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From: Alexander Leidinger <netchild@FreeBSD.org>
Date: Fri, 8 Jan 2010 09:59:13 +0000 (UTC)
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Subject: svn commit: r201777 -
	stable/8/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
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Author: netchild
Date: Fri Jan  8 09:59:13 2010
New Revision: 201777
URL: http://svn.freebsd.org/changeset/base/201777

Log:
  MFC r197816:
  ---snip---
      Prevent paging pressure from draining arc too much
      - always drain arc if above arc_c_max - never drain arc if arc is below
        arc_c_max
  ---snip---

Modified:
  stable/8/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/xen/xenpci/   (props changed)

Modified: stable/8/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
==============================================================================
--- stable/8/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c	Fri Jan  8 09:31:19 2010	(r201776)
+++ stable/8/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c	Fri Jan  8 09:59:13 2010	(r201777)
@@ -1821,6 +1821,12 @@ arc_reclaim_needed(void)
 #endif
 
 #ifdef _KERNEL
+	if (needfree)
+		return (1);
+	if (arc_size > arc_c_max)
+		return (1);
+	if (arc_size <= arc_c_min)
+		return (0);
 
 	/*
 	 * If pages are needed or we're within 2048 pages 
@@ -1829,9 +1835,6 @@ arc_reclaim_needed(void)
 	if (vm_pages_needed || (vm_paging_target() > -2048))
 		return (1);
 
-	if (needfree)
-		return (1);
-
 #if 0
 	/*
 	 * take 'desfree' extra pages, so we reclaim sooner, rather than later