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--- a/sys/src/9/port/page.c

+++ b/sys/src/9/port/page.c

@@ -64,7 +64,7 @@

 	print("%ldM swap\n", vkb/1024);

 }

-static void

+void

 pageunchain(Page *p)

 {

 	if(canlock(&palloc))

--- a/sys/src/9/port/portfns.h

+++ b/sys/src/9/port/portfns.h

@@ -202,6 +202,7 @@

 int		openmode(ulong);

 Block*		packblock(Block*);

 Block*		padblock(Block*, int);

+void		pageunchain(Page*);

 void		pagechainhead(Page*);

 void		pageinit(void);

 ulong	pagenumber(Page*);

--- a/sys/src/9/port/segment.c

+++ b/sys/src/9/port/segment.c

@@ -313,7 +313,7 @@

 imagereclaim(void)

 {

 	int n;

-	Page *p;

+	Page *p, *x;

 	uvlong ticks;

 	irstats.calls++;

@@ -329,11 +329,16 @@

 	 * end of the list (see putpage) so start there and work

 	 * backward.

 	 */

-	for(p = palloc.tail; p && p->image && (n<1000 || !imagealloc.free); p = p->prev) {

+	for(p = palloc.tail; p && p->image && (n<1000 || !imagealloc.free); p = x) {

+		x = p->prev;

 		if(p->ref == 0 && canlock(p)) {

 			if(p->ref == 0 && p->image && !p->image->notext) {

 				n++;

 				uncachepage(p);

+

+				/* move to head to maintain the invariant above */

+				pageunchain(p);

+				pagechainhead(p);

 			}

 			unlock(p);

 		}

-- 

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