Re: [RFC] Arch option to touch newly allocated pages

Jeff Dike
2002-03-06T20:24:32Z

alan@lxorguk.ukuu.org.uk said:
> Doesn't seem to but it looks like madvise might be enough to make that
> happen.

Yeah, MADV_DONTNEED looks right. UML and Linux/s390 (assuming VM has the
equivalent of MADV_DONTNEED) would need a hook in free_pages to make that
happen.

> That BTW is an issue for more than UML - it has a bearing on running
> lots of Linux instances on any supervisor/virtualising system like S/390

On a side note, the "unused memory is wasted memory" behavior that UML and
Linux/s390 inherit is also less than optimal for the host.

Jeff