/*
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* Definitions for measuring cputime on powerpc machines.
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*
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* Copyright (C) 2006 Paul Mackerras, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* If we have CONFIG_VIRT_CPU_ACCOUNTING_NATIVE, we measure cpu time in
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* the same units as the timebase. Otherwise we measure cpu time
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* in jiffies using the generic definitions.
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*/
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#ifndef __POWERPC_CPUTIME_H
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#define __POWERPC_CPUTIME_H
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#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
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#include <linux/types.h>
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#include <linux/time.h>
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#include <asm/div64.h>
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#include <asm/time.h>
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#include <asm/param.h>
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typedef u64 __nocast cputime_t;
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typedef u64 __nocast cputime64_t;
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#define cmpxchg_cputime(ptr, old, new) cmpxchg(ptr, old, new)
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#ifdef __KERNEL__
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/*
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* Convert cputime <-> microseconds
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*/
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extern u64 __cputime_usec_factor;
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static inline unsigned long cputime_to_usecs(const cputime_t ct)
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{
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return mulhdu((__force u64) ct, __cputime_usec_factor);
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}
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/*
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* PPC64 uses PACA which is task independent for storing accounting data while
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* PPC32 uses struct thread_info, therefore at task switch the accounting data
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* has to be populated in the new task
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*/
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#ifdef CONFIG_PPC64
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#define get_accounting(tsk) (&get_paca()->accounting)
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static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
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#else
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#define get_accounting(tsk) (&task_thread_info(tsk)->accounting)
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/*
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* Called from the context switch with interrupts disabled, to charge all
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* accumulated times to the current process, and to prepare accounting on
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* the next process.
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*/
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static inline void arch_vtime_task_switch(struct task_struct *prev)
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{
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struct cpu_accounting_data *acct = get_accounting(current);
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struct cpu_accounting_data *acct0 = get_accounting(prev);
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acct->starttime = acct0->starttime;
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acct->startspurr = acct0->startspurr;
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}
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#endif
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#endif /* __KERNEL__ */
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#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
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#endif /* __POWERPC_CPUTIME_H */
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