SSDBK Back to Index page
 
Prolog 
Control Block Contents 
   SSDBK 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.


  SSDBK Prolog Top of page
 
 NAME       : HCPSSDBK
 DESCRIPTION: SYSTEM SMOOTHED DATA BLOCK
 DSECT      : SSDBK
 FUNCTION   : MAPS PERMANENT FREE STORAGE WHICH CONTAINS
              THE DATA HISTORY NEEDED FOR SMOOTHING OVER
              TIME.
 LOCATED BY : SRMSTPTB FIELD IN THE SRMBK
 CREATED BY : HCPISR AT SYSTEM INITIALIZATION.
 DELETED BY : NOT DELETED.  PERMANENT FREE STORAGE.
 RELOCATION CONSIDERATIONS : None
 COMMENTS   : - This control block is acquired by HCPISR at
              system initialization for the exclusive use
              of HCPSTP.  Since HCPSTP is a single-threaded
              system task, there are no serialization
              requirements for the data.
              - There are 6 areas of the SSDBK.  The last is defined
              by the ORG on SSDREST.  The first 5 are all the same
              size and are 1st defined by the ORG on SSDTABLE.
              The corresponding areas are defined as follows.  If
              R1 points to an entry in the first area then:
              0*SSDTBL(,R1) - Value from CP data accumulator
              1*SSDTBL(,R1) - Contains new sample average
              smoothed over DRATE.
              2*SSDTBL(,R1) - Current delta value (observed) in
              the CP data accumulator this time.
              3*SSDTBL(,R1) - Previous delta value (observed)
              in the CP data accumulator last
              time.  (ONLY CALCULATED FOR
              SUBROUTINE SDATF.  THIS VALUE IS
              CALCULATED FOR DEBUGGING ONLY)
              4*SSDTBL(,R1) - Contains new sample average
              smoothed over HRATE.
              - The following equats may be used to address the data.
              -  No offset is needed to access the
              value from the CP accumulator.
              - DRATEAVE = 1*SSDTBL
              - CDELTA   = 2*SSDTBL
              - PDELTA   = 3*SSDTBL
              - HRATEAVE = 4*SSDTBL
 
 
  SSDBK Control Block Content Top of page
 

 SSDBK DSECT Top of page
Hex Dec Type/Val Lng Label (dup) Comments ---- ---- --------- ---- -------------- -------- 0000 0 Structure SSDBK SYSTEM SMOOTHED DATA BLOCK 0000 0 Bitstring 1000 SSDTABLE Total size of 5 copies of SSDTB 03E8 1000 Bitstring 40 SSDREST SIZE OF DATA AREA AFTER TABLES 00000082 SSDSIZE (*-SSDBK+7)/8 DOUBLEWORD SIZE OF SSDBK 0000 0 Dbl-Word 8 SSDTB TABLE START; X'FF'S EYECATCHER 0008 8 Dbl-Word 8 SSDELP ELAPSED TIME 0010 16 Signed 4 SSDSTL STEAL PAGES INCREMENT 0014 20 Signed 4 SSDTRM DENOMINATOR TERM FOR STEAL CALC. 0018 24 Dbl-Word 8 SSDTRD TIME A USER TAKES TO READ A PAGE 0020 32 Signed 4 SSDWSS PROJECTED WSS 0024 36 Signed 4 SSDPGIO DASD PAGE I/O OPERATIONS 0028 40 Signed 4 SSDC1CUM ACCUMULATED CLASS 1 USERS 002C 44 Signed 4 SSDC1WSS ACCUMULATED CLASS 1 WSS 0030 48 Signed 4 SSDC1PGR ACCUMULATED CLASS 1 PAGING RATE 0034 52 Signed 4 SSDXSTUF XSTORE info for average age 0038 56 Signed 4 SSDAUWSS AVERAGE USER'S WSS 003C 60 Signed 4 SSDAUPGR AVERAGE USER'S PAGING RATE 0040 64 Signed 4 SSDSRWP SYSTEM RESOURCE WEIGHT FOR PAGING 0044 68 Signed 4 SSDSRWS SYSTEM RESOURCE WEIGHT " STORAGE 0048 72 Signed 4 SSDSTEAL SYSTEM WIDE STEAL VALUE 004C 76 Signed 4 SSDEXPF1 CLASS 1 EXPANSION FACTOR ACCUM 0050 80 Signed 4 SSDEXPF2 CLASS 2 EXPANSION FACTOR ACCUM 0054 84 Signed 4 SSDEXPF3 CLASS 3 EXPANSION FACTOR ACCUM 0058 88 Signed 4 SSDXSTR XSTORE PAGE RATE (PGIN + PGOUT) 005C 92 Signed 4 SSDXMIG XSTORE MIGRATE RATE 0060 96 Signed 4 SSDMDCPR MiniDisk Cache: XSTORE Reads 0064 100 Signed 4 SSDMDCPW MiniDisk Cache: XSTORE Writes 0068 104 Signed 4 SSDXMI2 XSTORE migrates for MDC adjusted every other STP intervl 006C 108 Signed 4 SSDMDCIA MiniDisk Cache: I/Os avoided 0070 112 Signed 4 SSDMDCNA MiniDisk Cache: I/Os not avoided 0074 116 Signed 4 SSDSTL2 Paging steal rates for MDC adjusted every other STP intervl 0078 120 Signed 4 SSDDORM COUNT OF DORMANT LIST USERS. 007C 124 Signed 4 SSDTCDEL Count of pages stolen from full track cache 0080 128 Signed 4 SSDTCXDL Count of XSTORE blocks deleted from full track cache THE FOLLOWING TABLE HOLDS SMOOTHED LIST ACCUMULATORS FOR THE NUMBER OF USERS AND LOADING USERS IN THE DISPATCH AND ELIGIBLE LISTS. THE ORDER HERE IS CRITICAL AND SHOULD NOT BE CHANGED WITHOUT THOROUGH EXAMINATION OF HOW THEY ARE USED IN HCPSTPGS'S CODE (ORDER MATCHES WITH SRMUSERC IN SRMBK). 00000084 SSDUSERC * START OF THE USER COUNTERS 0084 132 Signed 4 SSDDL TOTAL DLIST USER COUNT 0088 136 Signed 4 SSDD0 CLASS 0 DLIST USER COUNT 008C 140 Signed 4 SSDD1 CLASS 1 DLIST USER COUNT 0090 144 Signed 4 SSDD2 CLASS 2 DLIST USER COUNT 0094 148 Signed 4 SSDD3 CLASS 3 DLIST USER COUNT 0098 152 Signed 4 SSDLD0 CLASS 0 LOADING DLIST USER COUNT 009C 156 Signed 4 SSDLD1 CLASS 1 LOADING DLIST USER COUNT 00A0 160 Signed 4 SSDLD2 CLASS 2 LOADING DLIST USER COUNT 00A4 164 Signed 4 SSDLD3 CLASS 3 LOADING DLIST USER COUNT 00A8 168 Signed 4 SSDE0 CLASS 0 ELIST USER COUNT 00AC 172 Signed 4 SSDE1 CLASS 1 ELIST USER COUNT 00B0 176 Signed 4 SSDE2 CLASS 2 ELIST USER COUNT 00B4 180 Signed 4 SSDE3 CLASS 3 ELIST USER COUNT 00B8 184 Signed 4 SSDLE0 CLASS 0 LOADING ELIST USER COUNT 00BC 188 Signed 4 SSDLE1 CLASS 1 LOADING ELIST USER COUNT 00C0 192 Signed 4 SSDLE2 CLASS 2 LOADING ELIST USER COUNT 00C4 196 Signed 4 SSDLE3 CLASS 3 LOADING ELIST USER COUNT 00000044 SSDUSERL *-SSDUSERC LENGTH OF THE USER TABLE 000000C8 SSDTBL *-SSDTB TABLE LENGTH IN BYTES NOTES : The following macro invocation causes an assemble NOTES : error (ARITHMETIC OVERFLOW) if the coded table size is NOTES : insufficient. 03E8 1000 Bitstring 34 SSDUSERB STARTING ADDRESS OF A BUFFER CONTAINING CORRESPONDING HALFWORD FIELDS TO SSDUSERC'S FULLWORD FIELDS. IT IS USED TO HOLD THE DISPATCH AND ELIGIBLE LIST COUNTS TO BE SMOOTHED. 0000040A SSDUSRBE * ENDING ADDRESS OF SSDUSERB 000000C8 DRATEAVG 1*SSDTBL 00000190 CDELTA 2*SSDTBL 00000258 PDELTA 3*SSDTBL 00000320 HRATEAVG 4*SSDTBL
 
 
  SSDBK Storage Layout Top of page
 
          
*** SSDBK - SYSTEM SMOOTHED DATA BLOCK
*
*     +-------------------------------------------------------+
*   0 |                                                       |
*     =                       SSDTABLE                        =
*     |                                                       |
*     +-------------------------------------------------------+
* 3E8 |                                                       |
*     =                       SSDREST                         =
*     |                                                       |
*     +-------------------------------------------------------+
* 410
*
*** SSDBK - SYSTEM SMOOTHED DATA BLOCK
          
*** Overlay for SSDTABLE in SSDBK
*
*     +-------------------------------------------------------+
*   0 |                        SSDTB                          |
*     +-------------------------------------------------------+
*   8 |                        SSDELP                         |
*     +---------------------------+---------------------------+
*  10 |          SSDSTL           |          SSDTRM           |
*     +---------------------------+---------------------------+
*  18 |                        SSDTRD                         |
*     +---------------------------+---------------------------+
*  20 |          SSDWSS           |         SSDPGIO           |
*     +---------------------------+---------------------------+
*  28 |         SSDC1CUM          |         SSDC1WSS          |
*     +---------------------------+---------------------------+
*  30 |         SSDC1PGR          |         SSDXSTUF          |
*     +---------------------------+---------------------------+
*  38 |         SSDAUWSS          |         SSDAUPGR          |
*     +---------------------------+---------------------------+
*  40 |         SSDSRWP           |         SSDSRWS           |
*     +---------------------------+---------------------------+
*  48 |         SSDSTEAL          |         SSDEXPF1          |
*     +---------------------------+---------------------------+
*  50 |         SSDEXPF2          |         SSDEXPF3          |
*     +---------------------------+---------------------------+
*  58 |         SSDXSTR           |         SSDXMIG           |
*     +---------------------------+---------------------------+
*  60 |         SSDMDCPR          |         SSDMDCPW          |
*     +---------------------------+---------------------------+
*  68 |         SSDXMI2           |         SSDMDCIA          |
*     +---------------------------+---------------------------+
*  70 |         SSDMDCNA          |         SSDSTL2           |
*     +---------------------------+---------------------------+
*  78 |         SSDDORM           |         SSDTCDEL          |
*     +---------------------------+---------------------------+
*  80 |         SSDTCXDL          |          SSDDL            |
*     +---------------------------+---------------------------+
*  88 |          SSDD0            |          SSDD1            |
*     +---------------------------+---------------------------+
*  90 |          SSDD2            |          SSDD3            |
*     +---------------------------+---------------------------+
*  98 |          SSDLD0           |          SSDLD1           |
*     +---------------------------+---------------------------+
*  A0 |          SSDLD2           |          SSDLD3           |
*     +---------------------------+---------------------------+
*  A8 |          SSDE0            |          SSDE1            |
*     +---------------------------+---------------------------+
*  B0 |          SSDE2            |          SSDE3            |
*     +---------------------------+---------------------------+
*  B8 |          SSDLE0           |          SSDLE1           |
*     +---------------------------+---------------------------+
*  C0 |          SSDLE2           |          SSDLE3           |
*     +---------------------------+---------------------------+
*  C8
*
*** Overlay for SSDTABLE in SSDBK
          
*** Overlay for SSDREST in SSDBK
*
*     +-------------------------------------------------------+
* 3E8 |                                                       |
*     =                       SSDUSERB                        =
*     |             +-----------------------------------------+
*     |             | 40A
*     +-------------+
*
*** Overlay for SSDREST in SSDBK
 
 
  SSDBK Cross Reference Top of page
 
 
Symbol         Dspl Value
-------------- ---- -----
CDELTA         03E8 00000190
DRATEAVG       03E8 000000C8
HRATEAVG       03E8 00000320
PDELTA         03E8 00000258
SSDAUPGR       003C
SSDAUWSS       0038
SSDC1CUM       0028
SSDC1PGR       0030
SSDC1WSS       002C
SSDDL          0084
SSDDORM        0078
SSDD0          0088
SSDD1          008C
SSDD2          0090
SSDD3          0094
SSDELP         0008
SSDEXPF1       004C
SSDEXPF2       0050
SSDEXPF3       0054
SSDE0          00A8
SSDE1          00AC
SSDE2          00B0
SSDE3          00B4
SSDLD0         0098
SSDLD1         009C
SSDLD2         00A0
SSDLD3         00A4
SSDLE0         00B8
SSDLE1         00BC
SSDLE2         00C0
SSDLE3         00C4
SSDMDCIA       006C
SSDMDCNA       0070
SSDMDCPR       0060
SSDMDCPW       0064
SSDPGIO        0024
SSDREST        03E8
SSDSIZE        03E8 00000082
SSDSRWP        0040
SSDSRWS        0044
SSDSTEAL       0048
SSDSTL         0010
SSDSTL2        0074
SSDTABLE       0000
SSDTB          0000
SSDTBL         00C4 000000C8
SSDTCDEL       007C
SSDTCXDL       0080
SSDTRD         0018
SSDTRM         0014
SSDUSERB       03E8
SSDUSERC       0080 00000084
SSDUSERL       00C4 00000044
SSDUSRBE       03E8 0000040A
SSDWSS         0020
SSDXMIG        005C
SSDXMI2        0068
SSDXSTR        0058
SSDXSTUF       0034
 
This information is based on z/VM 7.3.0 Last updated on 22 Jun 2022 at 15:56:24 EDT.
Copyright IBM Corporation, 1990, 2022