Re: [patch] threading fix, tid-2.5.47-A3

From: Ingo Molnar (mingo@elte.hu)
Date: Mon Nov 18 2002 - 11:42:58 EST


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 would result in a VM 'hole' - completely unmapped virtual memory with
no vma backing it.

        Ingo

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