Programming Interface Information: This information is NOT intended to be
used as Programming Interfaces of z/VM.

HFOBK

Prolog
Control Block Contents
HFOBK DSECT
Storage Layout
Cross Reference

HFOBK Prolog

 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
 NOTES      : none
 

HFOBK Control Block Content

HFOBK DSECT

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
 

HFOBK Storage Layout

          
*** 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

Symbol         Dspl Value
-------------- ---- -----
HFO$END        0004 00000008
HFOCNTIO       0004
HFOCOUNT       0000
This information is based on z/VM V3R1.0.
Last updated on 30 Mar 2001 at 08:02:03 EDT.
Copyright IBM Corporation, 1990, 2001