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