[Xen-changelog] [xen-unstable] [IA64] domheap: Introduce xenheap_megabytes boot option

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

# HG changeset patch
# User Alex Williamson <alex.williamson@xxxxxx>
# Date 1200596743 25200
# Node ID 0c2dc9424a68cb9a54d2494146ef2ad2ce23c186
# Parent  37a3e770a85c75016da901a24951eca6da9a0b8f
[IA64] domheap: Introduce xenheap_megabytes boot option

Now xenheap size isn't limited by DTR mapping. So we can set it larger size.

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>
---
 xen/arch/ia64/xen/xensetup.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+)

diff -r 37a3e770a85c -r 0c2dc9424a68 xen/arch/ia64/xen/xensetup.c
--- a/xen/arch/ia64/xen/xensetup.c      Thu Jan 17 12:05:43 2008 -0700
+++ b/xen/arch/ia64/xen/xensetup.c      Thu Jan 17 12:05:43 2008 -0700
@@ -75,6 +75,24 @@ unsigned long xen_pstart;
 unsigned long xen_pstart;
 void *xen_pickle_offset __read_mostly;
 
+static void __init parse_xenheap_megabytes(char *s)
+{
+    unsigned long megabytes = parse_size_and_unit(s, NULL);
+
+#define XENHEAP_MEGABYTES_MIN   16
+    if (megabytes < XENHEAP_MEGABYTES_MIN)
+        megabytes = XENHEAP_MEGABYTES_MIN;
+
+#define XENHEAP_MEGABYTES_MAX   4096    /* need more? If so,
+                                           __pickle()/__unpickle() must be
+                                           revised. */
+    if (megabytes > XENHEAP_MEGABYTES_MAX)
+        megabytes = XENHEAP_MEGABYTES_MAX;
+
+    xenheap_size =  megabytes * 1024 * 1024;
+}
+custom_param("xenheap_megabytes", parse_xenheap_megabytes);
+
 static int __init
 xen_count_pages(u64 start, u64 end, void *arg)
 {

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