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/kern_sig.c b/sys/kern/kern_sig.c
index c0fd97f1021..6d1c0be45ef 100644
--- a/sys/kern/kern_sig.c
+++ b/sys/kern/kern_sig.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: kern_sig.c,v 1.52 2002/01/19 19:00:14 millert Exp $	*/
+/*	$OpenBSD: kern_sig.c,v 1.53 2002/01/23 00:39:47 art Exp $	*/
 /*	$NetBSD: kern_sig.c,v 1.54 1996/04/22 01:38:32 christos Exp $	*/
 
 /*
@@ -152,7 +152,7 @@ void
 signal_init()
 {
 	pool_init(&sigacts_pool, sizeof(struct sigacts), 0, 0, 0, "sigapl",
-	    0, pool_page_alloc_nointr, pool_page_free_nointr, M_SUBPROC);
+	    &pool_allocator_nointr);
 }
 
 /*