spintest_kern.c 2.1 KB

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  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. struct {
  15. __uint(type, BPF_MAP_TYPE_HASH);
  16. __type(key, long);
  17. __type(value, long);
  18. __uint(max_entries, 1024);
  19. } my_map SEC(".maps");
  20. struct {
  21. __uint(type, BPF_MAP_TYPE_PERCPU_HASH);
  22. __uint(key_size, sizeof(long));
  23. __uint(value_size, sizeof(long));
  24. __uint(max_entries, 1024);
  25. } my_map2 SEC(".maps");
  26. struct {
  27. __uint(type, BPF_MAP_TYPE_STACK_TRACE);
  28. __uint(key_size, sizeof(u32));
  29. __uint(value_size, PERF_MAX_STACK_DEPTH * sizeof(u64));
  30. __uint(max_entries, 10000);
  31. } stackmap SEC(".maps");
  32. #define PROG(foo) \
  33. int foo(struct pt_regs *ctx) \
  34. { \
  35. long v = PT_REGS_IP(ctx), *val; \
  36. \
  37. val = bpf_map_lookup_elem(&my_map, &v); \
  38. bpf_map_update_elem(&my_map, &v, &v, BPF_ANY); \
  39. bpf_map_update_elem(&my_map2, &v, &v, BPF_ANY); \
  40. bpf_map_delete_elem(&my_map2, &v); \
  41. bpf_get_stackid(ctx, &stackmap, BPF_F_REUSE_STACKID); \
  42. return 0; \
  43. }
  44. /* add kprobes to all possible *spin* functions */
  45. SEC("kprobe/spin_unlock")PROG(p1)
  46. SEC("kprobe/spin_lock")PROG(p2)
  47. SEC("kprobe/mutex_spin_on_owner")PROG(p3)
  48. SEC("kprobe/rwsem_spin_on_owner")PROG(p4)
  49. SEC("kprobe/spin_unlock_irqrestore")PROG(p5)
  50. SEC("kprobe/_raw_spin_unlock_irqrestore")PROG(p6)
  51. SEC("kprobe/_raw_spin_unlock_bh")PROG(p7)
  52. SEC("kprobe/_raw_spin_unlock")PROG(p8)
  53. SEC("kprobe/_raw_spin_lock_irqsave")PROG(p9)
  54. SEC("kprobe/_raw_spin_trylock_bh")PROG(p10)
  55. SEC("kprobe/_raw_spin_lock_irq")PROG(p11)
  56. SEC("kprobe/_raw_spin_trylock")PROG(p12)
  57. SEC("kprobe/_raw_spin_lock")PROG(p13)
  58. SEC("kprobe/_raw_spin_lock_bh")PROG(p14)
  59. /* and to inner bpf helpers */
  60. SEC("kprobe/htab_map_update_elem")PROG(p15)
  61. SEC("kprobe/__htab_percpu_map_update_elem")PROG(p16)
  62. SEC("kprobe/htab_map_alloc")PROG(p17)
  63. char _license[] SEC("license") = "GPL";
  64. u32 _version SEC("version") = LINUX_VERSION_CODE;