diff options
| author | Artur Grabowski <art@cvs.openbsd.org> | 2000-04-19 09:58:21 +0000 |
|---|---|---|
| committer | Artur Grabowski <art@cvs.openbsd.org> | 2000-04-19 09:58:21 +0000 |
| commit | 1eb85a579a0d9030c50d66f0327dee8387ccf303 (patch) | |
| tree | de76153b3fd63ba73b6b358f5ff3f88c5deda1c2 /sys/kern/kern_subr.c | |
| parent | c5af69f27d7fb2fb195805f354bb466926706ff7 (diff) | |
Remove the roundrobin_attempts hack and replace it with per-process scheduling
flags (much nicer for future smp work).
Add two generic functions yield() and preempt(). Use preepmt() in uio when
we are told to yield.
Based on my idea, code written by Jason Thorpe from NetBSD.
Diffstat (limited to 'sys/kern/kern_subr.c')
| -rw-r--r-- | sys/kern/kern_subr.c | 24 |
1 files changed, 3 insertions, 21 deletions
diff --git a/sys/kern/kern_subr.c b/sys/kern/kern_subr.c index 7c7550b9861..59a1ebc0d06 100644 --- a/sys/kern/kern_subr.c +++ b/sys/kern/kern_subr.c @@ -1,4 +1,4 @@ -/* $OpenBSD: kern_subr.c,v 1.11 2000/03/03 16:58:49 art Exp $ */ +/* $OpenBSD: kern_subr.c,v 1.12 2000/04/19 09:58:20 art Exp $ */ /* $NetBSD: kern_subr.c,v 1.15 1996/04/09 17:21:56 ragge Exp $ */ /* @@ -49,10 +49,6 @@ #include <sys/kernel.h> #include <sys/resourcevar.h> -void uio_yield __P((struct proc *)); - -#define UIO_NEED_YIELD (roundrobin_attempts >= 2) - int uiomove(cp, n, uio) register caddr_t cp; @@ -85,8 +81,8 @@ uiomove(cp, n, uio) switch (uio->uio_segflg) { case UIO_USERSPACE: - if (UIO_NEED_YIELD) - uio_yield(p); + if (p->p_schedflags & PSCHED_SHOULDYIELD) + preempt(NULL); if (uio->uio_rw == UIO_READ) error = copyout(cp, iov->iov_base, cnt); else @@ -168,20 +164,6 @@ again: return (0); } -void -uio_yield(p) - struct proc *p; -{ - int s; - - p->p_priority = p->p_usrpri; - s = splstatclock(); - setrunqueue(p); - p->p_stats->p_ru.ru_nivcsw++; - mi_switch(); - splx(s); -} - /* * General routine to allocate a hash table. */ |