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SubjectRe: address space reservation functionality?
FromArjan van de Ven <>
DateTue, 11 Jan 2005 08:42:42 +0100
On Mon, 2005-01-10 at 15:52 -0500, Robert W. Fuller wrote:
> Hi,
>
> I was wondering if some functionality existed in Linux. Specifically,
> in Solaris, you can mmap the null device in order to reserve part of the
> address space without otherwise consuming resources. This is detailed
> in the Solaris manpage null(7D). The same functionality is also
> available under Windows NT/XP/2K by calling the VirtualAlloc function
> with the MEM_RESERVE flag omitting the MEM_COMMIT flag. Does Linux have
> a similar mechanism buried somewhere whereby I can reserve a part of the
> address space and not increase the "virtual size" of the process or the
> system's idea of the amount of memory in use? I could not find one by
> using the source.

malloc() already does this...
what you describe is the default behavior of linux; only when you
actually write to the memory does it get backed by ram.

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