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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 |
| 23 | struct pid_namespace; |
| 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 *); |
| 27 | #else |
| 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) |
| 31 | #endif |
| 32 | |
| 33 | /* |
| 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) |
| 41 | * |
| 42 | */ |
| 43 | |
| 44 | #undef ACCT_VERSION |
| 45 | #undef AHZ |
| 46 | |
| 47 | #ifdef CONFIG_BSD_PROCESS_ACCT_V3 |
| 48 | #define ACCT_VERSION 3 |
| 49 | #define AHZ 100 |
| 50 | typedef struct acct_v3 acct_t; |
| 51 | #else |
| 52 | #ifdef CONFIG_M68K |
| 53 | #define ACCT_VERSION 1 |
| 54 | #else |
| 55 | #define ACCT_VERSION 2 |
| 56 | #endif |
| 57 | #define AHZ (USER_HZ) |
| 58 | typedef struct acct acct_t; |
| 59 | #endif |
| 60 | |
| 61 | #include <linux/jiffies.h> |
| 62 | /* |
| 63 | * Yet another set of HZ to *HZ helper functions. |
| 64 | * See <linux/jiffies.h> for the original. |
| 65 | */ |
| 66 | |
| 67 | static inline u32 jiffies_to_AHZ(unsigned long x) |
| 68 | { |
| 69 | #if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0 |
| 70 | # if HZ < AHZ |
| 71 | return x * (AHZ / HZ); |
| 72 | # else |
| 73 | return x / (HZ / AHZ); |
| 74 | # endif |
| 75 | #else |
| 76 | u64 tmp = (u64)x * TICK_NSEC; |
| 77 | do_div(tmp, (NSEC_PER_SEC / AHZ)); |
| 78 | return (long)tmp; |
| 79 | #endif |
| 80 | } |
| 81 | |
| 82 | static inline u64 nsec_to_AHZ(u64 x) |
| 83 | { |
| 84 | #if (NSEC_PER_SEC % AHZ) == 0 |
| 85 | do_div(x, (NSEC_PER_SEC / AHZ)); |
| 86 | #elif (AHZ % 512) == 0 |
| 87 | x *= AHZ/512; |
| 88 | do_div(x, (NSEC_PER_SEC / 512)); |
| 89 | #else |
| 90 | /* |
| 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, ... |
| 94 | */ |
| 95 | x *= 9; |
| 96 | do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (AHZ/2)) |
| 97 | / AHZ)); |
| 98 | #endif |
| 99 | return x; |
| 100 | } |
| 101 | |
| 102 | #endif /* _LINUX_ACCT_H */ |
| 103 |
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