On Tuesday 02 March 2004 22:33, Richard Troth wrote:
> The way Linux handles DCSS now,
> you have to tell it to establish page tables for the
> highest address you expect to use, �covering all DCSSs.
> So ... yes, �it handles "holes" in its address space.
> (More than that you'll have to get from the IBMers.)
There is an ongoing discussion about adding support for
hotplugging memory (both adding and removing to/from a
running system) to linux-2.7 and there are patches that
can do this on some other architectures with linux-2.6.
However, this will not be possible with DCSS segments,
because pages in memory segments do not have a usable storage
key (i.e. referenced/change bits).
Some thing that could be done once generic support for
memory hotplug is there is to always give one VM guest
lots of storage and tell Linux to use only a small portion
of that unless you decide to increase the limit later.
Arnd <><
