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Prolog 
Control Block Contents 
   HFOBK DSECT
Storage Layout 
Cross Reference (Contains links to field and bit definitions)
Programming Interface Information:
This information is NOT intended to be
used as Programming Interfaces of z/VM.


  HFOBK Prolog Top of page
  
 NAME       : HCPHFOBK
 DESCRIPTION: Monitor I/O Domain Hi-Frequency Sample Data Area
 DSECT      : HFOBK
 FUNCTION   : Control block for I/O-domain high-frequency
              sample data.  There is a separate HCPHFOBK for
              each I/O device that is being sampled. Data collected
              here are later transferred to the I/O domain monitor
              record, MRIODDEV.
 LOCATED BY : RDEVHFSD
 CREATED BY : HCPMOOIN
 DELETED BY : HCPMOOTM
 REFERENCES : none
 SERIALIZED : RDEVHFLK lockword in the I/O device's respective RDEV
 RELOCATION CONSIDERATIONS : None
 COMPATIBILITY AND MIGRATION CONCERNS : none
 
 
  HFOBK Control Block Content Top of page
  




 HFOBK DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      HFOBK          Monitor I/O Domain Hi-Frequency Sample Data Area
0000    0 Signed       4 HFOCOUNT       Number of samples
0004    4 Signed       4 HFOCNTIO       Number of queued SSCH requests,
                                        excluding the active requests
                                        from field RDEVCTIO
          00000008       HFO$END        * End of HFOBK
          00000001       HFOSIZE        (HFO$END-HFOBK+7)/8 HFOBK size in
                                        doublewords
 
 
  HFOBK Storage Layout Top of page
  
          
*** HFOBK - Monitor I/O Domain Hi-Frequency Sample Data Area
*
*     +---------------------------+---------------------------+
*   0 |         HFOCOUNT          |         HFOCNTIO          |
*     +---------------------------+---------------------------+
*   8
*
*** HFOBK - Monitor I/O Domain Hi-Frequency Sample Data Area
 
 
  HFOBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
HFO$END        0004 00000008
HFOCNTIO       0004
HFOCOUNT       0000
HFOSIZE        0004 00000001
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:51:08 EDT.
Copyright IBM Corporation, 1990, 2022