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1 /* SPDX-License-Identifier: GPL-2.0 */
3 * BSD Process Accounting for Linux - Definitions
5 * Author: Marco van Wieringen (mvw@planets.elm.net)
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.
12 * Copyright (C) 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V.
18 #include <uapi/linux/acct.h>
22 #ifdef CONFIG_BSD_PROCESS_ACCT
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
*);
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)
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)
51 #ifdef CONFIG_BSD_PROCESS_ACCT_V3
52 #define ACCT_VERSION 3
54 typedef struct acct_v3 acct_t
;
57 #define ACCT_VERSION 1
59 #define ACCT_VERSION 2
62 typedef struct acct acct_t
;
65 #include <linux/jiffies.h>
67 * Yet another set of HZ to *HZ helper functions.
68 * See <linux/jiffies.h> for the original.
71 static inline u32
jiffies_to_AHZ(unsigned long x
)
73 #if (TICK_NSEC % (NSEC_PER_SEC / AHZ)) == 0
75 return x
* (AHZ
/ HZ
);
77 return x
/ (HZ
/ AHZ
);
80 u64 tmp
= (u64
)x
* TICK_NSEC
;
81 do_div(tmp
, (NSEC_PER_SEC
/ AHZ
));
86 static inline u64
nsec_to_AHZ(u64 x
)
88 #if (NSEC_PER_SEC % AHZ) == 0
89 do_div(x
, (NSEC_PER_SEC
/ AHZ
));
90 #elif (AHZ % 512) == 0
92 do_div(x
, (NSEC_PER_SEC
/ 512));
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, ...
100 do_div(x
, (unsigned long)((9ull * NSEC_PER_SEC
+ (AHZ
/2))
106 #endif /* _LINUX_ACCT_H */