Date: Thu, 6 Jun 1996 22:00:31 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: fcurrent@jraynard.demon.co.uk (James Raynard) Cc: plm@xs4all.nl, freebsd-current@FreeBSD.org Subject: Re: More on VM, swap leaks Message-ID: <199606070300.WAA01131@dyson.iquest.net> In-Reply-To: <199606070203.CAA02611@jraynard.demon.co.uk> from "James Raynard" at Jun 7, 96 02:03:44 am
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>
>
> > JH> Another possibility is a bad emacs binary. Especially since
> > JH> as part of the compilation process, emacs runs itself, loads
> > JH> in a bunch of LISP, then pukes itself out as a new executable.
> > JH> I shudder to think what could happen if a buggy kernel or bad
> > JH> SIMM decided to rear its head at that point.
> >
> > I have the same problems.
>
> I have had other programs die, as well Emacs:-
>
> Jun 4 16:05:00 jraynard /kernel: pid 10265 (atrun), uid 0: exited on signal 10
> Jun 6 23:16:05 jraynard /kernel: pid 148 (innd), uid 8: exited on signal 10
>
No guarantees, but I found a *major* omission in pmap.c. Replace the
pmap_object_init_pt routine in pmap.c with the following, and see how
things go:
void
pmap_object_init_pt(pmap, addr, object, pindex, size, limit)
pmap_t pmap;
vm_offset_t addr;
vm_object_t object;
vm_pindex_t pindex;
vm_size_t size;
int limit;
{
vm_offset_t tmpidx;
int psize;
vm_page_t p;
int objpgs;
psize = (size >> PAGE_SHIFT);
if (!pmap || (object->type != OBJT_VNODE) ||
(limit && (psize > MAX_INIT_PT) &&
(object->resident_page_count > MAX_INIT_PT))) {
return;
}
/*
* if we are processing a major portion of the object, then scan the
* entire thing.
*/
if (psize > (object->size >> 2)) {
objpgs = psize;
for (p = TAILQ_FIRST(&object->memq);
((objpgs > 0) && (p != NULL));
p = TAILQ_NEXT(p, listq)) {
tmpidx = p->pindex;
if (tmpidx < pindex) {
continue;
}
tmpidx -= pindex;
if (tmpidx >= psize) {
continue;
}
if (((p->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL) &&
(p->busy == 0) &&
(p->flags & (PG_BUSY | PG_FICTITIOUS)) == 0) {
if (p->queue == PQ_CACHE)
vm_page_deactivate(p);
p->flags |= PG_BUSY;
pmap_enter_quick(pmap,
addr + (tmpidx << PAGE_SHIFT),
VM_PAGE_TO_PHYS(p));
p->flags |= PG_MAPPED;
PAGE_WAKEUP(p);
}
objpgs -= 1;
}
} else {
/*
* else lookup the pages one-by-one.
*/
for (tmpidx = 0; tmpidx < psize; tmpidx += 1) {
p = vm_page_lookup(object, tmpidx + pindex);
if (p &&
((p->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL) &&
(p->busy == 0) &&
(p->flags & (PG_BUSY | PG_FICTITIOUS)) == 0) {
if (p->queue == PQ_CACHE)
vm_page_deactivate(p);
p->flags |= PG_BUSY;
pmap_enter_quick(pmap,
addr + (tmpidx << PAGE_SHIFT),
VM_PAGE_TO_PHYS(p));
p->flags |= PG_MAPPED;
PAGE_WAKEUP(p);
}
}
}
return;
}
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