DSUBK Back to Index page
 
Prolog 
Control Block Contents 
   DSUBK 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.

 
  DSUBK Control Block Content Top of page
  




 DSUBK DSECT
Top of page


Hex   Dec Type/Val   Lng Label (dup)    Comments
---- ---- --------- ---- -------------- --------
0000    0 Structure      DSUBK          Demand Scan User Data Block
0000    0 Address      4 DSUNEXT        Forward pointer to next DSUBK
          00000004       DSUClr         * Area to clear before use
0004    4 Address      4 DSUVMDBK       Addr of VMDBK being processed
0008    8 Character    8 DSUSERID       User being processed
0010   16 Dbl-Word     8 DSUSTART       Timestamp of user scan start
0018   24 Signed       4 DSUSTACT       Before DS: Active list length
001C   28 Signed       4 DSUSTIBR       Before DS: IBR list length
0020   32 Signed       4 DSUSTOLE       Number stolen from IBR list
0024   36 Signed       4 DSURQI2H       Total number requeued from
                                        IBR->active
0028   40 Signed       4 DSURQIHV       # requeued IBR->act b/c valid
002C   44 Signed       4 DSURQIHS       # requeued IBR->act b/c
                                        serializ
0030   48 Signed       4 DSURQIHL       # requeued IBR->act b/c locked
0034   52 Signed       4 DSUINVD        Number invalidated from act list
0038   56 Signed       4 DSURQH2H       Total number requeued from active
                                        to top of active
003C   60 Signed       4 DSURQHHS       # requeued act->act b/c
                                        serializ
0040   64 Signed       4 DSURQHHL       # requeued act->act b/c locked
0044   68 Signed       4 DSUENACT       After DS: act list length
0048   72 Signed       4 DSUENIBR       After DS: IBR list length
004C   76 Bitstring    1 DSUSKPFL       Reason flags for why skipped
          1... ....      DSUNOPTX       X'80' DSUNOPTX Couldn't get
                                        PTIL-x
          .1.. ....      DSUNOPTS       X'40' DSUNOPTS Couldn't get
                                        PTIL-s either
          ..1. ....      DSUNOSHD       X'20' DSUNOSHD Couldn't get
                                        shadow table lock
          ...1 ....      DSUNOUFO       X'10' DSUNOUFO Couldn't get UFO
                                        lock
          .... 1...      DSUSYS         X'08' DSUSYS Skipped because
                                        SYSTEM VMDBK
          .... .1..      DSULOCKS       X'04' DSULOCKS Skipped b/c too
                                        many locked pgs
          .... ..1.      DSUVMDLO       X'02' DSUVMDLO Skipped because
                                        VMDLOGON/VMDLOGOF
          .... ...1      DSUNOSPC       X'01' DSUNOSPC Skipped because
                                        VMDASCBK=0
004D   77 Bitstring    1 DSUENDFL       Reason flag for why we stopped
                                        scanning this guest
          1... ....      DSUEMSFX       X'80' DSUEMSFX Reached max steal
                                        factor
          .1.. ....      DSUERSRV       X'40' DSUERSRV RESERVED boundary
          ..1. ....      DSUEWRQD       X'20' DSUEWRQD Back to first
                                        requeued
          ...1 ....      DSUEIBRX       X'10' DSUEIBRX IBR section empty
          .... 1...      DSUEMET        X'08' DSUEMET Need was met
          .... .1..      DSUEIBR        X'04' DSUEIBR IBRDONE was on
004E   78 Signed       2 DSUSHVAL       Shadow table lock value when we
                                        couldn't get it
0050   80 Dbl-Word     8 DSUENDTM       Timestamp of user scan end
0058   88 Address      8 DS1STRQH       1st FRMTE requeued to act sect.
0060   96 Address      8 DS1STRQI       1st FRMTE requeued to IBR sect.
0068  104 Signed       8 DSUAGCST       Aging List count at start
0070  112 Signed       4 DSUAGFLI       Aging List ct in flight at start
0074  116 Signed       4 DSUAGRCL       Aging List ct reclaimable
0078  120 Signed       8 DSUAGNEE       Aging List need at start
0080  128 Signed       4 DSUASA2G       copy of RSAASA2G
0084  132 Signed       4 DSUASB2G       copy of RSAASB2G
0088  136 Signed       4 DSUAGDFC       copy of RSAAGDFC (deficit)
008C  140 Signed       4 DSUIBTG        New IBR target calc'd this visit
0090  144 Signed       4 DSUSIBTG       IBR target at scan start
0094  148 Signed       4 DSUINVTG       Target number to invalidate
0098  152 Signed       4 DSUGURCT       Guest reval count
009C  156 Signed       4 DSUGURHS       Guest reval hist
00A0  160 Signed       4 DSUGUICT       Guest inval count
00A4  164 Signed       4 DSUGUIHS       Guest inval hist
00A8  168 Signed       4 DSUGLRHS       Global reval hist
00AC  172 Signed       4 DSUGLIHS       Global inval hist
00B0  176 Signed       4 DSUVISIT       Number of DS visits
00B4  180 Signed       4 DSUIBIBU       # of IBR pages in UFO IBR sect'n
          000000B4       DSUClrLn       *-DSUClr Length to clear
00B8  184 Dbl-Word     8 DSU$END (0)    End of DSINFO control block
      End of DSUBK
          000000B8       DSULEN         *-DSUBK Size of DSUBK in bytes
          00000017       DSUSIZE        (DSULEN+7)/8 Size of DSUBK in
                                        doublewords
 
 
  DSUBK Storage Layout Top of page
  
          
*** DSUBK - Demand Scan User Data Block
*
*     +---------------------------+---------------------------+
*   0 |         DSUNEXT           |         DSUVMDBK          |
*     +---------------------------+---------------------------+
*   8 |                       DSUSERID                        |
*     +-------------------------------------------------------+
*  10 |                       DSUSTART                        |
*     +---------------------------+---------------------------+
*  18 |         DSUSTACT          |         DSUSTIBR          |
*     +---------------------------+---------------------------+
*  20 |         DSUSTOLE          |         DSURQI2H          |
*     +---------------------------+---------------------------+
*  28 |         DSURQIHV          |         DSURQIHS          |
*     +---------------------------+---------------------------+
*  30 |         DSURQIHL          |         DSUINVD           |
*     +---------------------------+---------------------------+
*  38 |         DSURQH2H          |         DSURQHHS          |
*     +---------------------------+---------------------------+
*  40 |         DSURQHHL          |         DSUENACT          |
*     +---------------------------+------+------+-------------+
*  48 |         DSUENIBR          |:SKPFL|:ENDFL|  DSUSHVAL   |
*     +---------------------------+------+------+-------------+
*  50 |                       DSUENDTM                        |
*     +-------------------------------------------------------+
*  58 |                       DS1STRQH                        |
*     +-------------------------------------------------------+
*  60 |                       DS1STRQI                        |
*     +-------------------------------------------------------+
*  68 |                       DSUAGCST                        |
*     +---------------------------+---------------------------+
*  70 |         DSUAGFLI          |         DSUAGRCL          |
*     +---------------------------+---------------------------+
*  78 |                       DSUAGNEE                        |
*     +---------------------------+---------------------------+
*  80 |         DSUASA2G          |         DSUASB2G          |
*     +---------------------------+---------------------------+
*  88 |         DSUAGDFC          |         DSUIBTG           |
*     +---------------------------+---------------------------+
*  90 |         DSUSIBTG          |         DSUINVTG          |
*     +---------------------------+---------------------------+
*  98 |         DSUGURCT          |         DSUGURHS          |
*     +---------------------------+---------------------------+
*  A0 |         DSUGUICT          |         DSUGUIHS          |
*     +---------------------------+---------------------------+
*  A8 |         DSUGLRHS          |         DSUGLIHS          |
*     +---------------------------+---------------------------+
*  B0 |         DSUVISIT          |         DSUIBIBU          |
*     +---------------------------+---------------------------+
*
*** DSUBK - Demand Scan User Data Block
 
 
  DSUBK Cross Reference Top of page
  
 
Symbol         Dspl Value
-------------- ---- -----
DSU$END        00B8
DSUAGCST       0068
DSUAGDFC       0088
DSUAGFLI       0070
DSUAGNEE       0078
DSUAGRCL       0074
DSUASA2G       0080
DSUASB2G       0084
DSUClr         0000 00000004
DSUClrLn       00B4 000000B4
DSUEIBR        004D 04
DSUEIBRX       004D 10
DSUEMET        004D 08
DSUEMSFX       004D 80
DSUENACT       0044
DSUENDFL       004D
DSUENDTM       0050
DSUENIBR       0048
DSUERSRV       004D 40
DSUEWRQD       004D 20
DSUGLIHS       00AC
DSUGLRHS       00A8
DSUGUICT       00A0
DSUGUIHS       00A4
DSUGURCT       0098
DSUGURHS       009C
DSUIBIBU       00B4
DSUIBTG        008C
DSUINVD        0034
DSUINVTG       0094
DSULEN         00B8 000000B8
DSULOCKS       004C 04
DSUNEXT        0000
DSUNOPTS       004C 40
DSUNOPTX       004C 80
DSUNOSHD       004C 20
DSUNOSPC       004C 01
DSUNOUFO       004C 10
DSURQHHL       0040
DSURQHHS       003C
DSURQH2H       0038
DSURQIHL       0030
DSURQIHS       002C
DSURQIHV       0028
DSURQI2H       0024
DSUSERID       0008
DSUSHVAL       004E
DSUSIBTG       0090
DSUSIZE        00B8 00000017
DSUSKPFL       004C
DSUSTACT       0018
DSUSTART       0010
DSUSTIBR       001C
DSUSTOLE       0020
DSUSYS         004C 08
DSUVISIT       00B0
DSUVMDBK       0004
DSUVMDLO       004C 02
DS1STRQH       0058
DS1STRQI       0060
 
This information is based on z/VM 7.2.0 Last updated on 24 Jun 2020 at 09:27:54 EDT.
Copyright IBM Corporation, 1990, 2020