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[root@opendigest root]# uptime
7:51pm up 2 days, 5:43, 2 users, load average: 8.13, 5.90, 4.94
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Îļþ: include/linux/sched.h:
#define FSHIFT 11 /* nr of bits of precision */
#define FIXED_1 (1<#define LOAD_FREQ (5*HZ) /* 5 sec intervals */
#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point, 2048/pow(exp(1), 5.0/60) */
#define EXP_5 2014 /* 1/exp(5sec/5min), 2048/pow(exp(1), 5.0/300) */
#define EXP_15 2037 /* 1/exp(5sec/15min), 2048/pow(exp(1), 5.0/900) */
#define CALC_LOAD(load,exp,n) \
load *= exp; \
load += n*(FIXED_1-exp); \
load >>= FSHIFT;
/**********************************************************/
Îļþ: kernel/timer.c:
unsigned long avenrun[3];
static inline void calc_load(unsigned long ticks)
{
unsigned long active_tasks; /* fixed-point */
static int count = LOAD_FREQ;
count -= ticks;
if (count < 0) {
count += LOAD_FREQ;
active_tasks = count_active_tasks();
CALC_LOAD(avenrun[0], EXP_1, active_tasks);
CALC_LOAD(avenrun[1], EXP_5, active_tasks);
CALC_LOAD(avenrun[2], EXP_15
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