[libvirt] [PATCH] Qemu: ask for memory preallocation with large pages

Daniel Veillard veillard at redhat.com
Fri Jan 8 11:18:27 UTC 2010

On Thu, Jan 07, 2010 at 05:31:59PM +0000, Daniel P. Berrange wrote:
> On Thu, Jan 07, 2010 at 02:53:20PM +0100, Daniel Veillard wrote:
> > The -mem-prealloc flag should be used when using large pages
> > This ensures qemu tries to allocate all required memory immediately,
> > rather than when first used. The latter mode will crash qemu
> > if hugepages aren't available when accessed, while the former
> > should gracefully fallback to non-hugepages.
> > 
> > * src/qemu/qemu_conf.c: add -mem-prealloc flag to qemu command line
> >   when using large pages
> ACK, definitely don't want VMs crashing when attempting to page in
> huge pages which don't exist anymore

  okay, pushed,


Daniel Veillard      | libxml Gnome XML XSLT toolkit  http://xmlsoft.org/
daniel at veillard.com  | Rpmfind RPM search engine http://rpmfind.net/
http://veillard.com/ | virtualization library  http://libvirt.org/

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