Messages in this thread | | | Subject | Re: [patch] threading fix, tid-2.5.47-A3 | From | Alan Cox <> | Date | 18 Nov 2002 13:20:19 +0000 |
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On Mon, 2002-11-18 at 12:26, Ingo Molnar wrote: > > and we have VM_DONTCOPY already, which is used by the DRM code. So it > would only be a question of exporting this API to userspace. The attached > patch adds MAP_DONTCOPY. I made it unpriviledged, i doubt it has any > security impact.
What is the behaviour of someone setting VM_DONTCOPY on memory that was copy on write between a large number of processes (say an executable image) ? Don't copy - but don't copy from what, from the original mapping or from the COW mapping of the original mapping ?
Alan
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