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pc64: remove cpuserver bigboy hack and honor *kernelpercent=

--- a/sys/src/9/pc64/main.c

+++ b/sys/src/9/pc64/main.c

@@ -199,21 +199,6 @@

 		if(userpcnt < 10)

 			userpcnt = 70;

 		kpages = conf.npage - (conf.npage*userpcnt)/100;

-

-		/*

-		 * Hack for the big boys. Only good while physmem < 4GB.

-		 * Give the kernel fixed max + enough to allocate the

-		 * page pool.

-		 * This is an overestimate as conf.upages < conf.npages.

-		 * The patch of nimage is a band-aid, scanning the whole

-		 * page list in imagereclaim just takes too long.

-		 */

-		if(getconf("*imagemaxmb") == 0)

-		if(kpages > (64*MB + conf.npage*sizeof(Page))/BY2PG){

-			kpages = (64*MB + conf.npage*sizeof(Page))/BY2PG;

-			conf.nimage = 2000;

-			kpages += (conf.nproc*KSTACK)/BY2PG;

-		}

 	} else {

 		if(userpcnt < 10) {

 			if(conf.npage*BY2PG < 16*MB)