svn commit: r305391 - head/sys/arm64/arm64

[Andrew Turner]

Author: andrew
Date: Sun Sep  4 17:50:23 2016
New Revision: 305391
URL: https://svnweb.freebsd.org/changeset/base/305391

Log:
  Enable superpages on arm64 by default. These seem to be stable, having
  survived multiple world and kernel builds, and of poudriere building full
  package sets.
  
  I have observed a 3% reduction in buildworld times with superpages enabled,
  however further testing is needed to see if this is observed in other
  workloads.
  
  Obtained from:	ABT Systems Ltd
  MFC after:	1 month
  Sponsored by:	The FreeBSD Foundation

Modified:
  head/sys/arm64/arm64/pmap.c

Modified: head/sys/arm64/arm64/pmap.c
==============================================================================
--- head/sys/arm64/arm64/pmap.c	Sun Sep  4 17:26:42 2016	(r305390)
+++ head/sys/arm64/arm64/pmap.c	Sun Sep  4 17:50:23 2016	(r305391)
@@ -242,7 +242,7 @@ extern pt_entry_t pagetable_dmap[];
 
 static SYSCTL_NODE(_vm, OID_AUTO, pmap, CTLFLAG_RD, 0, "VM/pmap parameters");
 
-static int superpages_enabled = 0;
+static int superpages_enabled = 1;
 SYSCTL_INT(_vm_pmap, OID_AUTO, superpages_enabled,
     CTLFLAG_RDTUN | CTLFLAG_NOFETCH, &superpages_enabled, 0,
     "Are large page mappings enabled?");