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PI84889: WLM CLASSIFICATION OF IMS TRANSACTION BY IMS TRANSACTION CLASS NOT ALWAYS CONSIDERED 17/08/25 PTF PEREMOVE

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Observing incorrect assignment of WLM Service and Report Classes
    based on IMS Transaction Classes.
    -
    Over 50% of all IMS Transactions covered by IMS Default Service
    and Report Class instead of the current configured
    Classification policy defined by WLM.
    

Local fix

  • no
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All users of IMS v15 QPP                                     *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * 1.  WLM service classes for IMS transactions may be assigned *
    * incorrectly.                                                 *
    * 2.  Incorrect data in 56FA log record due to overlay of      *
    * DFSTLS block.                                                *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * INSTALL CORRECTIVE SERVICE FOR APAR/PTF                      *
    ****************************************************************
    Two issues are addressed in this apar.
    1.   In DFSYTIB0, the service class may be reported incorrectly
    to WLM.  This occurs because the expansion of the DFSWLMY macro
    uses R13 as a base register for SMBCLASS_PTR, even though, at
    this point in the code, R13 is being used to point to a save
    area to be used by WLM.
    
    2.  An incorrect length is used for the DFSTLS block.  In some
    cases, a length of 218x is used instead of the correct length of
    260x.  WLM Mobile Pricing increased the length of the block from
    218x to 260x.  This results in an overlay of the section of
    DFSTLS beyond offset 218x.  Because this is the section added
    for WLM Mobile Pricing, used to store processor usage data, this
    can cause incorrect processor usage data to be written to the
    56FA log record and/or reported to WLM on the DFSWLMN service
    call.
    

Problem conclusion

  • 1.  In implementing WLM Mobile Pricing, we needed to change the
    handling of save areas in DFSYTIB0 to account for the fact that
    the 64 bit version of the WLM Classify service (IWM4CLSY)
    expects r13 to point to a 216-byte save area.  This was
    accomplished by temporarily copying the dynamic storage address
    in r13 to r9 across the DFSWLMY call, and having r13 point to
    the 216 byte save area.  The problem this introduces is that the
    compiler used r13 as a base register for SMBCLASS_PTR in the
    DFSWLMY macro expansion, when r13 is no longer pointing to the
    dynamic storage area.
    
    This is fixed by adding a USING statement in gen code to tell
    the assembler that R9, not R13, contains the address of the
    dynamic storage area during the DFSWLMY call.
    
    2.  The DFSTLS length is incorrect because some modules that
    reference TLSLEN were not recompiled for WLM Mobile Pricing.
    Those modules are recompiled by this APAR.  They are:
    DFSCDMP0
    DFSDTTA0
    DFSSDA30
    DFSMINI0
    DFSPSTB0
    DFSTMAS0
    DFSSDA20
    DFSABND0
    DFSFDMP0
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI84889

  • Reported component name

    IMS V15

  • Reported component ID

    5635A0600

  • Reported release

    500

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-07-24

  • Closed date

    2017-08-17

  • Last modified date

    2017-10-06

  • APAR is sysrouted FROM one or more of the following:

    PI84838

  • APAR is sysrouted TO one or more of the following:

    UI49648

Modules/Macros

  • DFSYTIB0 DFSABND0 DFSPSTB0 DFSSDA20 DFSSDA30 DFSCDMP0 DFSMINI0
    DFSTMAS0 DFSDTTA0 DFSFDMP0
    

Fix information

  • Fixed component name

    IMS V15

  • Fixed component ID

    5635A0600

Applicable component levels

  • R500 PSY UI49648

       UP17/08/31 P F708

Fix is available

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Document Information

Modified date:
06 October 2017