CVS commit: src/sys

[YAMAMOTO Takashi <yamt%netbsd.org@localhost>]

Module Name:    src
Committed By:   yamt
Date:           Tue Nov  1 09:07:53 UTC 2005

Modified Files:
        src/sys/kern: kern_synch.c
        src/sys/sys: proc.h

Log Message:
make scheduler work better when a system has many runnable processes
by making p_estcpu fixpt_t.  PR/31542.

1. schedcpu() decreases p_estcpu of all processes
   every seconds, by at least 1 regardless of load average.
2. schedclock() increases p_estcpu of curproc by 1,
   at about 16 hz.

in the consequence, if a system has >16 processes
with runnable lwps, their p_estcpu are not likely increased.

by making p_estcpu fixpt_t, we can decay it more slowly
when loadavg is high.  (ie. solve #1.)

i left kinfo_proc2::p_estcpu (ie. ps -O cpu) scaled because i have
no idea about its absolute value's usage other than debugging,
for which raw values are more valuable.


To generate a diff of this commit:
cvs rdiff -r1.152 -r1.153 src/sys/kern/kern_synch.c
cvs rdiff -r1.206 -r1.207 src/sys/sys/proc.h

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.