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SubjectRe: Interesting VM feature?
Mike Fedyk wrote:
> On Fri, Aug 15, 2003 at 02:56:02PM -0500, mouschi@wi.rr.com wrote:
> > Is madvise required to result in zero filled pages
> > by a standard, or is this just the commonly accepted
> > behavior?
>
> I believe it is the standard for clean pages, though someone else will have
> to point out where...

That's the answer to a different question.

The unanswered question is: what should madvise(MADV_DONTNEED) do,
given dirty pages?

man madvise(*) says that it zero-fills anonymous private mappings, and
restores private file-backed mappings to the original file pages.

That is not surprising, as the CPU-friendly semantic is more
complicated to implement, needing an extra flag in the page table
(or rmap structure).

-- Jamie
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