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xen-devel
Re: [Xen-devel] [PATCH] Add support for superpages (hugepages) in PV dom
Unfortunately this patch forces user to specify superpages=? in their
config file.
Can we default the behaviour to superpages=0 instead?
Dave McCracken wrote:
> This patch adds the option "superpages" to the domain configuration file. If
> it is set, the domain is populated using 2M pages.
>
> This code does not support fallback to small pages. If the domain can not be
> created with 2M pages, the create will fail.
>
> The patch also includes support for saving and restoring domains with the
> superpage flag set. However, if a domain has freed small pages within its
> physical page array and then extended the array, the restore will fill in
> those freed pages. It will then attempt to allocate more than its memory
> limit and will fail. This is significant because apparently Linux does this
> during boot, thus a freshly booted Linux image can not be saved and restored
> successfully.
>
> Dave McCracken
> Oracle Corp.
>
>
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