Re: [Xen-devel] [PATCH] Add support for superpages (hugepages) in PV domain

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

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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