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Diffstat (limited to 'include/linux/acct.h')
| -rw-r--r-- | include/linux/acct.h | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/include/linux/acct.h b/include/linux/acct.h new file mode 100644 index 000000000..2718c4854 --- /dev/null +++ b/include/linux/acct.h @@ -0,0 +1,102 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * BSD Process Accounting for Linux - Definitions + * + * Author: Marco van Wieringen (mvw@planets.elm.net) + * + * This header file contains the definitions needed to implement + * BSD-style process accounting. The kernel accounting code and all + * user-level programs that try to do something useful with the + * process accounting log must include this file. + * + * Copyright (C) 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V. + * + */ +#ifndef _LINUX_ACCT_H +#define _LINUX_ACCT_H + +#include <uapi/linux/acct.h> + + + +#ifdef CONFIG_BSD_PROCESS_ACCT +struct pid_namespace; +extern void acct_collect(long exitcode, int group_dead); +extern void acct_process(void); +extern void acct_exit_ns(struct pid_namespace *); +#else +#define acct_collect(x,y) do { } while (0) +#define acct_process() do { } while (0) +#define acct_exit_ns(ns) do { } while (0) +#endif + +/* + * ACCT_VERSION numbers as yet defined: + * 0: old format (until 2.6.7) with 16 bit uid/gid + * 1: extended variant (binary compatible on M68K) + * 2: extended variant (binary compatible on everything except M68K) + * 3: new binary incompatible format (64 bytes) + * 4: new binary incompatible format (128 bytes) + * 5: new binary incompatible format (128 bytes, second half) + * + */ + +#undef ACCT_VERSION +#undef AHZ + +#ifdef CONFIG_BSD_PROCESS_ACCT_V3 +#define ACCT_VERSION 3 +#define AHZ 100 +typedef struct acct_v3 acct_t; +#else +#ifdef CONFIG_M68K +#define ACCT_VERSION 1 +#else +#define ACCT_VERSION 2 +#endif +#define AHZ (USER_HZ) +typedef struct acct acct_t; +#endif + +#include <linux/jiffies.h> +/* + * Yet another set of HZ to *HZ helper functions. + * See <linux/jiffies.h> for the original. + */ + +static inline u32 jiffies_to_AHZ(unsigned long x) +{ +#if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0 +# if HZ < AHZ + return x * (AHZ / HZ); +# else + return x / (HZ / AHZ); +# endif +#else + u64 tmp = (u64)x * TICK_NSEC; + do_div(tmp, (NSEC_PER_SEC / AHZ)); + return (long)tmp; +#endif +} + +static inline u64 nsec_to_AHZ(u64 x) +{ +#if (NSEC_PER_SEC % AHZ) == 0 + do_div(x, (NSEC_PER_SEC / AHZ)); +#elif (AHZ % 512) == 0 + x *= AHZ/512; + do_div(x, (NSEC_PER_SEC / 512)); +#else + /* + * max relative error 5.7e-8 (1.8s per year) for AHZ <= 1024, + * overflow after 64.99 years. + * exact for AHZ=60, 72, 90, 120, 144, 180, 300, 600, 900, ... + */ + x *= 9; + do_div(x, (unsigned long)((9ull * NSEC_PER_SEC + (AHZ/2)) + / AHZ)); +#endif + return x; +} + +#endif /* _LINUX_ACCT_H */ |