Jan Beulich
2010-Mar-11 16:44 UTC
[Xen-devel] [PATCH] x86: adjust available memory calculation for Dom0 construction
With a large number of CPUs, the amount of memory needed to construct
the vCPU structures for Dom0 becomes significant and hence should be
accounted for when calculating the amount of memory to pass to Dom0.
Signed-off-by: Jan Beulich <jbeulich@novell.com>
--- 2010-03-09.orig/xen/arch/x86/domain_build.c 2010-03-09 00:00:00.000000000
+0100
+++ 2010-03-09/xen/arch/x86/domain_build.c 2010-03-10 16:49:52.000000000 +0100
@@ -155,6 +155,13 @@ static unsigned long __init compute_dom0
unsigned long min_pages = dom0_min_nrpages;
unsigned long max_pages = dom0_max_nrpages;
+ avail -= (opt_dom0_max_vcpus - 1UL)
+ << get_order_from_bytes(sizeof(struct vcpu));
+#ifdef __x86_64__
+ if ( sizeof_long == sizeof(int) )
+ avail -= opt_dom0_max_vcpus - 1;
+#endif
+
/*
* If domain 0 allocation isn''t specified, reserve 1/16th of
available
* memory for things like DMA buffers. This reservation is clamped to
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel