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.

2 files changed, 4 insertions, 4 deletions

diff --git a/sys/dev/ic/ncr53c9x.c b/sys/dev/ic/ncr53c9x.c
index 71801c15489..7f468eee780 100644
--- a/sys/dev/ic/ncr53c9x.c
+++ b/sys/dev/ic/ncr53c9x.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ncr53c9x.c,v 1.11 2001/12/17 23:13:41 nordin Exp $	*/
+/*	$OpenBSD: ncr53c9x.c,v 1.12 2002/01/23 00:39:47 art Exp $	*/
 /*     $NetBSD: ncr53c9x.c,v 1.56 2000/11/30 14:41:46 thorpej Exp $    */
 
 /*
@@ -376,7 +376,7 @@ ncr53c9x_init(sc, doreset)
 	if (!ecb_pool_initialized) {
 		/* All instances share this pool */
 		pool_init(&ecb_pool, sizeof(struct ncr53c9x_ecb), 0, 0, 0,
-		    "ncr53c9x_ecb", 0, NULL, NULL, 0);
+		    "ncr53c9x_ecb", NULL);
 		ecb_pool_initialized = 1;
 	}
 
diff --git a/sys/dev/ic/wdc.c b/sys/dev/ic/wdc.c
index a26d906990d..3a37dbe17b9 100644
--- a/sys/dev/ic/wdc.c
+++ b/sys/dev/ic/wdc.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: wdc.c,v 1.45 2002/01/12 05:36:09 jason Exp $     */
+/*      $OpenBSD: wdc.c,v 1.46 2002/01/23 00:39:47 art Exp $     */
 /*	$NetBSD: wdc.c,v 1.68 1999/06/23 19:00:17 bouyer Exp $ */
 
 
@@ -659,7 +659,7 @@ wdcattach(chp)
 	if (inited == 0) {
 		/* Initialize the wdc_xfer pool. */
 		pool_init(&wdc_xfer_pool, sizeof(struct wdc_xfer), 0,
-		    0, 0, "wdcspl", 0, NULL, NULL, M_DEVBUF);
+		    0, 0, "wdcspl", NULL);
 		inited++;
 	}
 	TAILQ_INIT(&chp->ch_queue->sc_xfer);