OA60306: New Function - Add support to the USS syscalls for memory mapping of z/OS UNIX files to use above the bar storage.

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• Support is provided to enhance the USS memory mapping
  syscalls to allow use of above the bar storage and to
  allow map lengths greater than 2 gigabytes.
  The syscalls changed to provide this support are:
  - mmap()  (BPX1MMP/BPX4MMP) Map pages of memory
  - msync() (BPX1MSY/BPX4MSY) Synchronize memory with physical
  storage
  - mprotect() (BPX1MPR/BPX4MPR) Set protection of memory mapping
  - munmap() (BPX1MUN/BPX4MUN) Unmap previously mapped addresses
  Applications will need to be changed to make use of the enhanced
  support.
  The benefits of this enhancement includes:
  - Helping to alleviate below the bar memory constraints by
    allowing applications to use above the bar storage for
    large memory maps.
  - Facilitate accessing large amounts of data at one time,
    potentially improving application performance and simplifying
    data access.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users of z/OS UNIX System Services for HBB77C0           *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * Add support to the USS syscalls for                          *
  * memory mapping of z/OS UNIX files                            *
  * to use above the bar storage and                             *
  * larger map lengths.                                          *
  *                                                              *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Support is provided to enhance the USS memory mapping
  syscalls to allow use of above the bar storage and to
  allow map lengths greater than 2 gigabytes.
  The syscalls changed to provide this support are:
  - mmap()  (BPX1MMP/BPX4MMP) Map pages of memory
  - msync() (BPX1MSY/BPX4MSY) Synchronize memory with physical
  storage
  - mprotect() (BPX1MPR/BPX4MPR) Set protection of memory mapping
  - munmap() (BPX1MUN/BPX4MUN) Unmap previously mapped addresses
  Applications will need to be changed to make use of the enhanced
  support.
  The benefits of this enhancement includes:
  - Helping to alleviate below the bar memory constraints by
    allowing applications to use above the bar storage for
    large memory maps.
  - Facilitate accessing large amounts of data at one time,
    potentially improving application performance and simplifying
    data access.
  

Problem conclusion

Temporary fix

Comments

• A complete description of the documentation updates for this
   APAR is available at:
  http://publibz.boulder.ibm.com/zoslib/pdf/OA60306.pdf
  ×**** PE21/08/23 FIX IN ERROR. SEE APAR OA62016  FOR DESCRIPTION
  

APAR Information

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

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

  UJ90013

Modules/Macros

• BPXFSLIT BPXGYKRT BPXGMQHT BPXGYFX  BPXFRBRI BPXCTFMM BPXGMNAM
  BPXMERNO BPXCTFMW BPXINRIM BPXCLBF  BPXWRTSO BPXRRTRM BPXGYWRT
  BPXGYVIO BPXINPRM BPXINACT BPXPRFVE BPXGYMSY BPXGYVRT BPXWUNIX
  BPXGYFLT BPXVRGEX BPXWREXX BPXGYKWT BPXZOCVT BPXGYMPR BPXGYPFW
  BPXGPPRT BPXGMDAC BPXGYPFR BPXMIMS2 BPXGMDEL BPXGMFST BPXGPDET
  BPXGYVDA BPXYCONS BPXINPVT BPXCFLT  BPXGKSER BPXWREXC BPXINIT1
  BPXGYMPK BPXWRTCM BPXGYMUT BPXGYKVD BPXYERNO BPXYSMFR BPXGYMUN
  BPXWSYSC BPXPRIT  BPXINIT  BPXINDYN BPXGYMMP
  

Fix information

• Fixed component name

  OPENMVS SYS SRV

• Fixed component ID

  5695SCPX1

Applicable component levels

• R7C0 PSY UJ90013

     UP21/04/21 P F104  

Fix is available

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