Re: objrmap and vmtruncate

Ingo Molnar
2003-04-22T15:09:53Z

On Tue, 22 Apr 2003, Martin J. Bligh wrote:

> Oh, BTW. You're assuming no sharing of any pages in the above. Look what
> happens if 1000 processes share the same page ...

i'm not assuming anything - this is the per-process overhead.

processes have well-known RAM overhead associated to the size (and
fragmentation) of their virtual memory space, primarily caused by
pagetables. My suggestion triples this cost [where pte chains double the
costs], but leaves the scaling factor and generic characteristics the
same.

Ingo