starkernel: item 3.4 -- density ranking
Punch list §25 item 3.4 complete. stadium_density(cell_index) reads a header's heat and mass and returns heat / mass -- a division on demand from fields already stored in the cell, matching §19.3's "read, not computed by a scheduler" literally. Stays valid Q48.16 without a special fixed-point routine, since heat is already Q48.16 and mass is a plain integer divisor. mass == 0 and an out-of-range cell_index both return 0 rather than dividing by zero -- an empty or never-admitted slot has no footprint to be dense within. Deliberately not built here, per the item's own wording: finding the densest or least-dense resident (§19.3's admission/eviction comparison) is item 3.5's scope, not this one's. Nothing calls stadium_density() yet either. Verified: three-architecture boot (amd64, aarch64, riscv64), all reaching ok> with identical dict_hash=0x3d4e1daf289da94f matching the item-3.3 baseline. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Robert Allan James
co-authored by
Claude Sonnet 5
Claude Sonnet 5
parent
378d688898
commit
0b47c256fc
@@ -2773,7 +2773,29 @@ document and committing that amendment as its own item.*
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> `dict_hash=0x3d4e1daf289da94f`, matching the item-3.2 baseline — amd64
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> (`logs/20260804-170226`), aarch64 (`logs/20260804-170309`), riscv64
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> (`logs/20260804-170407`).
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- [ ] **3.4 — Density ranking.** Heat ÷ mass, read not computed. *Refs:* §19.2, §19.3.
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- [x] **3.4 — Density ranking.** Heat ÷ mass, read not computed. *Refs:* §19.2, §19.3.
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> **DONE 2026-08-04.** `stadium_density(cell_index)` (`stadium.c`) reads a header's `heat`
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> and `mass` and returns `heat / mass` — a division on demand from fields already stored
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> in the cell, matching §19.3's "read, not computed by a scheduler" literally: no
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> background process maintains this value. Stays valid Q48.16 without any special
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> fixed-point routine, since `heat` is already Q48.16 and `mass` is a plain integer
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> divisor.
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>
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> `mass == 0` and an out-of-range `cell_index` both return 0 rather than dividing by zero
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> — an empty or never-admitted slot (everything is zero-initialized by item 3.2's
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> `stadium_boot_init()`, and nothing yet births a patron into the Stadium) has no
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> footprint to be dense within.
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>
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> **Deliberately not built here, per the item's own wording:** finding the densest or
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> least-dense resident (§19.3's admission/eviction comparison) is item 3.5's scope — this
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> function supplies the per-cell value that comparison will read, not the ranking/min-max
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> machinery itself. Nothing calls `stadium_density()` yet either.
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>
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> **Regression: clean.** All three architectures boot to `ok>` with identical
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> `dict_hash=0x3d4e1daf289da94f`, matching the item-3.3 baseline — amd64
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> (`logs/20260804-171332`), aarch64 (`logs/20260804-171414`), riscv64
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> (`logs/20260804-171513`).
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- [ ] **3.5 — Admission and eviction.** Admit if denser than the least dense resident.
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*Refs:* §19.3.
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- [ ] **3.6 — Hera as patron zero, pinned.** Assert at the eviction site; selecting Hera is
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@@ -1,5 +1,5 @@
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# Capsule Block Manifest — Auto-generated
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<!-- Generated by mkcapsule --manifest 2026-08-04T21:03:52Z -->
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<!-- Generated by mkcapsule --manifest 2026-08-04T21:14:57Z -->
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<!-- DO NOT EDIT — re-run mkcapsule --manifest to refresh. -->
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<!-- Hand-written justifications and immutability notes live -->
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<!-- in MANIFEST.md alongside this auto-generated index. -->
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@@ -0,0 +1,59 @@
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@@ -0,0 +1,59 @@
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|
||||
11,110000,10000,0,0,207,23,86,731,731,0,0,0,65536,0,0,65536,0,0
|
||||
12,120000,10000,0,0,189,26,83,4096,0,0,0,0,65536,0,0,65536,0,0
|
||||
13,130000,10000,0,0,221,28,80,731,731,0,0,0,65536,0,0,65536,0,0
|
||||
14,140000,10000,0,0,204,29,83,685,685,0,0,0,65536,0,0,65536,0,0
|
||||
15,150000,10000,0,0,203,30,82,731,731,0,0,0,65536,0,0,65536,0,0
|
||||
16,160000,10000,0,0,201,32,83,567,567,0,0,0,65536,0,0,65536,0,0
|
||||
17,170000,10000,0,0,190,34,86,731,731,0,0,0,65536,0,0,65536,0,0
|
||||
18,180000,10000,0,0,170,35,73,582,582,0,0,0,65536,0,0,65536,0,0
|
||||
19,190000,10000,0,0,154,28,44,731,731,0,0,0,65536,0,0,65536,0,0
|
||||
20,200000,10000,0,0,154,28,41,567,567,0,0,0,65536,0,0,65536,0,0
|
||||
21,210000,10000,0,0,153,32,39,4096,0,0,0,0,65536,0,0,65536,0,0
|
||||
22,220000,10000,0,0,167,35,42,582,582,0,0,0,65536,0,0,65536,0,0
|
||||
23,230000,10000,0,0,176,37,41,685,685,0,0,0,65536,0,0,65536,0,0
|
||||
24,240000,10000,0,0,175,37,39,731,731,0,0,0,65536,0,0,65536,0,0
|
||||
25,250000,10000,0,0,196,38,37,731,731,0,0,0,65536,0,0,65536,0,0
|
||||
26,260000,10000,0,0,192,41,37,4096,0,0,0,0,65536,0,0,65536,0,0
|
||||
27,270000,10000,0,0,158,40,38,685,685,0,0,0,65536,0,0,65536,0,0
|
||||
28,280000,10000,0,0,158,40,35,4096,0,0,0,0,65536,0,0,65536,0,0
|
||||
29,290000,10000,0,0,164,41,37,4096,0,0,0,0,65536,0,0,65536,0,0
|
||||
30,300000,10000,0,0,154,43,39,685,685,0,0,0,65536,0,0,65536,0,0
|
||||
31,310000,10000,0,0,172,46,35,582,582,0,0,0,65536,0,0,65536,0,0
|
||||
32,320000,10000,0,0,180,49,34,567,567,0,0,0,65536,0,0,65536,0,0
|
||||
33,330000,10000,0,0,145,51,35,567,567,0,0,0,65536,0,0,65536,0,0
|
||||
34,340000,10000,0,0,203,53,37,582,582,0,0,0,65536,0,0,65536,0,0
|
||||
35,350000,10000,0,0,154,55,39,731,731,0,0,0,65536,0,0,65536,0,0
|
||||
36,360000,10000,0,0,144,57,37,4096,0,0,0,0,65536,0,0,65536,0,0
|
||||
37,370000,10000,0,0,144,57,35,4096,0,0,0,0,65536,0,0,65536,0,0
|
||||
38,380000,10000,0,0,132,57,34,4096,0,0,0,0,65536,0,0,65536,0,0
|
||||
39,390000,10000,0,0,180,57,32,4096,0,0,0,0,65536,0,0,65536,0,0
|
||||
40,400000,10000,0,0,220,63,29,4096,0,0,0,0,65536,0,0,65536,0,0
|
||||
41,410000,10000,0,0,215,64,28,4096,24,0,0,0,65536,0,0,65536,0,0
|
||||
42,420000,10000,0,0,208,68,29,4096,24,0,0,0,65536,0,0,65536,0,0
|
||||
43,430000,10000,0,0,177,72,27,4096,24,0,0,0,65536,0,0,65536,0,0
|
||||
44,440000,10000,0,0,199,77,28,4096,24,0,0,0,65536,0,0,65536,0,0
|
||||
45,450000,10000,0,0,223,82,26,4096,30,0,0,0,65536,0,0,65536,0,0
|
||||
46,460000,10000,0,0,202,85,24,4096,67,0,0,0,65536,0,0,65536,0,0
|
||||
47,470000,10000,0,0,218,91,25,4096,198,0,0,0,65536,0,0,65536,0,0
|
||||
48,480000,10000,0,0,221,92,26,4096,350,0,0,0,65536,0,0,65536,0,0
|
||||
49,490000,10000,0,0,225,97,26,4096,528,0,0,0,65536,0,0,65536,0,0
|
||||
50,500000,10000,0,0,214,100,27,4096,694,0,0,0,65536,0,0,65536,0,0
|
||||
51,510000,10000,0,0,227,102,28,4096,883,0,0,0,65536,0,0,65536,0,0
|
||||
52,520000,10000,0,0,208,102,29,4096,1043,0,0,0,65536,0,0,65536,0,0
|
||||
53,530000,10000,0,0,207,102,30,4096,1202,0,0,0,65536,0,0,65536,0,0
|
||||
54,540000,10000,0,0,200,102,31,4096,1319,0,0,0,65536,0,0,65536,0,0
|
||||
55,550000,10000,0,0,205,103,32,4096,1464,0,0,0,65536,0,0,65536,0,0
|
||||
56,560000,10000,0,0,211,103,32,4096,1620,0,0,0,65536,0,0,65536,0,0
|
||||
57,570000,10000,0,0,193,110,33,4096,1712,0,0,0,65536,0,0,65536,0,0
|
||||
58,580000,10000,0,0,190,5,67,4096,1775,0,0,0,65536,0,0,65536,0,0
|
||||
|
@@ -178,6 +178,29 @@ typedef enum {
|
||||
*/
|
||||
void stadium_dispatch(size_t cell_index, StadiumBehaviour behaviour);
|
||||
|
||||
/*
|
||||
* stadium_density - Heat / mass for the patron header at cell_index (FABRIC.md
|
||||
* §19.2, §19.3). Read, not computed by a scheduler: both operands already
|
||||
* live in the header, so this is a division on demand, not maintained
|
||||
* bookkeeping. Result stays valid Q48.16, since heat is already Q48.16 and
|
||||
* mass is a plain integer divisor.
|
||||
*
|
||||
* Returns 0 if mass is 0 -- an empty or never-admitted slot (everything is
|
||||
* zero-initialized by stadium_boot_init() until something is actually born
|
||||
* into the Stadium, which nothing yet does) has no footprint to be dense
|
||||
* within, rather than a division by zero.
|
||||
*
|
||||
* Does not validate that cell_index actually holds a header rather than a
|
||||
* continuation cell or an out-of-range index -- callers are expected to
|
||||
* consult the item-3.1 discriminator bitmap first. Ranking (finding the
|
||||
* densest or least-dense resident) is item 3.5's scope, not this one's;
|
||||
* this function only supplies the per-cell value that comparison reads.
|
||||
*
|
||||
* @param cell_index Index into the Stadium of the patron header to measure.
|
||||
* @return Density in Q48.16, or 0 if the header's mass is 0.
|
||||
*/
|
||||
uint64_t stadium_density(size_t cell_index);
|
||||
|
||||
#endif /* __STARKERNEL__ */
|
||||
|
||||
#endif /* STARKERNEL_VM_STADIUM_H */
|
||||
File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
File diff suppressed because it is too large
Load Diff
@@ -150,4 +150,23 @@ void stadium_dispatch(size_t cell_index, StadiumBehaviour behaviour) {
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* FABRIC.md §19.2/§19.3: density is heat / mass, read on demand from fields
|
||||
* already in the header -- not a value a scheduler maintains. mass == 0
|
||||
* (an empty or never-admitted slot; everything is zero-initialized until
|
||||
* something is actually born into the Stadium, which nothing yet does)
|
||||
* returns 0 rather than dividing by zero. An out-of-range cell_index also
|
||||
* returns 0 -- there is no patron there to be dense.
|
||||
*/
|
||||
uint64_t stadium_density(size_t cell_index) {
|
||||
StadiumPatronHeader *header;
|
||||
|
||||
if (cell_index >= stadium_ncells) return 0;
|
||||
|
||||
header = &stadium_cell_array[cell_index].header;
|
||||
if (header->mass == 0) return 0;
|
||||
|
||||
return header->heat / (uint64_t)header->mass;
|
||||
}
|
||||
|
||||
#endif /* __STARKERNEL__ */
|
||||
Reference in New Issue
Block a user