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/* 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(unsigned long ticks); #endif /* _LINUX_SCHED_LOADAVG_H */
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