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Linux/include/linux/sched/loadavg.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _LINUX_SCHED_LOADAVG_H
  3 #define _LINUX_SCHED_LOADAVG_H
  4 
  5 /*
  6  * These are the constant used to fake the fixed-point load-average
  7  * counting. Some notes:
  8  *  - 11 bit fractions expand to 22 bits by the multiplies: this gives
  9  *    a load-average precision of 10 bits integer + 11 bits fractional
 10  *  - if you want to count load-averages more often, you need more
 11  *    precision, or rounding will get you. With 2-second counting freq,
 12  *    the EXP_n values would be 1981, 2034 and 2043 if still using only
 13  *    11 bit fractions.
 14  */
 15 extern unsigned long avenrun[];         /* Load averages */
 16 extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
 17 
 18 #define FSHIFT          11              /* nr of bits of precision */
 19 #define FIXED_1         (1<<FSHIFT)     /* 1.0 as fixed-point */
 20 #define LOAD_FREQ       (5*HZ+1)        /* 5 sec intervals */
 21 #define EXP_1           1884            /* 1/exp(5sec/1min) as fixed-point */
 22 #define EXP_5           2014            /* 1/exp(5sec/5min) */
 23 #define EXP_15          2037            /* 1/exp(5sec/15min) */
 24 
 25 /*
 26  * a1 = a0 * e + a * (1 - e)
 27  */
 28 static inline unsigned long
 29 calc_load(unsigned long load, unsigned long exp, unsigned long active)
 30 {
 31         unsigned long newload;
 32 
 33         newload = load * exp + active * (FIXED_1 - exp);
 34         if (active >= load)
 35                 newload += FIXED_1-1;
 36 
 37         return newload / FIXED_1;
 38 }
 39 
 40 extern unsigned long calc_load_n(unsigned long load, unsigned long exp,
 41                                  unsigned long active, unsigned int n);
 42 
 43 #define LOAD_INT(x) ((x) >> FSHIFT)
 44 #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
 45 
 46 extern void calc_global_load(void);
 47 
 48 #endif /* _LINUX_SCHED_LOADAVG_H */
 49 

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