PERFORCE change 96786 for review

[Kip Macy]

http://perforce.freebsd.org/chv.cgi?CH=96786

Change 96786 by kmacy at kmacy_storage:sun4v_rwbuf on 2006/05/07 21:19:03

	limit the range that vm_page_alloc_contig can allocate from to work
	around its poor handling of small memory ranges
	scrub hash table when a process exits as a workaround for finding 
	entries in the hash that don't exist in the pv list

Affected files ...

.. //depot/projects/kmacy_sun4v/src/sys/sun4v/sun4v/tte_hash.c#25 edit

Differences ...

==== //depot/projects/kmacy_sun4v/src/sys/sun4v/sun4v/tte_hash.c#25 (text+ko) ====

@@ -180,7 +180,6 @@
 	uma_zone_set_obj(thzone, &thzone_obj, tte_hash_max);
 }
 
-
 tte_hash_t
 tte_hash_kernel_create(vm_offset_t va, uint64_t size)
 {
@@ -195,7 +194,6 @@
 	return th;
 }
 
-
 tte_hash_t
 tte_hash_create(uint64_t context, uint64_t *scratchval)
 {
@@ -212,17 +210,17 @@
 	m = NULL;
 
 	while (m == NULL) {
-		m = vm_page_alloc_contig(HASH_SIZE, 2*PAGE_SIZE_4M, 
-					 (1UL<<34), PAGE_SIZE, (1UL<<34));
+		m = vm_page_alloc_contig(HASH_SIZE, phys_avail[0], 
+					 phys_avail[1], PAGE_SIZE, (1UL<<34));
 		if (m == NULL) {
 			printf("vm_page_alloc_contig failed - waiting to retry\n");
 			VM_WAIT;
 		}
 	}
-	for (i = 0, tm = m; i < HASH_SIZE; i++, tm++) {
+	for (i = 0, tm = m; i < HASH_SIZE; i++, tm++) 
 		if ((tm->flags & PG_ZERO) == 0)
 			pmap_zero_page(tm);
-	}
+
 	th->th_hashtable = (void *)TLB_PHYS_TO_DIRECT(VM_PAGE_TO_PHYS(m));
 	m = NULL;
 	while (m == NULL) {
@@ -268,6 +266,9 @@
 	fh->thf_head.fh_free_head = 0;
 	if (th->th_entries != 0)
 		panic("%d remaining entries", th->th_entries);
+#ifndef DONT_SCRUB_ENTRIES	
+	pmap_scrub_pages(TLB_DIRECT_TO_PHYS((vm_offset_t)th->th_hashtable), th->th_size*PAGE_SIZE); 
+#endif
 }
 
 static __inline void