Messages in this thread |  | | | Date | Wed, 22 Dec 2010 12:47:28 -0500 | | From | Konrad Rzeszutek Wilk <> | | Subject | Re: [Xen-devel] [PATCH 07/10] xen/mmu: Work with 1-1 mappings when allocating new top/middle entries. |
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On Wed, Dec 22, 2010 at 08:54:31AM +0000, Ian Campbell wrote: > On Tue, 2010-12-21 at 21:37 +0000, Konrad Rzeszutek Wilk wrote: > > We were not properly taking under advisement the 1-1 mappings > > when a large area of memory was ballooned out. > Are we lazily allocating the p2m tree nodes for regions initially > covered by the balloon? (perhaps we have always done this and it isn't > new with this series)
Before: Yes Now: Yes. > > Would it be simpley to always populate enough tree nodes to cover the > ballooned area as well as nr_pages at start of day and therefore avoid > worrying about it later on (except for memory hotplug which is special > in this way already)?
Tried that, ran out of reserved_brk space :-) But not sure what we would gain for this - it is not always guaranteed that we will populate up to the memory 'maxmem' region.
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