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Hex Dec Type/Val Lng Label (dup) Comments
---- ---- --------- ---- -------------- --------
0000 0 Structure DSCBK Demand Scan Control Block
0000 0 Signed 4 DSCWORD (0) Demand Scan Status Word
0000 0 Bitstring 1 * (3) Reserved
0003 3 Bitstring 1 DSCXSTFL XSTORE management flags
1... .... DSCXSTOR X'80' DSCXSTOR Try paging pages
out to XSTORE before sending them
to DASD.
0004 4 Signed 4 DSCINPUT (0) Demand Scan Input Word DSCINPUT
is a word of "input status" hints
for other parts of the system to
communicate information "hints"
to demand scan. NOTES : DSCINPUT
fields are NOT serialized, by the
demand scan lock or anything
else.
0004 4 Bitstring 1 * Reserved
The following bytes are used to make sure that only
one CPEBK is stacked for a deferred call to various places.
0005 5 Bitstring 1 DSCLANLK Indicate that the deferred call
to HCPLANRS has been stacked
0006 6 Bitstring 1 DSCFMVLK Indicate that the deferred call
to HCPFMVDS has been stacked
0007 7 Bitstring 1 * Reserved
0008 8 Bitstring 1 * reserved
0009 9 Bitstring 1 DSCALRDS A deferred call to HCPALRDS is
either stacked or running
000A 10 Bitstring 1 * (6) reserved
0010 16 Signed 4 DSCCYCL Count the number of scan cycles
0014 20 Signed 4 * Reserved
These fields apply to the current Demand Scan.
0018 24 Signed 4 * (2) Reserved Output from subroutine
CALCMORE in HCPALU. Updated by
CALCMORE. Not changed until the
next call to CALCMORE. These are
"type-any" needs and represent a
current need. (I.E. Deficit
numbers are not factored in.)
0020 32 Dbl-Word 8 DSCREQSingles Singles Frames needed.
0028 40 Dbl-Word 8 DSCREQContigs Contigs Frames needed.
0030 48 Dbl-Word 8 DSCSTLW (0) Steal Write counters (Low/High)
0030 48 Signed 4 DSCSTLW0 Steal Write frames BELOW 2Gb
0034 52 Signed 4 DSCSTLWG Steal Write frames 2Gb and ABOVE
0038 56 Signed 4 DSCSTLP0 Steal Write PGMBKs BELOW 2Gb
003C 60 Signed 4 DSCSTLPG Steal Write PGMBKs 2Gb and ABOVE
00000010 DSCSTLWL *-DSCSTLW Length of all STL
fields
0040 64 Dbl-Word 8 * Reserved
0048 72 Dbl-Word 8 * Reserved
0050 80 Dbl-Word 8 * Reserved
0058 88 Dbl-Word 8 * Reserved
0060 96 Signed 4 * Reserved
0064 100 Signed 4 DSCRLRDV Stack of CPEBKs to be redriven by
Demand Scan after DPPL
processing. Serialized by CS.
Relocations push a CPEBK onto
this stack; Demand Scan harvests
entire stack at once. Init'd and
reset to 0; Demand Scan sets to
-1 to tell relos to open a PTIL
window; contains CPEBK addr when
at least one relo is waiting to
be redriven by Demand Scan.
CPEBKs chained by CPEXFPNT and
terminated by -1.
DSCPGMC0/CG account for the PGMBK frames put on the DPPL by
PGMBK Steal. They do not include any frames put on the
DPPL by other tasks, nor is there a guarantee the frames
will be reclaimable when the DPPL is processed. These counts
are purely an estimate of reclaimable frames that are used
in the need calculation in an effort to avoid over stealing.
Given their "fuzzy" nature, the counts are cleared each time
PGMBK Steal processes the DPPL because either the frames
were successfully reclaimed (and will therefore be included
in the available frame counts) or they could not be
reclaimed and may not even reside on the DPPL any longer
(in which case we would not want to count them in the need
calculation).
0068 104 Signed 4 DSCPGMC0 PGMBKs <2G put on the DPPL by
PGMBK steal since the last time
the DPPL was processed by PGMBK
steal. This count is in frames,
so it is 2x the count of PGMBKs.
006C 108 Signed 4 DSCPGMCG PGMBKs >=2G put on the DPPL by
PGMBK steal since the last time
the DPPL was processed by PGMBK
steal. This count is in frames,
so it is 2x the count of PGMBKs.
0070 112 Signed 4 * Reserved
These fields are primarily for diagnostic purposes.
They should not affect the operation of Demand Scan.
0074 116 Bitstring 1 DSCDEBUG Debug Flags
1... .... DSCACTIV X'80' DSCACTIV Demand Scan is
ACTIVE
0075 117 Bitstring 3 * reserved
0078 120 Signed 4 DSCCOUNT Count the number of times we
entered Demand Scan (HCPALDSC)
007C 124 Signed 4 * Reserved
0080 128 Address 4 DSCWHOCM Last caller of CALCMORE routine
0084 132 Address 4 DSCWHOEX Previous HCPCALL before CALCMORE
0088 136 Signed 4 DSCANYDB <>2G frames (frames that
can be anywhere) that were
allocated to the <2G need.
(Demand Below)
008C 140 Signed 4 DSCANYDA <>2G frames that were
allocated to the >2G need.
(Demand Above)
0090 144 Signed 8 DSCRLOWS Time stamp of the last time
DSCRLRDV was set to -1.
0098 152 Signed 8 DSCRLOWR Time stamp of the last time
DSCRLRDV was reset to 0.
00A0 160 Dbl-Word 8 * Reserved
00A8 168 Dbl-Word 8 * Reserved
00B0 176 Signed 4 * Reserved
00B4 180 Signed 4 DSCALSKF Times an Aging List page was not
taken (i.e. was skipped) because
we couldn't get frame ser.
00B8 184 Signed 4 DSCALSKP Times an Aging List page was not
taken (i.e. was skipped) because
we couldn't get PTE serializ.
00BC 188 Signed 4 * Reserved
00C0 192 Signed 4 * Reserved
00C4 196 Signed 4 * Reserved
Communication from the frame manager to subroutine CALCMORE.
00C8 200 Dbl-Word 8 DSCRSingles (Rate) Need for type any singles.
00D0 208 Dbl-Word 8 DSCRContigs (Rate) Need for type any contigs.
CALCMORE data area.
These values represent harvested rate based information.
00D8 216 Dbl-Word 8 DSCHSingles (Rate) Harvested need for
singles.
00E0 224 Dbl-Word 8 DSCHContigs (Rate) Harvested need for
contigs.
These values are the rate based need to use for the current
call to CALCMORE. (Either DSCHSingles at the beginning of
a new Demand scan. Or a Delta at the end of a Demand scan.)
00E8 232 Dbl-Word 8 DSCNSingles Rate based need for singles.
00F0 240 Dbl-Word 8 DSCNContigs Rate based need for contigs.
"Who invoked demand scan" data:
00F8 248 Signed 4 DSCwhoFg (0)
00F8 248 Bitstring 1 DSCwhoRq Who invoked demand scan debug -
all requestors
00F9 249 Bitstring 1 DSCwhoFl Who invoked demand scan debug -
who actually flagpoled
Equates for DSCwhoRq and DSCwhoFl
1... .... DSCwhoDSEW X'80' ALD/G DSEarlyWrite
.1.. .... DSCwhoDSRS X'40' ALDSC DSRestart
..1. .... DSCwhoTHRS X'20' ALUDS Threshold
...1 .... DSCwhoAGRV X'10' PFR AgingRevals
.... 1... DSCwhoFRDF X'08' PTF FrameReqDefer
.... .1.. DSCwhoLGR X'04' RLT LGR *cmnt** EQU X'02'
reserved *cmnt** EQU X'01'
reserved
00FA 250 Bitstring 1 * (2) Reserved for DSCwhoFg expansion,
must remain 0s
Array of counts of times each task attempted to flag Demand
scan to start:
00FC 252 Signed 4 DSCwhoCtArray (8)
00FC 252 Signed 4 DSCwhoCtDSEW ALD/G DSEarlyWrite
0100 256 Signed 4 DSCwhoCtDSRS ALDSC DSRestart
0104 260 Signed 4 DSCwhoCtTHRS ALUDS DSThreshold
0108 264 Signed 4 DSCwhoCtAGRV PFR AgingRevals
010C 268 Signed 4 DSCwhoCtFRDF PTF FrameReqDefer
0110 272 Signed 4 DSCwhoCtLGR RLT LGR
0114 276 Signed 4 * reserved
0118 280 Signed 4 * reserved
011C 284 Bitstring 1 DSC$END (0) End of DSCBK
0000011C DSCBKLN *-DSCBK DSCBK length (in bytes)
00000024 DSCBKSZ (*-DSCBK+7)/8 DSCBK size (in
doublewords)
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