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MF63096 - LIC-OTHER-WAIT RESIDENT STACKS WAIT DURING IASP ADDRESS COMP

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PTF ( Program Temporary Fixes ) Cover letter


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Abstract

LIC-OTHER-WAIT RESIDENT STACKS WAIT DURING IASP ADDRESS COMP


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED      PTF/FIX  LEVEL

TYPE PROGRAM  REL  NUMBER   MIN/MAX  OPTION
---- -------- ---  -------  -------  ------
TR   5770999  710  MF99011   00/00    0000



NOTICE:
-------
Application of this PTF may disable or render ineffective programs that
use system memory addresses not generated by the IBM translator,
including programs that circumvent control technology designed to limit
interactive capacity to purchased levels.  This PTF may be a prerequisite
for future PTFs.  By applying this PTF you authorize and agree to the
foregoing.

This PTF is subject to the terms of the 'IBM License Agreement for Machine
Code', the terms of which were provided in a printed document that was
delivered with the machine.

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REGARDING THE PTF.





APAR Error Description / Circumvention

-----------------------------------------------
In the primary instance of this wait condition, SWA (Save While
Active) was running against IASP data.

Many jobs stuck waiting on IASP resident stacks. The resident
stacks are waiting on a SWA insert to complete. Due to memory
constraints the SWA insert tasks were taking a page fault which
had to be looked up in the IASP permanent directory.  Getting
the lock on a permanent directory page caused an address compare
to happen which is gets stuck waiting on the SWA stacks.

Service keywords:
resstackpool -i
SMSWAINSxx tasks
SmSaveWhileActiveNucleus

CORRECTION FOR APAR MA44526 :
-----------------------------
We will avoid turning on the address compare flag for the IASP
permanent directory pages.

CIRCUMVENTION FOR APAR MA44526 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


None.


Default Instructions

THIS IS A DELAYED PTF TO BE APPLIED AT IPL TIME.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
     NONE

Summary Information

System..............................i
Models..............................
Release.............................V7R1M0
Licensed Program...............5770999
APAR Fixed..........................View details for APAR MA44526
Superseded by:......................
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C7192710


System i Support

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Document Information

Modified date:
09 February 2017