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 */
104