[Xen-ia64-devel] [PATCH 15/16] domheap: introduce xenheap_megabytes boot option.

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

# HG changeset patch
# User yamahata@xxxxxxxxxxxxx
# Date 1198815094 -32400
# Node ID 70146eb02f8aa77424e5a5e9471fd223ba21b6af
# Parent  c5d178b2c54fb2dda200a1abb0bf49671378bd02
introduce xenheap_megabytes boot option.
Now xenheap size isn't limited by DTR mapping. So we can set it larger size.
PATCHNAME: xenheap_megabytes

Signed-off-by: Isaku Yamahata <yamahata@xxxxxxxxxxxxx>

diff -r c5d178b2c54f -r 70146eb02f8a xen/arch/ia64/xen/xensetup.c
--- a/xen/arch/ia64/xen/xensetup.c      Wed Dec 26 16:42:19 2007 +0900
+++ b/xen/arch/ia64/xen/xensetup.c      Fri Dec 28 13:11:34 2007 +0900
@@ -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)
 {

Attachment: 16709_70146eb02f8a_xenheap_megabytes.patch
Description: Text Data

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