103 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * BSD Process Accounting for Linux - Definitions4 *5 * Author: Marco van Wieringen (mvw@planets.elm.net)6 *7 * This header file contains the definitions needed to implement8 * BSD-style process accounting. The kernel accounting code and all9 * user-level programs that try to do something useful with the10 * 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_H16#define _LINUX_ACCT_H17 18#include <uapi/linux/acct.h>19 20 21 22#ifdef CONFIG_BSD_PROCESS_ACCT23struct pid_namespace;24extern void acct_collect(long exitcode, int group_dead);25extern void acct_process(void);26extern void acct_exit_ns(struct pid_namespace *);27#else28#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#endif32 33/*34 * ACCT_VERSION numbers as yet defined:35 * 0: old format (until 2.6.7) with 16 bit uid/gid36 * 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_VERSION45#undef AHZ46 47#ifdef CONFIG_BSD_PROCESS_ACCT_V348#define ACCT_VERSION 349#define AHZ 10050typedef struct acct_v3 acct_t;51#else52#ifdef CONFIG_M68K53#define ACCT_VERSION 154#else55#define ACCT_VERSION 256#endif57#define AHZ (USER_HZ)58typedef struct acct acct_t;59#endif60 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 67static inline u32 jiffies_to_AHZ(unsigned long x)68{69#if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 070# if HZ < AHZ71 return x * (AHZ / HZ);72# else73 return x / (HZ / AHZ);74# endif75#else76 u64 tmp = (u64)x * TICK_NSEC;77 do_div(tmp, (NSEC_PER_SEC / AHZ));78 return (long)tmp;79#endif80}81 82static inline u64 nsec_to_AHZ(u64 x)83{84#if (NSEC_PER_SEC % AHZ) == 085 do_div(x, (NSEC_PER_SEC / AHZ));86#elif (AHZ % 512) == 087 x *= AHZ/512;88 do_div(x, (NSEC_PER_SEC / 512));89#else90 /*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#endif99 return x;100}101 102#endif /* _LINUX_ACCT_H */103