Re: A question about anonymous page

[Hugh Dickins]

On Fri, 14 Jan 2005, Hsu I-Chieh wrote:
> 
> I want to know if there is any condition that anonymous pages (allocated by 
> do_anonymous_page) may be mapped in process page tables two or more times.

An anonymous page mapped at different places in a single user address space?
No (except for the reserved zero page, used on read fault).  But mapped into
different user address spaces, forked off from a common ancestor?  Yes (and
might even be at different positions if mremap has been used to move some).

Unless we have a bug - why do you ask?

Hugh

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