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Linux kernel mirror (for testing)
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linux
1/*
2 * Definitions for measuring cputime on powerpc machines.
3 *
4 * Copyright (C) 2006 Paul Mackerras, IBM Corp.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 * If we have CONFIG_VIRT_CPU_ACCOUNTING_NATIVE, we measure cpu time in
12 * the same units as the timebase. Otherwise we measure cpu time
13 * in jiffies using the generic definitions.
14 */
15
16#ifndef __POWERPC_CPUTIME_H
17#define __POWERPC_CPUTIME_H
18
19#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
20
21#include <linux/types.h>
22#include <linux/time.h>
23#include <asm/div64.h>
24#include <asm/time.h>
25#include <asm/param.h>
26#include <asm/cpu_has_feature.h>
27
28typedef u64 __nocast cputime_t;
29typedef u64 __nocast cputime64_t;
30
31#define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new)
32
33#ifdef __KERNEL__
34/*
35 * Convert cputime <-> microseconds
36 */
37extern u64 __cputime_usec_factor;
38
39static inline unsigned long cputime_to_usecs(const cputime_t ct)
40{
41 return mulhdu((__force u64) ct, __cputime_usec_factor);
42}
43
44/*
45 * PPC64 uses PACA which is task independent for storing accounting data while
46 * PPC32 uses struct thread_info, therefore at task switch the accounting data
47 * has to be populated in the new task
48 */
49#ifdef CONFIG_PPC64
50#define get_accounting(tsk) (&get_paca()->accounting)
51static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
52#else
53#define get_accounting(tsk) (&task_thread_info(tsk)->accounting)
54/*
55 * Called from the context switch with interrupts disabled, to charge all
56 * accumulated times to the current process, and to prepare accounting on
57 * the next process.
58 */
59static inline void arch_vtime_task_switch(struct task_struct *prev)
60{
61 struct cpu_accounting_data *acct = get_accounting(current);
62 struct cpu_accounting_data *acct0 = get_accounting(prev);
63
64 acct->starttime = acct0->starttime;
65 acct->startspurr = acct0->startspurr;
66}
67#endif
68
69#endif /* __KERNEL__ */
70#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
71#endif /* __POWERPC_CPUTIME_H */