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pc64: limit memory of per processor mmu freelist to 1MB

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

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

@@ -29,7 +29,6 @@

 	Lock;

 	MMU	*free;

-	int	nshare;

 	int	nalloc;

 	int	nfree;

 } mmupool;

@@ -199,8 +198,6 @@

 			mmupool.free = p->next;

 			mmupool.nalloc += n;

 			mmupool.nfree += n-1;

-

-			mmupool.nshare = mmupool.nalloc / conf.nmach;

 		}

 		unlock(&mmupool);

 	}

@@ -357,7 +354,7 @@

 	p = proc->mmutail;

 	if(p == nil)

 		return;

-	if(m->mmucount < mmupool.nshare){

+	if(m->mmucount+proc->mmucount < 256){

 		p->next = m->mmufree;

 		m->mmufree = proc->mmuhead;

 		m->mmucount += proc->mmucount;