cregit-Linux how code gets into the kernel

Release 4.12 include/linux/acct.h

Directory: include/linux
/*
 *  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 vfsmount;
struct super_block;
struct pacct_struct;
struct pid_namespace;
extern int acct_parm[]; /* for sysctl */
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 }

Contributors

PersonTokensPropCommitsCommitProp
Tim Schmielau6478.05%266.67%
David Fries1821.95%133.33%
Total82100.00%3100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
Tim Schmielau93100.00%2100.00%
Total93100.00%2100.00%

#endif /* _LINUX_ACCT_H */

Overall Contributors

PersonTokensPropCommitsCommitProp
Tim Schmielau20364.24%317.65%
Linus Torvalds (pre-git)299.18%317.65%
KaiGai Kohei226.96%211.76%
Pavel Emelyanov196.01%15.88%
David Fries185.70%15.88%
Al Viro92.85%317.65%
David Howells72.22%211.76%
Dave Young61.90%15.88%
David Woodhouse30.95%15.88%
Total316100.00%17100.00%
Directory: include/linux
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