Pool deals fairly well with physical memory shortage, but it doesn't deal

well (not at all) with shortages of the vm_map where the pages are mapped
(usually kmem_map).

Try to deal with it:
 - group all information the backend allocator for a pool in a separate
   struct. The pool will only have a pointer to that struct.
 - change the pool_init API to reflect that.
 - link all pools allocating from the same allocator on a linked list.
 - Since an allocator is responsible to wait for physical memory it will
   only fail (waitok) when it runs out of its backing vm_map, carefully
   drain pools using the same allocator so that va space is freed.
   (see comments in code for caveats and details).
 - change pool_reclaim to return if it actually succeeded to free some
   memory, use that information to make draining easier and more efficient.
 - get rid of PR_URGENT, noone uses it.

1 files changed, 2 insertions, 2 deletions

diff --git a/sys/kern/subr_extent.c b/sys/kern/subr_extent.c
index 1b879c6755c..be00d755fc2 100644
--- a/sys/kern/subr_extent.c
+++ b/sys/kern/subr_extent.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: subr_extent.c,v 1.18 2001/08/06 11:19:26 art Exp $	*/
+/*	$OpenBSD: subr_extent.c,v 1.19 2002/01/23 00:39:47 art Exp $	*/
 /*	$NetBSD: subr_extent.c,v 1.7 1996/11/21 18:46:34 cgd Exp $	*/
 
 /*-
@@ -114,7 +114,7 @@ extent_pool_init(void)
 
 	if (!inited) {
 		pool_init(&ex_region_pl, sizeof(struct extent_region), 0, 0, 0,
-		    "extentpl", 0, 0, 0, 0);
+		    "extentpl", NULL);
 		inited = 1;
 	}
 }