In <[EMAIL PROTECTED]>, on
08/22/2006
at 11:57 AM, "Craddock, Chris" <[EMAIL PROTECTED]> said:
>There is no expanded storage in z/Architecture. However, DREF is
>still valid
No; see below.
>OTOH, the same amount of DREF would not be backed unless/until you
>actually touched it,
DREF is more than allocate on first use. DREF includes backing dirty
pages somewhere that involves no I/O to retrieve, and that facility is
history.
>PC and SVC routines are the right mechanism for wrapping privileged
>logic, but they often need to apply some installation-defined
>criteria to whether the caller's intended access is permitted or
>not.
If you set things up so that you do your SAF calls as part of
establishing the PC entry, then the overhead should be minimal.
--
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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