1 #ifndef _LINUX_SCHED_LOADAVG_H
2 #define _LINUX_SCHED_LOADAVG_H
4 #include <linux/sched.h>
7 * These are the constant used to fake the fixed-point load-average
8 * counting. Some notes:
9 * - 11 bit fractions expand to 22 bits by the multiplies: this gives
10 * a load-average precision of 10 bits integer + 11 bits fractional
11 * - if you want to count load-averages more often, you need more
12 * precision, or rounding will get you. With 2-second counting freq,
13 * the EXP_n values would be 1981, 2034 and 2043 if still using only
16 extern unsigned long avenrun[]; /* Load averages */
17 extern void get_avenrun(unsigned long *loads, unsigned long offset, int shift);
19 #define FSHIFT 11 /* nr of bits of precision */
20 #define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */
21 #define LOAD_FREQ (5*HZ+1) /* 5 sec intervals */
22 #define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */
23 #define EXP_5 2014 /* 1/exp(5sec/5min) */
24 #define EXP_15 2037 /* 1/exp(5sec/15min) */
26 #define CALC_LOAD(load,exp,n) \
28 load += n*(FIXED_1-exp); \
31 extern void calc_global_load(unsigned long ticks);
33 #endif /* _LINUX_SCHED_LOADAVG_H */