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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
18#include <uapi/linux/acct.h>
19
20
21
22#ifdef CONFIG_BSD_PROCESS_ACCT
23struct pid_namespace;
24extern int acct_parm[]; /* for sysctl */
25extern void acct_collect(long exitcode, int group_dead);
26extern void acct_process(void);
27extern void acct_exit_ns(struct pid_namespace *);
28#else
29#define acct_collect(x,y) do { } while (0)
30#define acct_process() do { } while (0)
31#define acct_exit_ns(ns) do { } while (0)
32#endif
33
34/*
35 * ACCT_VERSION numbers as yet defined:
36 * 0: old format (until 2.6.7) with 16 bit uid/gid
37 * 1: extended variant (binary compatible on M68K)
38 * 2: extended variant (binary compatible on everything except M68K)
39 * 3: new binary incompatible format (64 bytes)
40 * 4: new binary incompatible format (128 bytes)
41 * 5: new binary incompatible format (128 bytes, second half)
42 *
43 */
44
45#undef ACCT_VERSION
46#undef AHZ
47
48#ifdef CONFIG_BSD_PROCESS_ACCT_V3
49#define ACCT_VERSION 3
50#define AHZ 100
51typedef struct acct_v3 acct_t;
52#else
53#ifdef CONFIG_M68K
54#define ACCT_VERSION 1
55#else
56#define ACCT_VERSION 2
57#endif
58#define AHZ (USER_HZ)
59typedef struct acct acct_t;
60#endif
61
62#include <linux/jiffies.h>
63/*
64 * Yet another set of HZ to *HZ helper functions.
65 * See <linux/jiffies.h> for the original.
66 */
67
68static inline u32 jiffies_to_AHZ(unsigned long x)
69{
70#if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0
71# if HZ < AHZ
72 return x * (AHZ / HZ);
73# else
74 return x / (HZ / AHZ);
75# endif
76#else
77 u64 tmp = (u64)x * TICK_NSEC;
78 do_div(tmp, (NSEC_PER_SEC / AHZ));
79 return (long)tmp;
80#endif
81}
82
83static inline u64 nsec_to_AHZ(u64 x)
84{
85#if (NSEC_PER_SEC % AHZ) == 0
86 do_div(x, (NSEC_PER_SEC / AHZ));
87#elif (AHZ % 512) == 0
88 x *= AHZ/512;
89 do_div(x, (NSEC_PER_SEC / 512));
90#else
91 /*
92 * max relative error 5.7e-8 (1.8s per year) for AHZ <= 1024,
93 * overflow after 64.99 years.
94 * exact for AHZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
95 */
96 x *= 9;
97 do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (AHZ/2))
98 / AHZ));
99#endif
100 return x;
101}
102
103#endif /* _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
22struct vfsmount;
23struct super_block;
24struct pacct_struct;
25struct pid_namespace;
26extern int acct_parm[]; /* for sysctl */
27extern void acct_collect(long exitcode, int group_dead);
28extern void acct_process(void);
29extern 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
36/*
37 * ACCT_VERSION numbers as yet defined:
38 * 0: old format (until 2.6.7) with 16 bit uid/gid
39 * 1: extended variant (binary compatible on M68K)
40 * 2: extended variant (binary compatible on everything except M68K)
41 * 3: new binary incompatible format (64 bytes)
42 * 4: new binary incompatible format (128 bytes)
43 * 5: new binary incompatible format (128 bytes, second half)
44 *
45 */
46
47#undef ACCT_VERSION
48#undef AHZ
49
50#ifdef CONFIG_BSD_PROCESS_ACCT_V3
51#define ACCT_VERSION 3
52#define AHZ 100
53typedef struct acct_v3 acct_t;
54#else
55#ifdef CONFIG_M68K
56#define ACCT_VERSION 1
57#else
58#define ACCT_VERSION 2
59#endif
60#define AHZ (USER_HZ)
61typedef struct acct acct_t;
62#endif
63
64#include <linux/jiffies.h>
65/*
66 * Yet another set of HZ to *HZ helper functions.
67 * See <linux/jiffies.h> for the original.
68 */
69
70static inline u32 jiffies_to_AHZ(unsigned long x)
71{
72#if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0
73# if HZ < AHZ
74 return x * (AHZ / HZ);
75# else
76 return x / (HZ / AHZ);
77# endif
78#else
79 u64 tmp = (u64)x * TICK_NSEC;
80 do_div(tmp, (NSEC_PER_SEC / AHZ));
81 return (long)tmp;
82#endif
83}
84
85static inline u64 nsec_to_AHZ(u64 x)
86{
87#if (NSEC_PER_SEC % AHZ) == 0
88 do_div(x, (NSEC_PER_SEC / AHZ));
89#elif (AHZ % 512) == 0
90 x *= AHZ/512;
91 do_div(x, (NSEC_PER_SEC / 512));
92#else
93 /*
94 * max relative error 5.7e-8 (1.8s per year) for AHZ <= 1024,
95 * overflow after 64.99 years.
96 * exact for AHZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
97 */
98 x *= 9;
99 do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (AHZ/2))
100 / AHZ));
101#endif
102 return x;
103}
104
105#endif /* _LINUX_ACCT_H */