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pc kernel: give cpu servers as many image cache strctures as processes

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

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

@@ -426,6 +426,7 @@

 		if(userpcnt < 10)

 			userpcnt = 70;

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

+		conf.nimage = conf.nproc;

 		/*

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

@@ -438,7 +439,6 @@

 		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 {

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

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

@@ -200,6 +200,7 @@

 		if(userpcnt < 10)

 			userpcnt = 70;

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

+		conf.nimage = conf.nproc;

 	} else {

 		if(userpcnt < 10) {

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