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stadium: make VM population bound RAM-derived, not a static array of 4

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Replaces STADIUM_MAX_VM_COUNT (Kconfig, hardcoded default 4) with a
boot-time computation, mirroring the pattern stadium_boot_init() already
used for the cell pool. New Kconfig STADIUM_VM_MEMORY_PERCENT (default
50): max_vm_count = (kmalloc_get_stats().free_bytes after the cell array
* STADIUM_VM_MEMORY_PERCENT / 100) / VM_MEMORY_SIZE, floored to 1, no
ceiling (population is not knowable in advance - could be 4, could be
4000). stadium_quotas and word_slots (plus stat_promotions/stat_evictions)
are now kmalloc'd to the computed count instead of declared with a macro.
New accessor stadium_max_vm_count() replaces every STADIUM_MAX_VM_COUNT
reference, including capsule_birth.c's birth-refusal gate.

Two things found and fixed along the way:

- The existing cell-pool budget was sourced from pmm_get_stats(), which
  reflects physical pages PMM hasn't handed to any subsystem yet - but
  the actual allocation is kmalloc(), which draws from the separate,
  fixed-size heap kmalloc_init() (M6) already carved out of PMM before
  stadium_boot_init() ever runs. Budgeting against PMM's leftover and
  allocating from the kmalloc heap are two different pools. Both the
  cell budget and the new VM-count budget now source from
  kmalloc_get_stats() instead.

- stadium_owner[] (which VM's quota owns each cell) was uint8_t, capped
  at 255 slots by a compile-time assert tied to the old macro. Widened
  to uint16_t (65535 slots of headroom) with a runtime clamp + log if
  the computed count ever exceeds that, since there's no ceiling anymore.

Three-arch QEMU acceptance: all clean to ok>, computed VM count genuinely
differs by actual available RAM (amd64/riscv64: 50 slots at -m 1024,
aarch64: 101 slots), Stadium conservation invariant identical across all
three (resident_sum=43691 reservoir=21845 sum=65536).
logs/20260815-080526/amd64, logs/20260815-080826/aarch64,
logs/20260815-080952/riscv64.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Robert Allan James
2026-08-15 08:11:21 -04:00
co-authored by Claude Sonnet 5
parent 154eddeab0
commit 00e657019e
16 changed files with 26118 additions and 127 deletions
Download Patch File Download Diff File Expand all files Collapse all files
experiments/bare_metal/latest/amd64.csv
+38 -38
View File
@@ -20,8 +20,8 @@ tick_number,elapsed_ns,tick_interval_ns,cache_hits_delta,bucket_hits_delta,word_
19,190000,10000,0,0,154,35,40,731,731,0,0,0,65536,0,0,65536,0,0
20,200000,10000,0,0,154,35,38,567,567,0,0,0,65536,0,0,65536,0,0
21,210000,10000,0,0,153,38,37,4096,0,0,0,0,65536,0,0,65536,0,0
22,220000,10000,0,0,167,40,38,582,582,0,0,0,65536,0,0,65536,0,0
23,230000,10000,0,0,176,17,38,685,685,0,0,0,65536,0,0,65536,0,0
22,220000,10000,0,0,167,38,38,582,582,0,0,0,65536,0,0,65536,0,0
23,230000,10000,0,0,176,11,37,685,685,0,0,0,65536,0,0,65536,0,0
24,240000,10000,0,0,175,10,25,731,731,0,0,0,65536,0,0,65536,0,0
25,250000,10000,0,0,196,11,23,731,731,0,0,0,65536,0,0,65536,0,0
26,260000,10000,0,0,192,14,24,4096,0,0,0,0,65536,0,0,65536,0,0
@@ -48,14 +48,14 @@ tick_number,elapsed_ns,tick_interval_ns,cache_hits_delta,bucket_hits_delta,word_
47,470000,10000,0,0,218,57,18,4096,198,0,0,0,65536,0,0,65536,0,0
48,480000,10000,0,0,221,60,20,4096,350,0,0,0,65536,0,0,65536,0,0
49,490000,10000,0,0,225,66,20,4096,528,0,0,0,65536,0,0,65536,0,0
50,500000,10000,0,0,214,69,21,4096,694,0,0,0,65536,0,0,65536,0,0
50,500000,10000,0,0,214,69,22,4096,694,0,0,0,65536,0,0,65536,0,0
51,510000,10000,0,0,227,71,23,4096,883,0,0,0,65536,0,0,65536,0,0
52,520000,10000,0,0,208,71,23,4096,1043,0,0,0,65536,0,0,65536,0,0
52,520000,10000,0,0,208,71,24,4096,1043,0,0,0,65536,0,0,65536,0,0
53,530000,10000,0,0,207,71,25,4096,1202,0,0,0,65536,0,0,65536,0,0
54,540000,10000,0,0,200,71,26,4096,1319,0,0,0,65536,0,0,65536,0,0
55,550000,10000,0,0,205,72,27,4096,1464,0,0,0,65536,0,0,65536,0,0
56,560000,10000,0,0,211,73,27,4096,1620,0,0,0,65536,0,0,65536,0,0
57,570000,10000,0,0,193,80,28,4096,1712,0,0,0,65536,0,0,65536,0,0
57,570000,10000,0,0,193,80,29,4096,1712,0,0,0,65536,0,0,65536,0,0
58,580000,10000,0,0,185,4,61,4096,1757,0,0,0,65536,0,0,65536,0,0
59,590000,10000,0,0,81,7,32,4096,1757,0,0,0,65536,0,0,65536,0,0
60,600000,10000,0,0,52,10,28,4096,1757,0,0,0,65536,0,0,65536,0,0
@@ -72,39 +72,39 @@ tick_number,elapsed_ns,tick_interval_ns,cache_hits_delta,bucket_hits_delta,word_
71,710000,10000,0,0,44,22,39,4096,1757,0,0,0,65536,0,0,65536,0,0
72,720000,10000,0,0,130,24,27,4096,1757,0,0,0,65536,0,0,65536,0,0
73,730000,10000,0,0,134,26,21,4096,1757,0,0,0,65536,0,0,65536,0,0
1,10000,18446744073708831616,0,0,117,4,4,4096,0,0,4895412794951728796,7,65536,0,0,65536,0,0
2,20000,10000,0,0,78,10,7,4096,0,0,0,8,65536,0,0,65536,0,0
3,30000,10000,0,0,101,13,7,4096,0,0,0,10,65536,0,0,65536,0,0
4,40000,10000,0,0,63,19,8,4096,0,0,0,11,65536,0,0,65536,0,0
5,50000,10000,0,0,92,25,8,4096,2,0,0,13,65536,0,0,65536,0,0
1,10000,18446744073708831616,0,0,117,4,4,4096,0,0,4895412794951728796,8,65536,0,0,65536,0,0
2,20000,10000,0,0,78,10,7,4096,0,0,0,10,65536,0,0,65536,0,0
3,30000,10000,0,0,101,13,7,4096,0,0,0,12,65536,0,0,65536,0,0
4,40000,10000,0,0,63,19,8,4096,0,0,0,13,65536,0,0,65536,0,0
5,50000,10000,0,0,92,25,8,4096,2,0,0,15,65536,0,0,65536,0,0
6,60000,10000,0,0,64,27,8,4096,2,0,0,17,65536,0,0,65536,0,0
7,70000,10000,0,0,228,32,8,4096,210,0,0,22,65536,0,0,65536,0,0
7,70000,10000,0,0,228,32,8,4096,210,0,0,21,65536,0,0,65536,0,0
8,80000,10000,0,0,256,34,9,4096,466,0,0,22,65536,0,0,65536,0,0
9,90000,10000,0,0,256,36,10,4096,722,0,0,23,65536,0,0,65536,0,0
9,90000,10000,0,0,256,36,10,4096,722,0,0,22,65536,0,0,65536,0,0
10,100000,10000,0,0,256,36,11,4096,978,0,0,23,65536,0,0,65536,0,0
11,110000,10000,0,0,256,36,11,4096,1234,0,0,24,65536,0,0,65536,0,0
12,120000,10000,0,0,256,36,12,4096,1490,0,0,25,65536,0,0,65536,0,0
13,130000,10000,0,0,256,37,12,4096,1746,0,0,25,65536,0,0,65536,0,0
14,140000,10000,0,0,230,39,12,4096,1949,0,0,31,65536,0,0,65536,0,0
15,150000,10000,0,0,256,39,13,4096,2204,0,0,31,65536,0,0,65536,0,0
16,160000,10000,0,0,256,39,14,4096,2459,0,0,32,65536,0,0,65536,0,0
17,170000,10000,0,0,256,39,15,4096,2713,0,0,34,65536,0,0,65536,0,0
18,180000,10000,0,0,256,39,15,4096,2969,0,0,35,65536,0,0,65536,0,0
19,190000,10000,0,0,256,39,16,4096,3224,0,0,37,65536,0,1,65536,0,0
20,200000,10000,0,0,256,41,17,4096,3480,0,0,38,65536,0,1,65536,0,0
21,210000,10000,0,0,256,41,17,4096,3736,0,0,38,65536,0,1,65536,0,0
22,220000,10000,0,0,256,41,18,4096,3992,0,0,39,65536,0,1,65536,0,0
23,230000,10000,0,0,256,41,19,4096,4096,0,0,40,65536,0,1,65536,0,0
24,240000,10000,0,0,256,41,20,4096,4096,0,0,41,65536,0,1,65536,0,0
25,250000,10000,0,0,256,43,20,2048,2048,0,0,42,65536,0,1,65536,0,0
26,260000,10000,0,0,256,45,21,2048,2048,0,0,42,65536,0,1,65536,0,0
27,270000,10000,0,0,256,45,22,1024,1024,0,0,44,65536,0,1,65536,0,0
28,280000,10000,0,0,256,45,23,1024,1024,0,0,45,65536,0,1,65536,0,0
29,290000,10000,0,0,256,45,24,512,512,0,0,46,65536,0,1,65536,0,0
30,300000,10000,0,0,256,45,24,512,512,0,0,47,65536,0,1,65536,0,0
31,310000,10000,0,0,256,45,25,256,256,0,0,47,65536,0,1,65536,0,0
32,320000,10000,0,0,255,45,26,256,256,0,0,50,65536,0,1,65536,0,0
33,330000,10000,0,0,256,45,27,256,256,0,0,50,65536,0,1,65536,0,0
34,340000,10000,0,0,256,45,27,256,256,0,0,52,65536,0,1,65536,0,0
35,350000,10000,0,0,256,45,28,256,256,0,0,53,65536,0,1,65536,0,0
36,360000,10000,0,0,256,45,29,256,256,0,0,54,65536,0,1,65536,0,0
11,110000,10000,0,0,256,36,11,4096,1234,0,0,23,65536,0,0,65536,0,0
12,120000,10000,0,0,256,36,12,4096,1490,0,0,24,65536,0,0,65536,0,0
13,130000,10000,0,0,256,37,12,4096,1746,0,0,24,65536,0,0,65536,0,0
14,140000,10000,0,0,230,39,12,4096,1949,0,0,26,65536,0,0,65536,0,0
15,150000,10000,0,0,256,39,13,4096,2204,0,0,27,65536,0,0,65536,0,0
16,160000,10000,0,0,256,39,14,4096,2459,0,0,27,65536,0,0,65536,0,0
17,170000,10000,0,0,256,39,15,4096,2713,0,0,29,65536,0,0,65536,0,0
18,180000,10000,0,0,256,39,15,4096,2969,0,0,29,65536,0,0,65536,0,0
19,190000,10000,0,0,256,39,16,4096,3224,0,0,31,65536,0,1,65536,0,0
20,200000,10000,0,0,256,41,17,4096,3480,0,0,31,65536,0,1,65536,0,0
21,210000,10000,0,0,256,41,17,4096,3736,0,0,32,65536,0,1,65536,0,0
22,220000,10000,0,0,256,41,18,4096,3992,0,0,32,65536,0,1,65536,0,0
23,230000,10000,0,0,256,41,19,4096,4096,0,0,34,65536,0,1,65536,0,0
24,240000,10000,0,0,256,41,20,4096,4096,0,0,34,65536,0,1,65536,0,0
25,250000,10000,0,0,256,43,20,2048,2048,0,0,35,65536,0,1,65536,0,0
26,260000,10000,0,0,256,45,21,2048,2048,0,0,36,65536,0,1,65536,0,0
27,270000,10000,0,0,256,45,22,1024,1024,0,0,36,65536,0,1,65536,0,0
28,280000,10000,0,0,256,45,23,1024,1024,0,0,37,65536,0,1,65536,0,0
29,290000,10000,0,0,256,45,24,512,512,0,0,38,65536,0,1,65536,0,0
30,300000,10000,0,0,256,45,24,512,512,0,0,38,65536,0,1,65536,0,0
31,310000,10000,0,0,256,45,25,256,256,0,0,39,65536,0,1,65536,0,0
32,320000,10000,0,0,255,45,26,256,256,0,0,41,65536,0,1,65536,0,0
33,330000,10000,0,0,256,45,27,256,256,0,0,41,65536,0,1,65536,0,0
34,340000,10000,0,0,256,45,27,256,256,0,0,43,65536,0,1,65536,0,0
35,350000,10000,0,0,256,45,28,256,256,0,0,44,65536,0,1,65536,0,0
36,360000,10000,0,0,256,45,29,256,256,0,0,44,65536,0,1,65536,0,0
1 tick_number elapsed_ns tick_interval_ns cache_hits_delta bucket_hits_delta word_executions_delta hot_word_count avg_word_heat_q48 window_width actual_window_size predicted_label_hits jitter_bits apic_ticks time_trust_q48 variance_q48 vm_call_depth_max hera_heat_q48 hermes_heat_q48 artemis_heat_q48
20 19 190000 10000 0 0 154 35 40 731 731 0 0 0 65536 0 0 65536 0 0
21 20 200000 10000 0 0 154 35 38 567 567 0 0 0 65536 0 0 65536 0 0
22 21 210000 10000 0 0 153 38 37 4096 0 0 0 0 65536 0 0 65536 0 0
23 22 220000 10000 0 0 167 40 38 38 582 582 0 0 0 65536 0 0 65536 0 0
24 23 230000 10000 0 0 176 17 11 38 37 685 685 0 0 0 65536 0 0 65536 0 0
25 24 240000 10000 0 0 175 10 25 731 731 0 0 0 65536 0 0 65536 0 0
26 25 250000 10000 0 0 196 11 23 731 731 0 0 0 65536 0 0 65536 0 0
27 26 260000 10000 0 0 192 14 24 4096 0 0 0 0 65536 0 0 65536 0 0
48 47 470000 10000 0 0 218 57 18 4096 198 0 0 0 65536 0 0 65536 0 0
49 48 480000 10000 0 0 221 60 20 4096 350 0 0 0 65536 0 0 65536 0 0
50 49 490000 10000 0 0 225 66 20 4096 528 0 0 0 65536 0 0 65536 0 0
51 50 500000 10000 0 0 214 69 21 22 4096 694 0 0 0 65536 0 0 65536 0 0
52 51 510000 10000 0 0 227 71 23 4096 883 0 0 0 65536 0 0 65536 0 0
53 52 520000 10000 0 0 208 71 23 24 4096 1043 0 0 0 65536 0 0 65536 0 0
54 53 530000 10000 0 0 207 71 25 4096 1202 0 0 0 65536 0 0 65536 0 0
55 54 540000 10000 0 0 200 71 26 4096 1319 0 0 0 65536 0 0 65536 0 0
56 55 550000 10000 0 0 205 72 27 4096 1464 0 0 0 65536 0 0 65536 0 0
57 56 560000 10000 0 0 211 73 27 4096 1620 0 0 0 65536 0 0 65536 0 0
58 57 570000 10000 0 0 193 80 28 29 4096 1712 0 0 0 65536 0 0 65536 0 0
59 58 580000 10000 0 0 185 4 61 4096 1757 0 0 0 65536 0 0 65536 0 0
60 59 590000 10000 0 0 81 7 32 4096 1757 0 0 0 65536 0 0 65536 0 0
61 60 600000 10000 0 0 52 10 28 4096 1757 0 0 0 65536 0 0 65536 0 0
72 71 710000 10000 0 0 44 22 39 4096 1757 0 0 0 65536 0 0 65536 0 0
73 72 720000 10000 0 0 130 24 27 4096 1757 0 0 0 65536 0 0 65536 0 0
74 73 730000 10000 0 0 134 26 21 4096 1757 0 0 0 65536 0 0 65536 0 0
75 1 10000 18446744073708831616 0 0 117 4 4 4096 0 0 4895412794951728796 7 8 65536 0 0 65536 0 0
76 2 20000 10000 0 0 78 10 7 4096 0 0 0 8 10 65536 0 0 65536 0 0
77 3 30000 10000 0 0 101 13 7 4096 0 0 0 10 12 65536 0 0 65536 0 0
78 4 40000 10000 0 0 63 19 8 4096 0 0 0 11 13 65536 0 0 65536 0 0
79 5 50000 10000 0 0 92 25 8 4096 2 0 0 13 15 65536 0 0 65536 0 0
80 6 60000 10000 0 0 64 27 8 4096 2 0 0 17 65536 0 0 65536 0 0
81 7 70000 10000 0 0 228 32 8 4096 210 0 0 22 21 65536 0 0 65536 0 0
82 8 80000 10000 0 0 256 34 9 4096 466 0 0 22 65536 0 0 65536 0 0
83 9 90000 10000 0 0 256 36 10 4096 722 0 0 23 22 65536 0 0 65536 0 0
84 10 100000 10000 0 0 256 36 11 4096 978 0 0 23 65536 0 0 65536 0 0
85 11 110000 10000 0 0 256 36 11 4096 1234 0 0 24 23 65536 0 0 65536 0 0
86 12 120000 10000 0 0 256 36 12 4096 1490 0 0 25 24 65536 0 0 65536 0 0
87 13 130000 10000 0 0 256 37 12 4096 1746 0 0 25 24 65536 0 0 65536 0 0
88 14 140000 10000 0 0 230 39 12 4096 1949 0 0 31 26 65536 0 0 65536 0 0
89 15 150000 10000 0 0 256 39 13 4096 2204 0 0 31 27 65536 0 0 65536 0 0
90 16 160000 10000 0 0 256 39 14 4096 2459 0 0 32 27 65536 0 0 65536 0 0
91 17 170000 10000 0 0 256 39 15 4096 2713 0 0 34 29 65536 0 0 65536 0 0
92 18 180000 10000 0 0 256 39 15 4096 2969 0 0 35 29 65536 0 0 65536 0 0
93 19 190000 10000 0 0 256 39 16 4096 3224 0 0 37 31 65536 0 1 65536 0 0
94 20 200000 10000 0 0 256 41 17 4096 3480 0 0 38 31 65536 0 1 65536 0 0
95 21 210000 10000 0 0 256 41 17 4096 3736 0 0 38 32 65536 0 1 65536 0 0
96 22 220000 10000 0 0 256 41 18 4096 3992 0 0 39 32 65536 0 1 65536 0 0
97 23 230000 10000 0 0 256 41 19 4096 4096 0 0 40 34 65536 0 1 65536 0 0
98 24 240000 10000 0 0 256 41 20 4096 4096 0 0 41 34 65536 0 1 65536 0 0
99 25 250000 10000 0 0 256 43 20 2048 2048 0 0 42 35 65536 0 1 65536 0 0
100 26 260000 10000 0 0 256 45 21 2048 2048 0 0 42 36 65536 0 1 65536 0 0
101 27 270000 10000 0 0 256 45 22 1024 1024 0 0 44 36 65536 0 1 65536 0 0
102 28 280000 10000 0 0 256 45 23 1024 1024 0 0 45 37 65536 0 1 65536 0 0
103 29 290000 10000 0 0 256 45 24 512 512 0 0 46 38 65536 0 1 65536 0 0
104 30 300000 10000 0 0 256 45 24 512 512 0 0 47 38 65536 0 1 65536 0 0
105 31 310000 10000 0 0 256 45 25 256 256 0 0 47 39 65536 0 1 65536 0 0
106 32 320000 10000 0 0 255 45 26 256 256 0 0 50 41 65536 0 1 65536 0 0
107 33 330000 10000 0 0 256 45 27 256 256 0 0 50 41 65536 0 1 65536 0 0
108 34 340000 10000 0 0 256 45 27 256 256 0 0 52 43 65536 0 1 65536 0 0
109 35 350000 10000 0 0 256 45 28 256 256 0 0 53 44 65536 0 1 65536 0 0
110 36 360000 10000 0 0 256 45 29 256 256 0 0 54 44 65536 0 1 65536 0 0