diff options
| author | dyson <dyson@FreeBSD.org> | 1997-08-09 10:13:32 +0000 |
|---|---|---|
| committer | dyson <dyson@FreeBSD.org> | 1997-08-09 10:13:32 +0000 |
| commit | c38957d22b79e58dcfc2f1111afcbbc0019cfe89 (patch) | |
| tree | 032e068c65840f25e7fb938a4469b88eb574d5fd /sys/kern/subr_trap.c | |
| parent | 4843904b0d4173aaa56c2fb2ffd890565f7a2198 (diff) | |
| download | FreeBSD-src-c38957d22b79e58dcfc2f1111afcbbc0019cfe89.zip FreeBSD-src-c38957d22b79e58dcfc2f1111afcbbc0019cfe89.tar.gz | |
Modify the scheduling policy to take into account disk I/O waits
as chargeable CPU usage. This should mitigate the problem of processes
doing disk I/O hogging the CPU. Various users have reported the
problem, and test code shows that the problem should now be gone.
Diffstat (limited to 'sys/kern/subr_trap.c')
| -rw-r--r-- | sys/kern/subr_trap.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/sys/kern/subr_trap.c b/sys/kern/subr_trap.c index 7110933..516925f 100644 --- a/sys/kern/subr_trap.c +++ b/sys/kern/subr_trap.c @@ -35,7 +35,7 @@ * SUCH DAMAGE. * * from: @(#)trap.c 7.4 (Berkeley) 5/13/91 - * $Id: trap.c,v 1.101 1997/07/20 08:37:23 bde Exp $ + * $Id: trap.c,v 1.102 1997/08/09 00:02:52 dyson Exp $ */ /* @@ -144,6 +144,19 @@ userret(p, frame, oticks) while ((sig = CURSIG(p)) != 0) postsig(sig); + +#if !defined(NO_SCHEDULE_MODS) + if (!want_resched && + (p->p_priority <= p->p_usrpri) && + (p->p_rtprio.type == RTP_PRIO_NORMAL)) { + int newpriority; + p->p_estcpu += 1; + newpriority = PUSER + p->p_estcpu / 4 + 2 * p->p_nice; + newpriority = min(newpriority, MAXPRI); + p->p_usrpri = newpriority; + } +#endif + p->p_priority = p->p_usrpri; if (want_resched) { /* |
