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kernel: fix accounttime() for HZ >= 1000

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"milli-CPU's" is too low resolution for the decaying load average
calculation when HZ >= 1000.
This commit is contained in:
cinap_lenrek 2015-06-12 14:28:31 +02:00
parent 2112ad6793
commit 34ae4649cc
1 changed files with 6 additions and 5 deletions
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11
sys/src/9/port/proc.c
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@ -1602,14 +1602,14 @@ accounttime(void)
n = perfticks();
per = n - m->perf.last;
m->perf.last = n;
per = (m->perf.period*(HZ-1) + per)/HZ;
per = ((uvlong)m->perf.period*(HZ-1) + per)/HZ;
if(per != 0)
m->perf.period = per;
m->perf.avg_inidle = (m->perf.avg_inidle*(HZ-1)+m->perf.inidle)/HZ;
m->perf.avg_inidle = ((uvlong)m->perf.avg_inidle*(HZ-1)+m->perf.inidle)/HZ;
m->perf.inidle = 0;
m->perf.avg_inintr = (m->perf.avg_inintr*(HZ-1)+m->perf.inintr)/HZ;
m->perf.avg_inintr = ((uvlong)m->perf.avg_inintr*(HZ-1)+m->perf.inintr)/HZ;
m->perf.inintr = 0;
/* only one processor gets to compute system load averages */
@ -1627,8 +1627,9 @@ accounttime(void)
*/
n = nrun;
nrun = 0;
n = (nrdy+n)*1000;
m->load = (m->load*(HZ-1)+n)/HZ;
n = (nrdy+n)*1000*100;
load = ((uvlong)load*(HZ-1)+n)/HZ;
m->load = load/100;
}
int