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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849/* 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 longcalc_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 */