| /* 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) */ |
| |
| #define CALC_LOAD(load,exp,n) \ |
| load *= exp; \ |
| load += n*(FIXED_1-exp); \ |
| load >>= FSHIFT; |
| |
| extern void calc_global_load(unsigned long ticks); |
| |
| #endif /* _LINUX_SCHED_LOADAVG_H */ |
