cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

acct.h (2510B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 *  BSD Process Accounting for Linux - Definitions
      4 *
      5 *  Author: Marco van Wieringen (mvw@planets.elm.net)
      6 *
      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.
     11 *
     12 *  Copyright (C) 1995 - 1997 Marco van Wieringen - ELM Consultancy B.V.
     13 *
     14 */
     15#ifndef _LINUX_ACCT_H
     16#define _LINUX_ACCT_H
     17
     18#include <uapi/linux/acct.h>
     19
     20
     21
     22#ifdef CONFIG_BSD_PROCESS_ACCT
     23struct 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#else
     28#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#endif
     32
     33/*
     34 * ACCT_VERSION numbers as yet defined:
     35 * 0: old format (until 2.6.7) with 16 bit uid/gid
     36 * 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_VERSION
     45#undef AHZ
     46
     47#ifdef CONFIG_BSD_PROCESS_ACCT_V3
     48#define ACCT_VERSION	3
     49#define AHZ		100
     50typedef struct acct_v3 acct_t;
     51#else
     52#ifdef CONFIG_M68K
     53#define ACCT_VERSION	1
     54#else
     55#define ACCT_VERSION	2
     56#endif
     57#define AHZ		(USER_HZ)
     58typedef struct acct acct_t;
     59#endif
     60
     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)) == 0
     70# if HZ < AHZ
     71	return x * (AHZ / HZ);
     72# else
     73	return x / (HZ / AHZ);
     74# endif
     75#else
     76        u64 tmp = (u64)x * TICK_NSEC;
     77        do_div(tmp, (NSEC_PER_SEC / AHZ));
     78        return (long)tmp;
     79#endif
     80}
     81
     82static inline u64 nsec_to_AHZ(u64 x)
     83{
     84#if (NSEC_PER_SEC % AHZ) == 0
     85	do_div(x, (NSEC_PER_SEC / AHZ));
     86#elif (AHZ % 512) == 0
     87	x *= AHZ/512;
     88	do_div(x, (NSEC_PER_SEC / 512));
     89#else
     90	/*
     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#endif
     99	return x;
    100}
    101
    102#endif	/* _LINUX_ACCT_H */