[Xen-devel] [PATCH] x86: use 'dom0_mem' to limit the number of pages for dom0

[David Vrabel <david.vrabel@xxxxxxxxxx>]

# HG changeset patch
# User David Vrabel <david.vrabel@xxxxxxxxxx>
# Date 1313404957 -3600
# Node ID 1ec6c392d40f37032b0c845094c7ee6ba69740fd
# Parent  8d6edc3d26d26931f3732a2008fb4818bc7bab2d
x86: use 'dom0_mem' to limit the number of pages for dom0

Use the 'dom0_mem' command line option to set the maximum number of
pages for dom0.  dom0 can use then use the XENMEM_maximum_reservation
memory op to automatically find this limit and reduce the size of any
page tables etc.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>

diff -r 8d6edc3d26d2 -r 1ec6c392d40f xen/arch/x86/domain_build.c
--- a/xen/arch/x86/domain_build.c       Sat Aug 13 10:14:58 2011 +0100
+++ b/xen/arch/x86/domain_build.c       Mon Aug 15 11:42:37 2011 +0100
@@ -254,6 +254,8 @@ static unsigned long __init compute_dom0
     }
 #endif
 
+    d->max_pages = min(max_pages, avail);
+
     return nr_pages;
 }
 

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