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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 */