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kernel: image reclaim pauses

get a bit more verbose about process image exhaustion and make
imagreclaim() try to get at least one image on the freelist.

use rsrcwait() to notify the state, and call freebroken() in
case imagereclaim() couldnt free any images.

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

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

@@ -264,7 +264,10 @@

 	while(!(i = imagealloc.free)) {

 		unlock(&imagealloc);

 		imagereclaim();

-		sched();

+		if(!imagealloc.free){

+			freebroken();		/* can use the memory */

+			resrcwait("no image after reclaim");

+		}

 		lock(&imagealloc);

 	}

@@ -328,7 +331,7 @@

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

 	 * backward.

 	 */

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

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

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

 			if(p->ref == 0) {

 				n++;

-- 

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