[Xen-changelog] [xen-unstable] libxl: drop 8M slack for PV guests.

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Ian Campbell <ian.campbell@xxxxxxxxxx>
# Date 1330604774 0
# Node ID 0f0f126f4a99a35a89f6136c74a046ababfd7645
# Parent  2d194ff3b459c9e5a8d2adc499f69fd840814bd7
libxl: drop 8M slack for PV guests.

This serves no purpose. It relates to the old 8M to "account for backend
allocations" which we used to add. This leaves a bit of unpopulated space in
the Pseudo-physical address space which can be used by backends when mapping
foreign memory. However 8M is not representative of that any more and modern
kernels do not operate in this way anyway.

I suspect an argument could be made for removing this from the libxl API
altogether but instead lets just set the overhead to 0.

Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---


diff -r 2d194ff3b459 -r 0f0f126f4a99 tools/libxl/libxl_create.c
--- a/tools/libxl/libxl_create.c        Thu Mar 01 12:26:13 2012 +0000
+++ b/tools/libxl/libxl_create.c        Thu Mar 01 12:26:14 2012 +0000
@@ -108,7 +108,7 @@
         b_info->u.hvm.xen_platform_pci = 1;
         break;
     case LIBXL_DOMAIN_TYPE_PV:
-        b_info->u.pv.slack_memkb = 8 * 1024;
+        b_info->u.pv.slack_memkb = 0;
         break;
     default:
         abort();

_______________________________________________
Xen-changelog mailing list
Xen-changelog@xxxxxxxxxxxxx
http://lists.xensource.com/xen-changelog