1 /* SPDX-License-Identifier: GPL-2.0 */
3 * BSD Process Accounting for Linux - Definitions
5 * Author: Marco van Wieringen (mvw@planets.elm.net)
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.
12 * Copyright (C) 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V.
18 #include <uapi/linux/acct.h>
22 #ifdef CONFIG_BSD_PROCESS_ACCT
24 extern void acct_collect(long exitcode, int group_dead);
25 extern void acct_process(void);
26 extern void acct_exit_ns(struct pid_namespace *);
28 #define acct_collect(x,y) do { } while (0)
29 #define acct_process() do { } while (0)
30 #define acct_exit_ns(ns) do { } while (0)
34 * ACCT_VERSION numbers as yet defined:
35 * 0: old format (until 2.6.7) with 16 bit uid/gid
36 * 1: extended variant (binary compatible on M68K)
37 * 2: extended variant (binary compatible on everything except M68K)
38 * 3: new binary incompatible format (64 bytes)
39 * 4: new binary incompatible format (128 bytes)
40 * 5: new binary incompatible format (128 bytes, second half)
47 #ifdef CONFIG_BSD_PROCESS_ACCT_V3
48 #define ACCT_VERSION 3
50 typedef struct acct_v3 acct_t;
53 #define ACCT_VERSION 1
55 #define ACCT_VERSION 2
58 typedef struct acct acct_t;
61 #include <linux/jiffies.h>
63 * Yet another set of HZ to *HZ helper functions.
64 * See <linux/jiffies.h> for the original.
67 static inline u32 jiffies_to_AHZ(unsigned long x)
69 #if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0
71 return x * (AHZ / HZ);
73 return x / (HZ / AHZ);
76 u64 tmp = (u64)x * TICK_NSEC;
77 do_div(tmp, (NSEC_PER_SEC / AHZ));
82 static inline u64 nsec_to_AHZ(u64 x)
84 #if (NSEC_PER_SEC % AHZ) == 0
85 do_div(x, (NSEC_PER_SEC / AHZ));
86 #elif (AHZ % 512) == 0
88 do_div(x, (NSEC_PER_SEC / 512));
91 * max relative error 5.7e-8 (1.8s per year) for AHZ <= 1024,
92 * overflow after 64.99 years.
93 * exact for AHZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ...
96 do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (AHZ/2))
102 #endif /* _LINUX_ACCT_H */