LithosAnanake/experiments/bare_metal/latest/amd64.csv at 48ab9945de06fff3d23c118b4798cec391ef5dc2

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Robert Allan JamesandClaude Sonnet 5 00e657019e stadium: make VM population bound RAM-derived, not a static array of 4

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>

2026-08-15 08:11:21 -04:00

7.4 KiB

Raw Blame History

1	tick_number	elapsed_ns	tick_interval_ns	word_executions_delta	hot_word_count	avg_word_heat_q48	window_width	actual_window_size	jitter_bits	apic_ticks	time_trust_q48	vm_call_depth_max	hera_heat_q48
2	1	10000	10000	183	4	45	731	731	0	0	65536	0	65536
3	2	20000	10000	173	5	44	582	582	0	0	65536	0	65536
4	3	30000	10000	184	6	60	582	582	0	0	65536	0	65536
5	4	40000	10000	174	8	71	4096	0	0	0	65536	0	65536
6	5	50000	10000	150	9	78	582	582	0	0	65536	0	65536
7	6	60000	10000	159	11	73	4096	0	0	0	65536	0	65536
8	7	70000	10000	188	15	71	685	685	0	0	65536	0	65536
9	8	80000	10000	214	16	83	685	685	0	0	65536	0	65536
10	9	90000	10000	216	19	82	4096	0	0	0	65536	0	65536
11	10	100000	10000	222	21	84	567	567	0	0	65536	0	65536
12	11	110000	10000	207	23	86	731	731	0	0	65536	0	65536
13	12	120000	10000	189	26	83	4096	0	0	0	65536	0	65536
14	13	130000	10000	221	28	80	731	731	0	0	65536	0	65536
15	14	140000	10000	204	29	83	685	685	0	0	65536	0	65536
16	15	150000	10000	203	30	82	731	731	0	0	65536	0	65536
17	16	160000	10000	201	32	83	567	567	0	0	65536	0	65536
18	17	170000	10000	190	34	86	731	731	0	0	65536	0	65536
19	18	180000	10000	170	35	73	582	582	0	0	65536	0	65536
20	19	190000	10000	154	35	40	731	731	0	0	65536	0	65536
21	20	200000	10000	154	35	38	567	567	0	0	65536	0	65536
22	21	210000	10000	153	38	37	4096	0	0	0	65536	0	65536
23	22	220000	10000	167	38	38	582	582	0	0	65536	0	65536
24	23	230000	10000	176	11	37	685	685	0	0	65536	0	65536
25	24	240000	10000	175	10	25	731	731	0	0	65536	0	65536
26	25	250000	10000	196	11	23	731	731	0	0	65536	0	65536
27	26	260000	10000	192	14	24	4096	0	0	0	65536	0	65536
28	27	270000	10000	158	16	30	685	685	0	0	65536	0	65536
29	28	280000	10000	158	17	23	4096	0	0	0	65536	0	65536
30	29	290000	10000	164	17	27	4096	0	0	0	65536	0	65536
31	30	300000	10000	154	18	26	685	685	0	0	65536	0	65536
32	31	310000	10000	172	6	25	582	582	0	0	65536	0	65536
33	32	320000	10000	180	9	22	567	567	0	0	65536	0	65536
34	33	330000	10000	145	11	29	567	567	0	0	65536	0	65536
35	34	340000	10000	203	14	30	582	582	0	0	65536	0	65536
36	35	350000	10000	154	16	36	731	731	0	0	65536	0	65536
37	36	360000	10000	144	18	32	4096	0	0	0	65536	0	65536
38	37	370000	10000	144	18	29	4096	0	0	0	65536	0	65536
39	38	380000	10000	132	18	28	4096	0	0	0	65536	0	65536
40	39	390000	10000	180	18	24	4096	0	0	0	65536	0	65536
41	40	400000	10000	220	23	20	4096	0	0	0	65536	0	65536
42	41	410000	10000	215	25	19	4096	24	0	0	65536	0	65536
43	42	420000	10000	208	32	20	4096	24	0	0	65536	0	65536
44	43	430000	10000	177	36	19	4096	24	0	0	65536	0	65536
45	44	440000	10000	199	42	20	4096	24	0	0	65536	0	65536
46	45	450000	10000	223	47	19	4096	30	0	0	65536	0	65536
47	46	460000	10000	202	50	17	4096	67	0	0	65536	0	65536
48	47	470000	10000	218	57	18	4096	198	0	0	65536	0	65536
49	48	480000	10000	221	60	20	4096	350	0	0	65536	0	65536
50	49	490000	10000	225	66	20	4096	528	0	0	65536	0	65536
51	50	500000	10000	214	69	22	4096	694	0	0	65536	0	65536
52	51	510000	10000	227	71	23	4096	883	0	0	65536	0	65536
53	52	520000	10000	208	71	24	4096	1043	0	0	65536	0	65536
54	53	530000	10000	207	71	25	4096	1202	0	0	65536	0	65536
55	54	540000	10000	200	71	26	4096	1319	0	0	65536	0	65536
56	55	550000	10000	205	72	27	4096	1464	0	0	65536	0	65536
57	56	560000	10000	211	73	27	4096	1620	0	0	65536	0	65536
58	57	570000	10000	193	80	29	4096	1712	0	0	65536	0	65536
59	58	580000	10000	185	4	61	4096	1757	0	0	65536	0	65536
60	59	590000	10000	81	7	32	4096	1757	0	0	65536	0	65536
61	60	600000	10000	52	10	28	4096	1757	0	0	65536	0	65536
62	61	610000	10000	63	17	25	4096	1757	0	0	65536	0	65536
63	62	620000	10000	85	19	24	4096	1757	0	0	65536	0	65536
64	63	630000	10000	68	20	23	4096	1757	0	0	65536	0	65536
65	64	640000	10000	39	20	23	4096	1757	0	0	65536	0	65536
66	65	650000	10000	45	20	25	4096	1757	0	0	65536	0	65536
67	66	660000	10000	42	20	29	4096	1757	0	0	65536	0	65536
68	67	670000	10000	47	20	31	4096	1757	0	0	65536	0	65536
69	68	680000	10000	43	20	34	4096	1757	0	0	65536	0	65536
70	69	690000	10000	48	20	35	4096	1757	0	0	65536	0	65536
71	70	700000	10000	48	21	38	4096	1757	0	0	65536	0	65536
72	71	710000	10000	44	22	39	4096	1757	0	0	65536	0	65536
73	72	720000	10000	130	24	27	4096	1757	0	0	65536	0	65536
74	73	730000	10000	134	26	21	4096	1757	0	0	65536	0	65536
75	1	10000	18446744073708831616	117	4	4	4096	0	4895412794951728796	8	65536	0	65536
76	2	20000	10000	78	10	7	4096	0	0	10	65536	0	65536
77	3	30000	10000	101	13	7	4096	0	0	12	65536	0	65536
78	4	40000	10000	63	19	8	4096	0	0	13	65536	0	65536
79	5	50000	10000	92	25	8	4096	2	0	15	65536	0	65536
80	6	60000	10000	64	27	8	4096	2	0	17	65536	0	65536
81	7	70000	10000	228	32	8	4096	210	0	21	65536	0	65536
82	8	80000	10000	256	34	9	4096	466	0	22	65536	0	65536
83	9	90000	10000	256	36	10	4096	722	0	22	65536	0	65536
84	10	100000	10000	256	36	11	4096	978	0	23	65536	0	65536
85	11	110000	10000	256	36	11	4096	1234	0	23	65536	0	65536
86	12	120000	10000	256	36	12	4096	1490	0	24	65536	0	65536
87	13	130000	10000	256	37	12	4096	1746	0	24	65536	0	65536
88	14	140000	10000	230	39	12	4096	1949	0	26	65536	0	65536
89	15	150000	10000	256	39	13	4096	2204	0	27	65536	0	65536
90	16	160000	10000	256	39	14	4096	2459	0	27	65536	0	65536
91	17	170000	10000	256	39	15	4096	2713	0	29	65536	0	65536
92	18	180000	10000	256	39	15	4096	2969	0	29	65536	0	65536
93	19	190000	10000	256	39	16	4096	3224	0	31	65536	1	65536
94	20	200000	10000	256	41	17	4096	3480	0	31	65536	1	65536
95	21	210000	10000	256	41	17	4096	3736	0	32	65536	1	65536
96	22	220000	10000	256	41	18	4096	3992	0	32	65536	1	65536
97	23	230000	10000	256	41	19	4096	4096	0	34	65536	1	65536
98	24	240000	10000	256	41	20	4096	4096	0	34	65536	1	65536
99	25	250000	10000	256	43	20	2048	2048	0	35	65536	1	65536
100	26	260000	10000	256	45	21	2048	2048	0	36	65536	1	65536
101	27	270000	10000	256	45	22	1024	1024	0	36	65536	1	65536
102	28	280000	10000	256	45	23	1024	1024	0	37	65536	1	65536
103	29	290000	10000	256	45	24	512	512	0	38	65536	1	65536
104	30	300000	10000	256	45	24	512	512	0	38	65536	1	65536
105	31	310000	10000	256	45	25	256	256	0	39	65536	1	65536
106	32	320000	10000	255	45	26	256	256	0	41	65536	1	65536
107	33	330000	10000	256	45	27	256	256	0	41	65536	1	65536
108	34	340000	10000	256	45	27	256	256	0	43	65536	1	65536
109	35	350000	10000	256	45	28	256	256	0	44	65536	1	65536
110	36	360000	10000	256	45	29	256	256	0	44	65536	1	65536

7.4 KiB Raw Blame History

7.4 KiB

Raw Blame History