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 int acct_parm[]; /* for sysctl */ 25 extern void acct_collect(long exitcode, int group_dead); 26 extern void acct_process(void); 27 extern 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 51 typedef 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) 59 typedef 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 68 static 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 83 static 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