diff options
| author | Matthew Dillon <dillon@FreeBSD.org> | 1998-08-26 05:27:42 +0000 |
|---|---|---|
| committer | Matthew Dillon <dillon@FreeBSD.org> | 1998-08-26 05:27:42 +0000 |
| commit | 8e519d1f35ba644028d53e8fd7c90293efdf1993 (patch) | |
| tree | aca8aae388083a718d0a707c07a93910d4bee5f8 | |
| parent | 842d9777070702323c7602b462383d2092b3b715 (diff) | |
Notes
| -rw-r--r-- | sys/kern/kern_synch.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/sys/kern/kern_synch.c b/sys/kern/kern_synch.c index 749595a05216..2d5105514a20 100644 --- a/sys/kern/kern_synch.c +++ b/sys/kern/kern_synch.c @@ -36,7 +36,7 @@ * SUCH DAMAGE. * * @(#)kern_synch.c 8.9 (Berkeley) 5/19/95 - * $Id: kern_synch.c,v 1.60 1998/07/11 13:06:41 bde Exp $ + * $Id: kern_synch.c,v 1.61 1998/07/15 02:32:10 bde Exp $ */ #include "opt_ktrace.h" @@ -107,14 +107,21 @@ static void maybe_resched(struct proc *chk) { struct proc *p = curproc; /* XXX */ - /* If the current scheduler is the idle scheduler or - * the priority of the new one is higher then reschedule. + /* + * Compare priorities if the new process is on the same scheduler, + * otherwise the one on the more realtimeish scheduler wins. + * + * XXX idle scheduler still broken because proccess stays on idle + * scheduler during waits (such as when getting FS locks). If a + * standard process becomes runaway cpu-bound, the system can lockup + * due to idle-scheduler processes in wakeup never getting any cpu. */ if (p == 0 || - RTP_PRIO_BASE(p->p_rtprio.type) == RTP_PRIO_IDLE || - (chk->p_priority < curpriority && - RTP_PRIO_BASE(p->p_rtprio.type) == RTP_PRIO_BASE(chk->p_rtprio.type)) ) + (chk->p_priority < curpriority && RTP_PRIO_BASE(p->p_rtprio.type) == RTP_PRIO_BASE(chk->p_rtprio.type)) || + RTP_PRIO_BASE(chk->p_rtprio.type) < RTP_PRIO_BASE(p->p_rtprio.type) + ) { need_resched(); + } } #define ROUNDROBIN_INTERVAL (hz / quantum) |