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Keep the vm_fault/vm_pageout from getting into an "infinite paging loop", by

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reserving "cached" pages before waking up the pageout daemon.  This will reserve
the faulted page, and keep the system from thrashing itself to death given
this condition.
This commit is contained in:
John Dyson 1996-06-10 00:25:40 +00:00
parent b55b9e3f1d
commit c82b01813e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=16268
1 changed files with 7 additions and 3 deletions
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10
sys/vm/vm_fault.c
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@ -66,7 +66,7 @@
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*
* $Id: vm_fault.c,v 1.48 1996/06/01 20:50:57 dyson Exp $
* $Id: vm_fault.c,v 1.49 1996/06/08 06:48:32 dyson Exp $
*/
/*
@ -261,6 +261,7 @@ RetryFault:;
while (TRUE) {
m = vm_page_lookup(object, pindex);
if (m != NULL) {
int queue;
/*
* If the page is being brought in, wait for it and
* then retry.
@ -280,18 +281,21 @@ RetryFault:;
goto RetryFault;
}
queue = m->queue;
vm_page_unqueue_nowakeup(m);
/*
* Mark page busy for other processes, and the pagedaemon.
*/
if ((m->queue == PQ_CACHE) &&
if ((queue == PQ_CACHE) &&
(cnt.v_free_count + cnt.v_cache_count) < cnt.v_free_min) {
vm_page_activate(m);
UNLOCK_AND_DEALLOCATE;
VM_WAIT;
goto RetryFault;
}
m->flags |= PG_BUSY;
vm_page_unqueue_nowakeup(m);
if (m->valid &&
((m->valid & VM_PAGE_BITS_ALL) != VM_PAGE_BITS_ALL) &&