123456789101112131415161718192021222324252627282930313233343536373839404142434445464748 |
- /* 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 */
|