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, 3 deletions

diff --git a/sys/kern/sys_pipe.c b/sys/kern/sys_pipe.c
index 39bc68dfc84..4543cbe9678 100644
--- a/sys/kern/sys_pipe.c
+++ b/sys/kern/sys_pipe.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: sys_pipe.c,v 1.40 2001/11/06 19:53:20 miod Exp $	*/
+/*	$OpenBSD: sys_pipe.c,v 1.41 2002/01/23 00:39:47 art Exp $	*/
 
 /*
  * Copyright (c) 1996 John S. Dyson
@@ -846,7 +846,6 @@ void
 pipe_init()
 {
 	pool_init(&pipe_pool, sizeof(struct pipe), 0, 0, 0, "pipepl",
-		0, pool_page_alloc_nointr, pool_page_free_nointr,
-		M_PIPE);
+	    &pool_allocator_nointr);
 }