1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * BSD Process Accounting for Linux - Definitions 4 * 5 * Author: Marco van Wieringen ([email protected]) 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 vfsmount; 24 struct super_block; 25 struct pacct_struct; 26 struct pid_namespace; 27 extern int acct_parm[]; /* for sysctl */ 28 extern void acct_collect(long exitcode, int group_dead); 29 extern void acct_process(void); 30 extern 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 54 typedef 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) 62 typedef 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 71 static 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 86 static 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 */ 107