Attachment 148801 Details for Bug 220592 – RHEL5 Patch: auto-limit dom0 memory allocation to 32G

[patch] RHEL5 Patch: auto-limit dom0 memory allocation to 32G

xen-auto-limit-dom0-32G-2.patch (text/plain), 1.81 KB, created by Chris Lalancette on 2007-02-26 15:54:09 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Chris Lalancette

Created: 2007-02-26 15:54:09 UTC

Size: 1.81 KB

patch

obsolete

>diff -urp xen.patched/arch/x86/domain_build.c xen/arch/x86/domain_build.c
>--- xen.patched/arch/x86/domain_build.c	2006-10-16 16:07:15.000000000 -0400
>+++ xen/arch/x86/domain_build.c	2007-02-23 14:52:34.000000000 -0500
>@@ -269,23 +269,30 @@ int construct_dom0(struct domain *d,
> 
>     d->max_pages = ~0U;
> 
>-    /*
>-     * If domain 0 allocation isn't specified, reserve 1/16th of available
>-     * memory for things like DMA buffers. This reservation is clamped to 
>-     * a maximum of 128MB.
>-     */
>     if ( dom0_nrpages == 0 )
>     {
>+        /*
>+         * If domain 0 allocation isn't specified, reserve 1/16th of available
>+         * memory for things like DMA buffers. This reservation is clamped to 
>+         * a maximum of 128MB.
>+         */
>         dom0_nrpages = avail_domheap_pages() + initial_images_nrpages();
>         dom0_nrpages = min(dom0_nrpages / 16, 128L << (20 - PAGE_SHIFT));
>-        dom0_nrpages = -dom0_nrpages;
>+        nr_pages = avail_domheap_pages() + initial_images_nrpages() -
>+            dom0_nrpages;
>+        /*
>+         * On systems with >= 64GB the DMA heap is not always large enough
>+         * to start up a full sized dom0.  Since people will be carving up
>+         * such systems into virtual machines anyway, limit dom0 to 32GB.
>+         */
>+        nr_pages = min(nr_pages, 32UL << (30 - PAGE_SHIFT));
>     }
>-
>-    /* Negative memory specification means "all memory - specified amount". */
>-    if ( dom0_nrpages < 0 )
>+    else if ( dom0_nrpages < 0 )
>+        /* Negative memory specification means "all memory - specified amount". */
>         nr_pages = avail_domheap_pages() + initial_images_nrpages() +
>             dom0_nrpages;
>     else
>+        /* The user specified a dom0_mem= option. Do not override. */
>         nr_pages = dom0_nrpages;
> 
>     if ( (rc = parseelfimage(&dsi)) != 0 )

Actions: View | Diff

Attachments on bug 220592: 144270 | 144362 | 144363 | 144364 | 144387 | 145875 | 145914 | 145966 | 145968 | 148554 | 148800 | 148801