On Mon, May 30, 2011 at 2:49 PM, Ingo Molnar <mingo@xxxxxxx> wrote:
> [*] Would be nice if tools/kvm/ had a debug option to simulate 'lots
> of RAM' as well somehow - perhaps by not pre-initializing it and
> somehow catching all-zeroes pages and keeping them all zeroes and
> shared? It would obviously OOM after some time but would allow me
> to at least boot a fair deal of userspace. The motivation is that
> i have recently received a 1 TB RAM bugreport. 1 TB of RAM mapped
> with 2MB mappings should still be able to boot to shell on a 32
> GB RAM testbox of mine, and survive there for some time. We could
> even do some kernel modifications to make this kind of simulation
> easier.
Doesn't our mmap() overcommit work for you? IIRC, Sasha booted guests
with huge amounts of overcommitted RAM.
Pekka
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