ca.portal.admin

Re:question about numbered user exits

Discussion created by ca.portal.admin on Oct 18, 2010
I am reading Chris Hoelscher's article on z/IIP exploitation in the
September 2010 ""IUA Connections"" with great interest as our site
experienced the problem that he describes. Chris indicates that the
numbered user exits can contribute to TCB/SRB swapping. We use exit 28
(security pre-processing) and I am wondering if this could account for
some of the high swapping rate that we saw.

Here is my question: Is there any way to determine how many times a
numbered user exit is actually being executed?

Kay Rozeboom
State of Iowa
Information Technology Enterprise
Department of Administrative Services
Telephone: 515.281.6139 Fax: 515.281.6137
Email: Kay.Rozeboom@Iowa.Gov
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Re: question about numbered user exits
"In a wholly uninformed and speculative way, I wonder about this . . .
That is, I have no idea how to count user-exit calls, but ...
If a user-exit is in SYSTEM mode, would it swap from TCB to PRB mode?
And anyway, wouldn't the ADSO volume of swaps swamp a user-exit?
We use Exits 2, 21, 20, 22, but all of them only in specialized
situations, not-for-every-task, but fairly often ... and what about the
Exit 17 & 18 stubs? Would those cause a swap everytime? What about
Database Procedures, too?

It's a poser, alright.

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