include/linux/acct.h

   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
  22 struct vfsmount;
  23 struct super_block;
  24 struct pacct_struct;
  25 struct pid_namespace;
  26 extern int acct_parm[]; /* for sysctl */
  27 extern void acct_collect(long exitcode, int group_dead);
  28 extern void acct_process(void);
  29 extern void acct_exit_ns(struct pid_namespace *);
  30 #else
  31 #define acct_collect(x,y)       do { } while (0)
  32 #define acct_process()          do { } while (0)
  33 #define acct_exit_ns(ns)        do { } while (0)
  34 #endif
  35 extern void acct_auto_close(struct hlist_head *);
  36 extern void acct_auto_close_mnt(struct hlist_head *);
  37
  38 /*
  39  * ACCT_VERSION numbers as yet defined:
  40  * 0: old format (until 2.6.7) with 16 bit uid/gid
  41  * 1: extended variant (binary compatible on M68K)
  42  * 2: extended variant (binary compatible on everything except M68K)
  43  * 3: new binary incompatible format (64 bytes)
  44  * 4: new binary incompatible format (128 bytes)
  45  * 5: new binary incompatible format (128 bytes, second half)
  46  *
  47  */
  48
  49 #undef ACCT_VERSION
  50 #undef AHZ
  51
  52 #ifdef CONFIG_BSD_PROCESS_ACCT_V3
  53 #define ACCT_VERSION    3
  54 #define AHZ             100
  55 typedef struct acct_v3 acct_t;
  56 #else
  57 #ifdef CONFIG_M68K
  58 #define ACCT_VERSION    1
  59 #else
  60 #define ACCT_VERSION    2
  61 #endif
  62 #define AHZ             (USER_HZ)
  63 typedef struct acct acct_t;
  64 #endif
  65
  66 #include <linux/jiffies.h>
  67 /*
  68  * Yet another set of HZ to *HZ helper functions.
  69  * See <linux/jiffies.h> for the original.
  70  */
  71
  72 static inline u32 jiffies_to_AHZ(unsigned long x)
  73 {
  74 #if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0
  75 # if HZ < AHZ
  76         return x * (AHZ / HZ);
  77 # else
  78         return x / (HZ / AHZ);
  79 # endif
  80 #else
  81         u64 tmp = (u64)x * TICK_NSEC;
  82         do_div(tmp, (NSEC_PER_SEC / AHZ));
  83         return (long)tmp;
  84 #endif
  85 }
  86
  87 static inline u64 nsec_to_AHZ(u64 x)
  88 {
  89 #if (NSEC_PER_SEC % AHZ) == 0
  90         do_div(x, (NSEC_PER_SEC / AHZ));
  91 #elif (AHZ % 512) == 0
  92         x *= AHZ/512;
  93         do_div(x, (NSEC_PER_SEC / 512));
  94 #else
  95         /*
  96          * max relative error 5.7e-8 (1.8s per year) for AHZ <= 1024,
  97          * overflow after 64.99 years.
  98          * exact for AHZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
  99          */
 100         x *= 9;
 101         do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (AHZ/2))
 102                                   / AHZ));
 103 #endif
 104         return x;
 105 }
 106
 107 #endif  /* _LINUX_ACCT_H */