Messages in this thread | | | Date | Mon, 18 Nov 2002 08:24:37 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: [patch] threading fix, tid-2.5.47-A3 |
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On 18 Nov 2002, Alan Cox wrote: > > 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 ?
It literally means to not copy that VMA _at_all_. Basically, the mapping simply won't show up in the child. It's kind of the mapping equivalent of close-on-exec..
NOTE! Ingo - you might want to check with the shared-page-table people about this, I remember us talking about discontinuing the feature because it makes shared page tables harder to implement. Other than that it's a trivial feature.
Linus
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