49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_SCHED_LOADAVG_H
|
|
#define _LINUX_SCHED_LOADAVG_H
|
|
|
|
/*
|
|
* These are the constant used to fake the fixed-point load-average
|
|
* counting. Some notes:
|
|
* - 11 bit fractions expand to 22 bits by the multiplies: this gives
|
|
* a load-average precision of 10 bits integer + 11 bits fractional
|
|
* - if you want to count load-averages more often, you need more
|
|
* precision, or rounding will get you. With 2-second counting freq,
|
|
* the EXP_n values would be 1981, 2034 and 2043 if still using only
|
|
* 11 bit fractions.
|
|
*/
|
|
extern unsigned long avenrun[]; /* Load averages */
|
|
extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
|
|
|
|
#define FSHIFT 11 /* nr of bits of precision */
|
|
#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
|
|
#define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
|
|
#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
|
|
#define EXP_5 2014 /* 1/exp(5sec/5min) */
|
|
#define EXP_15 2037 /* 1/exp(5sec/15min) */
|
|
|
|
/*
|
|
* a1 = a0 * e + a * (1 - e)
|
|
*/
|
|
static inline unsigned long
|
|
calc_load(unsigned long load, unsigned long exp, unsigned long active)
|
|
{
|
|
unsigned long newload;
|
|
|
|
newload = load * exp + active * (FIXED_1 - exp);
|
|
if (active >= load)
|
|
newload += FIXED_1-1;
|
|
|
|
return newload / FIXED_1;
|
|
}
|
|
|
|
extern unsigned long calc_load_n(unsigned long load, unsigned long exp,
|
|
unsigned long active, unsigned int n);
|
|
|
|
#define LOAD_INT(x) ((x) >> FSHIFT)
|
|
#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
|
|
|
|
extern void calc_global_load(void);
|
|
|
|
#endif /* _LINUX_SCHED_LOADAVG_H */
|