In <listserv%[email protected]>, on 06/02/2011
at 06:56 PM, Paul Gilmartin <[email protected]> said:
>Is this a hardware feature?
That depends upon what "it" is.
>If not, I could envision doing it in software: point the page table
>entry at a physical page containing zeroes; widely shared, and
>entirely write-protected. Then a protection exception could be
>handled as if it were a page fault.
Why not mark the page as invalid and treat the page fault as a page
fault? Prezeroing new page frames does not require the full generality
of copy-on-write.
--
Shmuel (Seymour J.) Metz, SysProg and JOAT
ISO position; see <http://patriot.net/~shmuel/resume/brief.html>
We don't care. We don't have to care, we're Congress.
(S877: The Shut up and Eat Your spam act of 2003)
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