PODBK

Prolog  

Control Block Contents  
   PODBK DSECT

Storage Layout  

Cross Reference (Contains links to field and bit definitions)  

PODBK Prolog

 NAME       : HCPPODBK
 DESCRIPTION: Relocation Pages on DASD Block
 DSECT      : PODBK
 FUNCTION   : A Relocation Pages on DASD block will hold information
              about the pages from DASD that will be sent from the
              source to the destination during relocation.
 LOCATED BY : PODBKs are queued in a gated queue that is anchored
              at RLOBK.RLOPODGQ. Each relocation will have a separate
              gated queue.  The first two fullwords of the gated
              queue field point to the first and last WORKITEM
              (HCPPODBK).
 CREATED BY : A Relocation Pages on DASD block is allocated by
              HCPPODNQ and HCPPODPW in HCPPOD.
 DELETED BY : A Relocation Pages on DASD block is released by
              HCPPODDQ and/or HCPPODSQ in HCPPOD.
 REFERENCES : See HCPPOD for information about the usage of this
              block.
              See HCPPOD for information about the role that this
              block plays in PGMBK Walker (HCPRLTPW) throttling.
 SERIALIZED : The queueing and dequeing of PODBKs are serialized by
              the gated queue macro (HCPGQMGR).
 RELOCATION CONSIDERATIONS : - This block is not relocated during a relocation of a
              guest from one system to another.
              - During a relocation, one PODBK is created for each
              guest page that is on DASD and needs to be sent to
              the destination system.
 NOTES      : There are two flavors of HCPPODBKs.
              1.- Contains a PTE from a page on DASD that
              relocation needs to send.
              2.- Contains a Post-And-Wait message to notify
              HCPPODDQ that the complete address space was
              processed for the current relocation memory
              pass.
              DSECT USED AS WORKING ELEMENT FOR THE GATED QUEUE MANAGER
              (If FLAG not set, then PODBK is defined as follows)
              +------+------+------+------+------+------+------+------+
              | NEXT ELEMT IN GATED QUEUE | FLAG |  RESERVED FOR IBM  |
              +------+------+------+------+------+------+------+------+
              |                  PTE FOR PAGE ON DASD                 |
              +------+------+------+------+------+------+------+------+
              |    ADDRESS OF THE RLOBK   |      RESERVED FOR IBM     |
              +------+------+------+------+------+------+------+------+
              (If FLAG is set to PODNOTIFY, then PODBK is defined as
              follows)
              +------+------+------+------+------+------+------+------+
              | NEXT ELEM IN GATED QUEUE  | FLAG |  RESERVED FOR IBM  |
              +------+------+------+------+------+------+------+------+
              |   RESERVED FOR IBM USE    | CPEBK TASK FOR POST & WAIT|
              +------+------+------+------+------+------+------+------+
              |    ADDRESS OF THE RLOBK   |      RESERVED FOR IBM     |
              +------+------+------+------+------+------+------+------+

PODBK Control Block Content

PODBK DSECT

Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      PODBK          Relocation Pages on DASD Block
0000    0 Address      4 PODNEXT        Reserved for Gated Queue Manager
                                        for use as a queue chain pointer
0004    4 Bitstring    1 PODFLAG        Work element flag
          00000080       PODNOTIFY      X'80' PODNOTIFY This work element
                                        is for notification processing.
                                        >>>> BEGIN DEBUG ONLY
                                        CODE <<<< This debug
                                        only code is taking part of the
                                        reserved space. >>>>
                                        END DEBUG ONLY CODE
                                        <<<<
0005    5 Bitstring    1 * (3)          Reserved for future IBM use.
0008    8 Address      8 PODPTE         PTE for page on DASD.
0010   16 Address      4 PODRLO         Address of the RLOBK related to
                                        this PTE
0014   20 Address      4 PODPWI         Address of PWIBK
          00000003       PODDSIZE       ((*-PODBK)+7)/8 PODBK size in
                                        double-words
          00000018       PODBSIZE       PODDSIZE*8 size in bytes
0008    8 Address      4 *              Reserved for future IBM use.
000C   12 Address      4 PODPOST        CPEBK address to stack when this
                                        work element is processed.

PODBK Storage Layout

          
*** PODBK - Relocation Pages on DASD Block
*
*     +---------------------------+------+--------------------+
*   0 |         PODNEXT           |:FLAG |////////////////////|
*     +---------------------------+------+--------------------+
*   8 |                        PODPTE                         |
*     +---------------------------+---------------------------+
*  10 |          PODRLO           |          PODPWI           |
*     +---------------------------+---------------------------+
*  18
*
*** PODBK - Relocation Pages on DASD Block
          
*** Overlay for PODPTE in PODBK
*
*     +---------------------------+---------------------------+
*   8 |///////////////////////////|         PODPOST           |
*     +---------------------------+---------------------------+
*  10
*
*** Overlay for PODPTE in PODBK

PODBK Cross Reference

Symbol         Dspl Value
-------------- ---- -----
PODBSIZE       0014 00000018
PODDSIZE       0014 00000003
PODFLAG        0004
PODNEXT        0000
PODNOTIFY      0004 00000080
PODPOST        000C
PODPTE         0008
PODPWI         0014
PODRLO         0010