Pick the ac taking in account locality

Reference: /n/patches.lsub.org/patch/getaclocal
Date: Mon Jul 16 10:51:59 CES 2012
Signed-off-by: paurea@lsub.org

--- /sys/src/nix/k10/tcore.c	Thu Jul 12 10:53:54 2012
+++ /sys/src/nix/k10/tcore.c	Sun Jul 15 16:44:59 2012
@@ -22,7 +22,7 @@
 Mach*
 getac(Proc *p, int core)
 {
-	int i;
+	int i, j;
 	Mach *mp;
 
 	mp = nil;
@@ -44,13 +44,15 @@
 	Found:
 		mp->proc = p;
 	}else{
-		for(i = 0; i < MACHMAX; i++)
-			if((mp = sys->machptr[i]) != nil && mp->nixrole == NIXAC){
+		for(i = 0; i < MACHMAX; i++){
+			j = pickcore(p->color, i);
+			if((mp = sys->machptr[j]) != nil && mp->nixrole == NIXAC){
 				if(isbooting(mp))
 					continue;
 				if(mp->proc == nil)
 					goto Found;
 			}
+		}
 		error("not enough cores");
 	}
 	unlock(&nixaclock);