(&my_map2, &v, &v, BPF_ANY); \ 43 bpf_map_delete_elem(&my_map2, &v); \ 44 bpf_get_stackid(ctx, &stackmap, BPF_F_REUSE_STACKID); \ 45 return 0; \ 46} 47 48/* add kprobes to all possible *spin* functions */ 49SEC("kprobe/spin_unlock")PROG(p1) 50SEC("kprobe/spin_lock")PROG(p2) 51SEC("kprobe/mutex_spin_on_owner")PROG(p3) 52SEC("kprobe/rwsem_spin_on_owner")PROG(p4) 53SEC("kprobe/spin_unlock_irqrestore")PROG(p5) 54SEC("kprobe/_raw_spin_unlock_irqrestore")PROG(p6) 55SEC("kprobe/_raw_spin_unlock_bh")PROG(p7) 56SEC("kprobe/_raw_spin_unlock")PROG(p8) 57SEC("kprobe/_raw_spin_lock_irqsave")PROG(p9) 58SEC("kprobe/_raw_spin_trylock_bh")PROG(p10) 59SEC("kprobe/_raw_spin_lock_irq")PROG(p11) 60SEC("kprobe/_raw_spin_trylock")PROG(p12) 61SEC("kprobe/_raw_spin_lock")PROG(p13) 62SEC("kprobe/_raw_spin_lock_bh")PROG(p14) 63/* and to inner bpf helpers */ 64SEC("kprobe/htab_map_update_elem")PROG(p15) 65SEC("kprobe/__htab_percpu_map_update_elem")PROG(p16) 66SEC("kprobe/htab_map_alloc")PROG(p17) 67 68char _license[] SEC("license") = "GPL"; 69u32 _version SEC("version") = LINUX_VERSION_CODE;