cputime.h 3.46 KB
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/*
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 * Definitions for measuring cputime on ia64 machines.
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 *
 * Based on <asm-powerpc/cputime.h>.
 *
 * Copyright (C) 2007 FUJITSU LIMITED
 * Copyright (C) 2007 Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *
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 * If we have CONFIG_VIRT_CPU_ACCOUNTING_NATIVE, we measure cpu time in nsec.
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 * Otherwise we measure cpu time in jiffies using the generic definitions.
 */

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#ifndef __IA64_CPUTIME_H
#define __IA64_CPUTIME_H

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#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
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# include <asm-generic/cputime.h>
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#else
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#include <asm/processor.h>
#include <linux/math64.h>

typedef u64 __nocast cputime_t;
typedef u64 __nocast cputime64_t;

#define cmpxchg_cputime(ptr, old, new) cmpxchg64(ptr, old, new)

#define cputime_one_jiffy		jiffies_to_cputime(1)

#define cputime_div(__ct, divisor)  div_u64((__force u64)__ct, divisor)
#define cputime_div_rem(__ct, divisor, remainder) \
	div_u64_rem((__force u64)__ct, divisor, remainder);

/*
 * Convert cputime <-> jiffies (HZ)
 */
#define cputime_to_jiffies(__ct)	\
	cputime_div(__ct, NSEC_PER_SEC / HZ)
#define jiffies_to_cputime(__jif)	\
	(__force cputime_t)((__jif) * (NSEC_PER_SEC / HZ))
#define cputime64_to_jiffies64(__ct)	\
	cputime_div(__ct, NSEC_PER_SEC / HZ)
#define jiffies64_to_cputime64(__jif)	\
	(__force cputime64_t)((__jif) * (NSEC_PER_SEC / HZ))


/*
 * Convert cputime <-> nanoseconds
 */
#define cputime_to_nsecs(__ct)		\
	(__force u64)(__ct)
#define nsecs_to_cputime(__nsecs)	\
	(__force cputime_t)(__nsecs)
#define nsecs_to_cputime64(__nsecs)	\
	(__force cputime64_t)(__nsecs)


/*
 * Convert cputime <-> microseconds
 */
#define cputime_to_usecs(__ct)		\
	cputime_div(__ct, NSEC_PER_USEC)
#define usecs_to_cputime(__usecs)	\
	(__force cputime_t)((__usecs) * NSEC_PER_USEC)
#define usecs_to_cputime64(__usecs)	\
	(__force cputime64_t)((__usecs) * NSEC_PER_USEC)

/*
 * Convert cputime <-> seconds
 */
#define cputime_to_secs(__ct)		\
	cputime_div(__ct, NSEC_PER_SEC)
#define secs_to_cputime(__secs)		\
	(__force cputime_t)((__secs) * NSEC_PER_SEC)

/*
 * Convert cputime <-> timespec (nsec)
 */
static inline cputime_t timespec_to_cputime(const struct timespec *val)
{
	u64 ret = (u64)val->tv_sec * NSEC_PER_SEC + val->tv_nsec;
	return (__force cputime_t) ret;
}
static inline void cputime_to_timespec(const cputime_t ct, struct timespec *val)
{
	u32 rem;

	val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
	val->tv_nsec = rem;
}

/*
 * Convert cputime <-> timeval (msec)
 */
static inline cputime_t timeval_to_cputime(const struct timeval *val)
{
	u64 ret = (u64)val->tv_sec * NSEC_PER_SEC +
			val->tv_usec * NSEC_PER_USEC;
	return (__force cputime_t) ret;
}
static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val)
{
	u32 rem;

	val->tv_sec = cputime_div_rem(ct, NSEC_PER_SEC, &rem);
	val->tv_usec = rem / NSEC_PER_USEC;
}

/*
 * Convert cputime <-> clock (USER_HZ)
 */
#define cputime_to_clock_t(__ct)	\
	cputime_div(__ct, (NSEC_PER_SEC / USER_HZ))
#define clock_t_to_cputime(__x)		\
	(__force cputime_t)((__x) * (NSEC_PER_SEC / USER_HZ))

/*
 * Convert cputime64 to clock.
 */
#define cputime64_to_clock_t(__ct)	\
	cputime_to_clock_t((__force cputime_t)__ct)


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extern void arch_vtime_task_switch(struct task_struct *tsk);
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#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
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#endif /* __IA64_CPUTIME_H */