a42548a188
For powerpc with CONFIG_VIRT_CPU_ACCOUNTING jiffies_to_cputime(1) is not compile time constant and run time calculations are quite expensive. To optimize we use precomputed value. For all other architectures is is preprocessor definition. Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> LKML-Reference: <1248862529-6063-5-git-send-email-sgruszka@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
111 lines
3.3 KiB
C
111 lines
3.3 KiB
C
/*
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* Definitions for measuring cputime on ia64 machines.
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*
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* Based on <asm-powerpc/cputime.h>.
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*
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* Copyright (C) 2007 FUJITSU LIMITED
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* Copyright (C) 2007 Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
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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, 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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*/
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#ifndef __IA64_CPUTIME_H
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#define __IA64_CPUTIME_H
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#ifndef CONFIG_VIRT_CPU_ACCOUNTING
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#include <asm-generic/cputime.h>
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#else
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#include <linux/time.h>
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#include <linux/jiffies.h>
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#include <asm/processor.h>
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typedef u64 cputime_t;
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typedef u64 cputime64_t;
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#define cputime_zero ((cputime_t)0)
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#define cputime_one_jiffy jiffies_to_cputime(1)
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#define cputime_max ((~((cputime_t)0) >> 1) - 1)
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#define cputime_add(__a, __b) ((__a) + (__b))
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#define cputime_sub(__a, __b) ((__a) - (__b))
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#define cputime_div(__a, __n) ((__a) / (__n))
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#define cputime_halve(__a) ((__a) >> 1)
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#define cputime_eq(__a, __b) ((__a) == (__b))
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#define cputime_gt(__a, __b) ((__a) > (__b))
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#define cputime_ge(__a, __b) ((__a) >= (__b))
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#define cputime_lt(__a, __b) ((__a) < (__b))
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#define cputime_le(__a, __b) ((__a) <= (__b))
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#define cputime64_zero ((cputime64_t)0)
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#define cputime64_add(__a, __b) ((__a) + (__b))
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#define cputime64_sub(__a, __b) ((__a) - (__b))
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#define cputime_to_cputime64(__ct) (__ct)
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/*
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* Convert cputime <-> jiffies (HZ)
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*/
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#define cputime_to_jiffies(__ct) ((__ct) / (NSEC_PER_SEC / HZ))
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#define jiffies_to_cputime(__jif) ((__jif) * (NSEC_PER_SEC / HZ))
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#define cputime64_to_jiffies64(__ct) ((__ct) / (NSEC_PER_SEC / HZ))
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#define jiffies64_to_cputime64(__jif) ((__jif) * (NSEC_PER_SEC / HZ))
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/*
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* Convert cputime <-> milliseconds
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*/
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#define cputime_to_msecs(__ct) ((__ct) / NSEC_PER_MSEC)
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#define msecs_to_cputime(__msecs) ((__msecs) * NSEC_PER_MSEC)
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/*
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* Convert cputime <-> seconds
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*/
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#define cputime_to_secs(__ct) ((__ct) / NSEC_PER_SEC)
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#define secs_to_cputime(__secs) ((__secs) * NSEC_PER_SEC)
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/*
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* Convert cputime <-> timespec (nsec)
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*/
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static inline cputime_t timespec_to_cputime(const struct timespec *val)
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{
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cputime_t ret = val->tv_sec * NSEC_PER_SEC;
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return (ret + val->tv_nsec);
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}
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static inline void cputime_to_timespec(const cputime_t ct, struct timespec *val)
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{
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val->tv_sec = ct / NSEC_PER_SEC;
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val->tv_nsec = ct % NSEC_PER_SEC;
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}
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/*
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* Convert cputime <-> timeval (msec)
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*/
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static inline cputime_t timeval_to_cputime(struct timeval *val)
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{
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cputime_t ret = val->tv_sec * NSEC_PER_SEC;
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return (ret + val->tv_usec * NSEC_PER_USEC);
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}
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static inline void cputime_to_timeval(const cputime_t ct, struct timeval *val)
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{
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val->tv_sec = ct / NSEC_PER_SEC;
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val->tv_usec = (ct % NSEC_PER_SEC) / NSEC_PER_USEC;
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}
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/*
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* Convert cputime <-> clock (USER_HZ)
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*/
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#define cputime_to_clock_t(__ct) ((__ct) / (NSEC_PER_SEC / USER_HZ))
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#define clock_t_to_cputime(__x) ((__x) * (NSEC_PER_SEC / USER_HZ))
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/*
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* Convert cputime64 to clock.
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*/
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#define cputime64_to_clock_t(__ct) cputime_to_clock_t((cputime_t)__ct)
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#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
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#endif /* __IA64_CPUTIME_H */
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