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103 lines
2.5 KiB
103 lines
2.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* BSD Process Accounting for Linux - Definitions |
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* |
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* Author: Marco van Wieringen ([email protected]) |
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* |
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* This header file contains the definitions needed to implement |
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* BSD-style process accounting. The kernel accounting code and all |
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* user-level programs that try to do something useful with the |
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* process accounting log must include this file. |
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* |
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* Copyright (C) 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V. |
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* |
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*/ |
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#ifndef _LINUX_ACCT_H |
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#define _LINUX_ACCT_H |
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#include <uapi/linux/acct.h> |
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#ifdef CONFIG_BSD_PROCESS_ACCT |
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struct pid_namespace; |
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extern int acct_parm[]; /* for sysctl */ |
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extern void acct_collect(long exitcode, int group_dead); |
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extern void acct_process(void); |
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extern void acct_exit_ns(struct pid_namespace *); |
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#else |
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#define acct_collect(x,y) do { } while (0) |
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#define acct_process() do { } while (0) |
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#define acct_exit_ns(ns) do { } while (0) |
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#endif |
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/* |
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* ACCT_VERSION numbers as yet defined: |
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* 0: old format (until 2.6.7) with 16 bit uid/gid |
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* 1: extended variant (binary compatible on M68K) |
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* 2: extended variant (binary compatible on everything except M68K) |
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* 3: new binary incompatible format (64 bytes) |
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* 4: new binary incompatible format (128 bytes) |
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* 5: new binary incompatible format (128 bytes, second half) |
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* |
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*/ |
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#undef ACCT_VERSION |
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#undef AHZ |
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#ifdef CONFIG_BSD_PROCESS_ACCT_V3 |
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#define ACCT_VERSION 3 |
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#define AHZ 100 |
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typedef struct acct_v3 acct_t; |
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#else |
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#ifdef CONFIG_M68K |
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#define ACCT_VERSION 1 |
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#else |
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#define ACCT_VERSION 2 |
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#endif |
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#define AHZ (USER_HZ) |
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typedef struct acct acct_t; |
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#endif |
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#include <linux/jiffies.h> |
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/* |
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* Yet another set of HZ to *HZ helper functions. |
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* See <linux/jiffies.h> for the original. |
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*/ |
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static inline u32 jiffies_to_AHZ(unsigned long x) |
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{ |
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#if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0 |
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# if HZ < AHZ |
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return x * (AHZ / HZ); |
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# else |
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return x / (HZ / AHZ); |
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# endif |
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#else |
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u64 tmp = (u64)x * TICK_NSEC; |
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do_div(tmp, (NSEC_PER_SEC / AHZ)); |
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return (long)tmp; |
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#endif |
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} |
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static inline u64 nsec_to_AHZ(u64 x) |
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{ |
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#if (NSEC_PER_SEC % AHZ) == 0 |
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do_div(x, (NSEC_PER_SEC / AHZ)); |
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#elif (AHZ % 512) == 0 |
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x *= AHZ/512; |
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do_div(x, (NSEC_PER_SEC / 512)); |
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#else |
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/* |
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* max relative error 5.7e-8 (1.8s per year) for AHZ <= 1024, |
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* overflow after 64.99 years. |
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* exact for AHZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ... |
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*/ |
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x *= 9; |
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do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (AHZ/2)) |
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/ AHZ)); |
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#endif |
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return x; |
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} |
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#endif /* _LINUX_ACCT_H */
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