linux/include/linux/acct.h
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   1/*
   2 *  BSD Process Accounting for Linux - Definitions
   3 *
   4 *  Author: Marco van Wieringen (mvw@planets.elm.net)
   5 *
   6 *  This header file contains the definitions needed to implement
   7 *  BSD-style process accounting. The kernel accounting code and all
   8 *  user-level programs that try to do something useful with the
   9 *  process accounting log must include this file.
  10 *
  11 *  Copyright (C) 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V.
  12 *
  13 */
  14#ifndef _LINUX_ACCT_H
  15#define _LINUX_ACCT_H
  16
  17#include <uapi/linux/acct.h>
  18
  19
  20
  21#ifdef CONFIG_BSD_PROCESS_ACCT
  22struct vfsmount;
  23struct super_block;
  24struct pacct_struct;
  25struct pid_namespace;
  26extern int acct_parm[]; /* for sysctl */
  27extern void acct_auto_close_mnt(struct vfsmount *m);
  28extern void acct_auto_close(struct super_block *sb);
  29extern void acct_collect(long exitcode, int group_dead);
  30extern void acct_process(void);
  31extern void acct_exit_ns(struct pid_namespace *);
  32#else
  33#define acct_auto_close_mnt(x)  do { } while (0)
  34#define acct_auto_close(x)      do { } while (0)
  35#define acct_collect(x,y)       do { } while (0)
  36#define acct_process()          do { } while (0)
  37#define acct_exit_ns(ns)        do { } while (0)
  38#endif
  39
  40/*
  41 * ACCT_VERSION numbers as yet defined:
  42 * 0: old format (until 2.6.7) with 16 bit uid/gid
  43 * 1: extended variant (binary compatible on M68K)
  44 * 2: extended variant (binary compatible on everything except M68K)
  45 * 3: new binary incompatible format (64 bytes)
  46 * 4: new binary incompatible format (128 bytes)
  47 * 5: new binary incompatible format (128 bytes, second half)
  48 *
  49 */
  50
  51#undef ACCT_VERSION
  52#undef AHZ
  53
  54#ifdef CONFIG_BSD_PROCESS_ACCT_V3
  55#define ACCT_VERSION    3
  56#define AHZ             100
  57typedef struct acct_v3 acct_t;
  58#else
  59#ifdef CONFIG_M68K
  60#define ACCT_VERSION    1
  61#else
  62#define ACCT_VERSION    2
  63#endif
  64#define AHZ             (USER_HZ)
  65typedef struct acct acct_t;
  66#endif
  67
  68#include <linux/jiffies.h>
  69/*
  70 * Yet another set of HZ to *HZ helper functions.
  71 * See <linux/jiffies.h> for the original.
  72 */
  73
  74static inline u32 jiffies_to_AHZ(unsigned long x)
  75{
  76#if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0
  77# if HZ < AHZ
  78        return x * (AHZ / HZ);
  79# else
  80        return x / (HZ / AHZ);
  81# endif
  82#else
  83        u64 tmp = (u64)x * TICK_NSEC;
  84        do_div(tmp, (NSEC_PER_SEC / AHZ));
  85        return (long)tmp;
  86#endif
  87}
  88
  89static inline u64 nsec_to_AHZ(u64 x)
  90{
  91#if (NSEC_PER_SEC % AHZ) == 0
  92        do_div(x, (NSEC_PER_SEC / AHZ));
  93#elif (AHZ % 512) == 0
  94        x *= AHZ/512;
  95        do_div(x, (NSEC_PER_SEC / 512));
  96#else
  97        /*
  98         * max relative error 5.7e-8 (1.8s per year) for AHZ <= 1024,
  99         * overflow after 64.99 years.
 100         * exact for AHZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
 101         */
 102        x *= 9;
 103        do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (AHZ/2))
 104                                  / AHZ));
 105#endif
 106        return x;
 107}
 108
 109#endif  /* _LINUX_ACCT_H */
 110
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