e98bbaafcd
Replace the spinlock used in the idle time accounting with a sequence counter mechanism analog to seqlock. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
200 lines
4.4 KiB
C
200 lines
4.4 KiB
C
/*
|
|
* include/asm-s390/cputime.h
|
|
*
|
|
* (C) Copyright IBM Corp. 2004
|
|
*
|
|
* Author: Martin Schwidefsky <schwidefsky@de.ibm.com>
|
|
*/
|
|
|
|
#ifndef _S390_CPUTIME_H
|
|
#define _S390_CPUTIME_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/spinlock.h>
|
|
#include <asm/div64.h>
|
|
|
|
/* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */
|
|
|
|
typedef unsigned long long cputime_t;
|
|
typedef unsigned long long cputime64_t;
|
|
|
|
#ifndef __s390x__
|
|
|
|
static inline unsigned int
|
|
__div(unsigned long long n, unsigned int base)
|
|
{
|
|
register_pair rp;
|
|
|
|
rp.pair = n >> 1;
|
|
asm ("dr %0,%1" : "+d" (rp) : "d" (base >> 1));
|
|
return rp.subreg.odd;
|
|
}
|
|
|
|
#else /* __s390x__ */
|
|
|
|
static inline unsigned int
|
|
__div(unsigned long long n, unsigned int base)
|
|
{
|
|
return n / base;
|
|
}
|
|
|
|
#endif /* __s390x__ */
|
|
|
|
#define cputime_zero (0ULL)
|
|
#define cputime_max ((~0UL >> 1) - 1)
|
|
#define cputime_add(__a, __b) ((__a) + (__b))
|
|
#define cputime_sub(__a, __b) ((__a) - (__b))
|
|
#define cputime_div(__a, __n) ({ \
|
|
unsigned long long __div = (__a); \
|
|
do_div(__div,__n); \
|
|
__div; \
|
|
})
|
|
#define cputime_halve(__a) ((__a) >> 1)
|
|
#define cputime_eq(__a, __b) ((__a) == (__b))
|
|
#define cputime_gt(__a, __b) ((__a) > (__b))
|
|
#define cputime_ge(__a, __b) ((__a) >= (__b))
|
|
#define cputime_lt(__a, __b) ((__a) < (__b))
|
|
#define cputime_le(__a, __b) ((__a) <= (__b))
|
|
#define cputime_to_jiffies(__ct) (__div((__ct), 4096000000ULL / HZ))
|
|
#define cputime_to_scaled(__ct) (__ct)
|
|
#define jiffies_to_cputime(__hz) ((cputime_t)(__hz) * (4096000000ULL / HZ))
|
|
|
|
#define cputime64_zero (0ULL)
|
|
#define cputime64_add(__a, __b) ((__a) + (__b))
|
|
#define cputime_to_cputime64(__ct) (__ct)
|
|
|
|
static inline u64
|
|
cputime64_to_jiffies64(cputime64_t cputime)
|
|
{
|
|
do_div(cputime, 4096000000ULL / HZ);
|
|
return cputime;
|
|
}
|
|
|
|
/*
|
|
* Convert cputime to milliseconds and back.
|
|
*/
|
|
static inline unsigned int
|
|
cputime_to_msecs(const cputime_t cputime)
|
|
{
|
|
return __div(cputime, 4096000);
|
|
}
|
|
|
|
static inline cputime_t
|
|
msecs_to_cputime(const unsigned int m)
|
|
{
|
|
return (cputime_t) m * 4096000;
|
|
}
|
|
|
|
/*
|
|
* Convert cputime to milliseconds and back.
|
|
*/
|
|
static inline unsigned int
|
|
cputime_to_secs(const cputime_t cputime)
|
|
{
|
|
return __div(cputime, 2048000000) >> 1;
|
|
}
|
|
|
|
static inline cputime_t
|
|
secs_to_cputime(const unsigned int s)
|
|
{
|
|
return (cputime_t) s * 4096000000ULL;
|
|
}
|
|
|
|
/*
|
|
* Convert cputime to timespec and back.
|
|
*/
|
|
static inline cputime_t
|
|
timespec_to_cputime(const struct timespec *value)
|
|
{
|
|
return value->tv_nsec * 4096 / 1000 + (u64) value->tv_sec * 4096000000ULL;
|
|
}
|
|
|
|
static inline void
|
|
cputime_to_timespec(const cputime_t cputime, struct timespec *value)
|
|
{
|
|
#ifndef __s390x__
|
|
register_pair rp;
|
|
|
|
rp.pair = cputime >> 1;
|
|
asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
|
|
value->tv_nsec = rp.subreg.even * 1000 / 4096;
|
|
value->tv_sec = rp.subreg.odd;
|
|
#else
|
|
value->tv_nsec = (cputime % 4096000000ULL) * 1000 / 4096;
|
|
value->tv_sec = cputime / 4096000000ULL;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Convert cputime to timeval and back.
|
|
* Since cputime and timeval have the same resolution (microseconds)
|
|
* this is easy.
|
|
*/
|
|
static inline cputime_t
|
|
timeval_to_cputime(const struct timeval *value)
|
|
{
|
|
return value->tv_usec * 4096 + (u64) value->tv_sec * 4096000000ULL;
|
|
}
|
|
|
|
static inline void
|
|
cputime_to_timeval(const cputime_t cputime, struct timeval *value)
|
|
{
|
|
#ifndef __s390x__
|
|
register_pair rp;
|
|
|
|
rp.pair = cputime >> 1;
|
|
asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL));
|
|
value->tv_usec = rp.subreg.even / 4096;
|
|
value->tv_sec = rp.subreg.odd;
|
|
#else
|
|
value->tv_usec = (cputime % 4096000000ULL) / 4096;
|
|
value->tv_sec = cputime / 4096000000ULL;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Convert cputime to clock and back.
|
|
*/
|
|
static inline clock_t
|
|
cputime_to_clock_t(cputime_t cputime)
|
|
{
|
|
return __div(cputime, 4096000000ULL / USER_HZ);
|
|
}
|
|
|
|
static inline cputime_t
|
|
clock_t_to_cputime(unsigned long x)
|
|
{
|
|
return (cputime_t) x * (4096000000ULL / USER_HZ);
|
|
}
|
|
|
|
/*
|
|
* Convert cputime64 to clock.
|
|
*/
|
|
static inline clock_t
|
|
cputime64_to_clock_t(cputime64_t cputime)
|
|
{
|
|
return __div(cputime, 4096000000ULL / USER_HZ);
|
|
}
|
|
|
|
struct s390_idle_data {
|
|
unsigned int sequence;
|
|
unsigned long long idle_count;
|
|
unsigned long long idle_enter;
|
|
unsigned long long idle_time;
|
|
};
|
|
|
|
DECLARE_PER_CPU(struct s390_idle_data, s390_idle);
|
|
|
|
void vtime_start_cpu(void);
|
|
cputime64_t s390_get_idle_time(int cpu);
|
|
|
|
#define arch_idle_time(cpu) s390_get_idle_time(cpu)
|
|
|
|
static inline void s390_idle_check(void)
|
|
{
|
|
if ((&__get_cpu_var(s390_idle))->idle_enter != 0ULL)
|
|
vtime_start_cpu();
|
|
}
|
|
|
|
#endif /* _S390_CPUTIME_H */
|