[Xen-changelog] [xen-unstable] xenpaging: start paging in the middle of gfn range

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Olaf Hering <olaf@xxxxxxxxx>
# Date 1307695643 -7200
# Node ID 1e44e75d889c736c602c4d7a62a7b6c259e3abe5
# Parent  4aaa90c1db4250964f7982fa7c59bf9518988e91
xenpaging: start paging in the middle of gfn range

Set the starting gfn to somewhere in the middle of the gfn range to
avoid paging during BIOS startup. This can speedup booting of a guest.

Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
Committed-by: Ian Jackson <ian.jackson.citrix.com>
---


diff -r 4aaa90c1db42 -r 1e44e75d889c tools/xenpaging/policy_default.c
--- a/tools/xenpaging/policy_default.c  Fri Jun 10 10:47:22 2011 +0200
+++ b/tools/xenpaging/policy_default.c  Fri Jun 10 10:47:23 2011 +0200
@@ -69,6 +69,10 @@
     /* Don't page out page 0 */
     set_bit(0, bitmap);
 
+    /* Start in the middle to avoid paging during BIOS startup */
+    current_gfn = max_pages / 2;
+    current_gfn -= paging->num_pages / 2;
+
     rc = 0;
  out:
     return rc;

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