[Xen-changelog] [xen-unstable] [XEN] Reduce default maximum allocation order from 2^20 pages to 2^11.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 4f1e39ec05d6ec711f9ba4a66a3653ed3e168311
# Parent  2db7b3627da4d38134ba0cfd740ce3ee73c3865e
[XEN] Reduce default maximum allocation order from 2^20 pages to 2^11.
On x86 this corresponds to a maximum aligned contiguous allocation of 8MB.
This can be overridden by architectures if need be.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
 xen/include/xen/mm.h |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff -r 2db7b3627da4 -r 4f1e39ec05d6 xen/include/xen/mm.h
--- a/xen/include/xen/mm.h      Thu Jun 08 16:48:23 2006 +0100
+++ b/xen/include/xen/mm.h      Thu Jun 08 16:51:39 2006 +0100
@@ -68,8 +68,11 @@ unsigned long avail_domheap_pages(void);
 
 #define ALLOC_DOM_DMA 1
 
-/* Up to 2^20 pages can be allocated at once. */
-#define MAX_ORDER 20
+#ifdef CONFIG_PAGEALLOC_MAX_ORDER
+#define MAX_ORDER CONFIG_PAGEALLOC_MAX_ORDER
+#else
+#define MAX_ORDER 11 /* 2^11 contiguous pages */
+#endif
 
 /* Automatic page scrubbing for dead domains. */
 extern struct list_head page_scrub_list;

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