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From: Jamie Lokier <jamie@shareable.org>
Subject: Re: [Qemu-devel] Re: [PATCH 1/6] Use correct types to enable > 2G
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To: qemu-devel@nongnu.org

Robert William Fuller wrote:
> Linux doesn't commit mapped memory until it's faulted.  As for other 
> platforms, who knows?

Correction: most Linux installations don't commit mapped memory until
it's faulted.  A few do, as a matter of policy (it depends on kernel
settings), so that applications won't randomly crash when too much
memory is faulted, but will return 0 from malloc() earlier.

For those few systems, use MAP_NORESERVE if you still need to allocate
the address space.

-- Jamie