acct.h 2.5 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. /*
  3. * BSD Process Accounting for Linux - Definitions
  4. *
  5. * Author: Marco van Wieringen (mvw@planets.elm.net)
  6. *
  7. * This header file contains the definitions needed to implement
  8. * BSD-style process accounting. The kernel accounting code and all
  9. * user-level programs that try to do something useful with the
  10. * process accounting log must include this file.
  11. *
  12. * Copyright (C) 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V.
  13. *
  14. */
  15. #ifndef _LINUX_ACCT_H
  16. #define _LINUX_ACCT_H
  17. #include <uapi/linux/acct.h>
  18. #ifdef CONFIG_BSD_PROCESS_ACCT
  19. struct pid_namespace;
  20. extern int acct_parm[]; /* for sysctl */
  21. extern void acct_collect(long exitcode, int group_dead);
  22. extern void acct_process(void);
  23. extern void acct_exit_ns(struct pid_namespace *);
  24. #else
  25. #define acct_collect(x,y) do { } while (0)
  26. #define acct_process() do { } while (0)
  27. #define acct_exit_ns(ns) do { } while (0)
  28. #endif
  29. /*
  30. * ACCT_VERSION numbers as yet defined:
  31. * 0: old format (until 2.6.7) with 16 bit uid/gid
  32. * 1: extended variant (binary compatible on M68K)
  33. * 2: extended variant (binary compatible on everything except M68K)
  34. * 3: new binary incompatible format (64 bytes)
  35. * 4: new binary incompatible format (128 bytes)
  36. * 5: new binary incompatible format (128 bytes, second half)
  37. *
  38. */
  39. #undef ACCT_VERSION
  40. #undef AHZ
  41. #ifdef CONFIG_BSD_PROCESS_ACCT_V3
  42. #define ACCT_VERSION 3
  43. #define AHZ 100
  44. typedef struct acct_v3 acct_t;
  45. #else
  46. #ifdef CONFIG_M68K
  47. #define ACCT_VERSION 1
  48. #else
  49. #define ACCT_VERSION 2
  50. #endif
  51. #define AHZ (USER_HZ)
  52. typedef struct acct acct_t;
  53. #endif
  54. #include <linux/jiffies.h>
  55. /*
  56. * Yet another set of HZ to *HZ helper functions.
  57. * See <linux/jiffies.h> for the original.
  58. */
  59. static inline u32 jiffies_to_AHZ(unsigned long x)
  60. {
  61. #if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0
  62. # if HZ < AHZ
  63. return x * (AHZ / HZ);
  64. # else
  65. return x / (HZ / AHZ);
  66. # endif
  67. #else
  68. u64 tmp = (u64)x * TICK_NSEC;
  69. do_div(tmp, (NSEC_PER_SEC / AHZ));
  70. return (long)tmp;
  71. #endif
  72. }
  73. static inline u64 nsec_to_AHZ(u64 x)
  74. {
  75. #if (NSEC_PER_SEC % AHZ) == 0
  76. do_div(x, (NSEC_PER_SEC / AHZ));
  77. #elif (AHZ % 512) == 0
  78. x *= AHZ/512;
  79. do_div(x, (NSEC_PER_SEC / 512));
  80. #else
  81. /*
  82. * max relative error 5.7e-8 (1.8s per year) for AHZ <= 1024,
  83. * overflow after 64.99 years.
  84. * exact for AHZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
  85. */
  86. x *= 9;
  87. do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (AHZ/2))
  88. / AHZ));
  89. #endif
  90. return x;
  91. }
  92. #endif /* _LINUX_ACCT_H */