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 7.3.0 Last updated on 22 Jun 2022 at 15:49:54 EDT.
Copyright IBM Corporation, 1990, 2022