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The taskstats interface uses microsecond granularity for the user and system time values. The conversion from cputime to the taskstats values uses the cputime_to_msecs primitive which effectively limits the granularity to milliseconds. Add the cputime_to_usecs primitive for architectures that have better, more precise CPU time values. Remove cputime_to_msecs primitive because there are no more users left. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: Luck Tony <tony.luck@intel.com> Cc: Shailabh Nagar <nagar1234@in.ibm.com> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Shailabh Nagar <nagar@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
211 lines
4.7 KiB
C
211 lines
4.7 KiB
C
/*
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* include/asm-s390/cputime.h
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*
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* (C) Copyright IBM Corp. 2004
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*
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* Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#ifndef _S390_CPUTIME_H
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#define _S390_CPUTIME_H
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#include <linux/types.h>
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#include <linux/percpu.h>
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#include <linux/spinlock.h>
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#include <asm/div64.h>
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/* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
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typedef unsigned long long cputime_t;
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typedef unsigned long long cputime64_t;
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#ifndef __s390x__
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static inline unsigned int
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__div(unsigned long long n, unsigned int base)
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{
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register_pair rp;
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rp.pair = n >> 1;
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asm ("dr %0,%1" : "+d" (rp) : "d" (base >> 1));
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return rp.subreg.odd;
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}
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#else /* __s390x__ */
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static inline unsigned int
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__div(unsigned long long n, unsigned int base)
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{
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return n / base;
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}
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#endif /* __s390x__ */
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#define cputime_zero (0ULL)
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#define cputime_one_jiffy jiffies_to_cputime(1)
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#define cputime_max ((~0UL >> 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) ({ \
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unsigned long long __div = (__a); \
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do_div(__div,__n); \
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__div; \
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})
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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 cputime_to_jiffies(__ct) (__div((__ct), 4096000000ULL / HZ))
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#define cputime_to_scaled(__ct) (__ct)
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#define jiffies_to_cputime(__hz) ((cputime_t)(__hz) * (4096000000ULL / HZ))
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#define cputime64_zero (0ULL)
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#define cputime64_add(__a, __b) ((__a) + (__b))
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#define cputime_to_cputime64(__ct) (__ct)
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static inline u64
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cputime64_to_jiffies64(cputime64_t cputime)
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{
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do_div(cputime, 4096000000ULL / HZ);
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return cputime;
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}
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/*
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* Convert cputime to microseconds and back.
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*/
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static inline unsigned int
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cputime_to_usecs(const cputime_t cputime)
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{
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return cputime_div(cputime, 4096);
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}
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static inline cputime_t
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usecs_to_cputime(const unsigned int m)
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{
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return (cputime_t) m * 4096;
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}
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/*
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* Convert cputime to milliseconds and back.
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*/
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static inline unsigned int
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cputime_to_secs(const cputime_t cputime)
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{
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return __div(cputime, 2048000000) >> 1;
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}
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static inline cputime_t
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secs_to_cputime(const unsigned int s)
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{
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return (cputime_t) s * 4096000000ULL;
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}
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/*
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* Convert cputime to timespec and back.
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*/
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static inline cputime_t
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timespec_to_cputime(const struct timespec *value)
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{
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return value->tv_nsec * 4096 / 1000 + (u64) value->tv_sec * 4096000000ULL;
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}
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static inline void
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cputime_to_timespec(const cputime_t cputime, struct timespec *value)
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{
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#ifndef __s390x__
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register_pair rp;
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rp.pair = cputime >> 1;
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asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
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value->tv_nsec = rp.subreg.even * 1000 / 4096;
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value->tv_sec = rp.subreg.odd;
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#else
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value->tv_nsec = (cputime % 4096000000ULL) * 1000 / 4096;
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value->tv_sec = cputime / 4096000000ULL;
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#endif
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}
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/*
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* Convert cputime to timeval and back.
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* Since cputime and timeval have the same resolution (microseconds)
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* this is easy.
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*/
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static inline cputime_t
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timeval_to_cputime(const struct timeval *value)
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{
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return value->tv_usec * 4096 + (u64) value->tv_sec * 4096000000ULL;
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}
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static inline void
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cputime_to_timeval(const cputime_t cputime, struct timeval *value)
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{
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#ifndef __s390x__
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register_pair rp;
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rp.pair = cputime >> 1;
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asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
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value->tv_usec = rp.subreg.even / 4096;
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value->tv_sec = rp.subreg.odd;
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#else
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value->tv_usec = (cputime % 4096000000ULL) / 4096;
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value->tv_sec = cputime / 4096000000ULL;
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#endif
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}
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/*
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* Convert cputime to clock and back.
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*/
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static inline clock_t
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cputime_to_clock_t(cputime_t cputime)
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{
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return cputime_div(cputime, 4096000000ULL / USER_HZ);
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}
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static inline cputime_t
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clock_t_to_cputime(unsigned long x)
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{
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return (cputime_t) x * (4096000000ULL / USER_HZ);
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}
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/*
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* Convert cputime64 to clock.
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*/
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static inline clock_t
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cputime64_to_clock_t(cputime64_t cputime)
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{
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return cputime_div(cputime, 4096000000ULL / USER_HZ);
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}
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struct s390_idle_data {
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unsigned int sequence;
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unsigned long long idle_count;
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unsigned long long idle_enter;
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unsigned long long idle_time;
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int nohz_delay;
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};
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DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
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void vtime_start_cpu(__u64 int_clock, __u64 enter_timer);
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cputime64_t s390_get_idle_time(int cpu);
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#define arch_idle_time(cpu) s390_get_idle_time(cpu)
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static inline void s390_idle_check(struct pt_regs *regs, __u64 int_clock,
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__u64 enter_timer)
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{
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if (regs->psw.mask & PSW_MASK_WAIT)
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vtime_start_cpu(int_clock, enter_timer);
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}
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static inline int s390_nohz_delay(int cpu)
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{
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return per_cpu(s390_idle, cpu).nohz_delay != 0;
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}
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#define arch_needs_cpu(cpu) s390_nohz_delay(cpu)
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#endif /* _S390_CPUTIME_H */
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