I would naïvely expect MODE=HOME to cause fewer hit rather than causing more.


--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3

________________________________________
From: IBM Mainframe Discussion List [[email protected]] on behalf of 
Peter Relson [[email protected]]
Sent: Saturday, June 11, 2022 8:33 AM
To: [email protected]
Subject: Re: SLIP IF not working

<snip>
but I would have thought specifying JOBNAME would be enough to avoid the 
situation
</snip>

An understandable, but incorrect/incomplete, thought.

The implementation covers such cases as where a program in address space A PC's 
to address space B and it is within address space B that the system found MOD1.

Jobname applies to a workunit whether that work unit is running in the address 
space of the job where it started or with an alternate primary address space 
when following the chain of space-switch PC. The home address space remains the 
same.

Since SLIP has no idea that you want to avoid this case (which MODE=HOME would 
so indicate) it treats finding MOD1 in any address space as having found a copy 
to use.

Peter Relson
z/OS Core Technology Design


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