bcfb4f6b59
Remove dead code: UltraHot, RingCache, FrontC23, Class5 Hotpath
...
(cherry-picked from 225b6fcc7, conflicts resolved)
2025-11-26 12:33:49 +09:00
25d963a4aa
Code Cleanup: Remove false positives, redundant validations, and reduce verbose logging
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Following the C7 stride upgrade fix (commit 23c0d9541✅ Successful (LTO warnings expected)
- Test: ✅ 10K iterations (1.87M ops/s, no crashes)
- NXT_MISALIGN false positives: ✅ Eliminated
## Files Modified
- core/tiny_nextptr.h - Disabled false positive NXT_MISALIGN check
- core/hakmem_tiny_refill_p0.inc.h - Removed redundant CARVE validation
- core/box/ss_legacy_backend_box.c - Removed redundant LEGACY validation
- core/hakmem_shared_pool.c - Made SP_FIX_GEOMETRY logging debug-only
## Impact
- **Code clarity**: Removed 43 lines of redundant validation code
- **Debug noise**: Reduced false positive diagnostics
- **Performance**: Eliminated overhead from redundant geometry checks
- **Maintainability**: Single source of truth for geometry validation
🧹 Generated with [Claude Code](https://claude.com/claude-code )
Co-Authored-By: Claude <noreply@anthropic.com >
2025-11-21 23:00:24 +09:00
6afaa5703a
Phase 12-1.1: EMPTY Slab Detection + Immediate Reuse (+13% improvement, 10.2M→11.5M ops/s)
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Implementation of Task-sensei Priority 1 recommendation: Add empty_mask to SuperSlab
for immediate EMPTY slab detection and reuse, reducing Stage 3 (mmap) overhead.
## Changes
### 1. SuperSlab Structure (core/superslab/superslab_types.h)
- Added `empty_mask` (uint32_t): Bitmap for EMPTY slabs (used==0)
- Added `empty_count` (uint8_t): Quick check for EMPTY slab availability
### 2. EMPTY Detection API (core/box/ss_hot_cold_box.h)
- Added `ss_is_slab_empty()`: Returns true if slab is completely EMPTY
- Added `ss_mark_slab_empty()`: Marks slab as EMPTY (highest reuse priority)
- Added `ss_clear_slab_empty()`: Removes EMPTY state when reactivated
- Updated `ss_update_hot_cold_indices()`: Classify EMPTY/Hot/Cold slabs
- Updated `ss_init_hot_cold()`: Initialize empty_mask/empty_count
### 3. Free Path Integration (core/box/free_local_box.c)
- After `meta->used--`, check if `meta->used == 0`
- If true, call `ss_mark_slab_empty()` to update empty_mask
- Enables immediate EMPTY detection on every free operation
### 4. Shared Pool Stage 0.5 (core/hakmem_shared_pool.c)
- New Stage 0.5 before Stage 1: Scan existing SuperSlabs for EMPTY slabs
- Iterate over `g_super_reg_by_class[class_idx][]` (first 16 entries)
- Check `ss->empty_count > 0` → scan `empty_mask` with `__builtin_ctz()`
- Reuse EMPTY slab directly, avoiding Stage 3 (mmap/lock overhead)
- ENV control: `HAKMEM_SS_EMPTY_REUSE=1` (default OFF for A/B testing)
- ENV tunable: `HAKMEM_SS_EMPTY_SCAN_LIMIT=N` (default 16 SuperSlabs)
## Performance Results
```
Benchmark: Random Mixed 256B (100K iterations)
OFF (default): 10.2M ops/s (baseline)
ON (ENV=1): 11.5M ops/s (+13.0% improvement) ✅
```
## Expected Impact (from Task-sensei analysis)
**Current bottleneck**:
- Stage 1: 2-5% hit rate (free list broken)
- Stage 2: 3-8% hit rate (rare UNUSED)
- Stage 3: 87-95% hit rate (lock + mmap overhead) ← bottleneck
**Expected with Phase 12-1.1**:
- Stage 0.5: 20-40% hit rate (EMPTY scan)
- Stage 1-2: 20-30% hit rate (combined)
- Stage 3: 30-50% hit rate (significantly reduced)
**Theoretical max**: 25M → 55-70M ops/s (+120-180%)
## Current Gap Analysis
**Observed**: 11.5M ops/s (+13%)
**Expected**: 55-70M ops/s (+120-180%)
**Gap**: Performance regression or missing complementary optimizations
Possible causes:
1. Phase 3d-C (25.1M→10.2M) regression - unrelated to this change
2. EMPTY scan overhead (16 SuperSlabs × empty_count check)
3. Missing Priority 2-5 optimizations (Lazy SS deallocation, etc.)
4. Stage 0.5 too conservative (scan_limit=16, should be higher?)
## Usage
```bash
# Enable EMPTY reuse optimization
export HAKMEM_SS_EMPTY_REUSE=1
# Optional: increase scan limit (trade-off: throughput vs latency)
export HAKMEM_SS_EMPTY_SCAN_LIMIT=32
./bench_random_mixed_hakmem 100000 256 42
```
## Next Steps
**Priority 1-A**: Investigate Phase 3d-C→12-1.1 regression (25.1M→10.2M)
**Priority 1-B**: Implement Phase 12-1.2 (Lazy SS deallocation) for complementary effect
**Priority 1-C**: Profile Stage 0.5 overhead (scan_limit tuning)
## Files Modified
Core implementation:
- `core/superslab/superslab_types.h` - empty_mask/empty_count fields
- `core/box/ss_hot_cold_box.h` - EMPTY detection/marking API
- `core/box/free_local_box.c` - Free path EMPTY detection
- `core/hakmem_shared_pool.c` - Stage 0.5 EMPTY scan
Documentation:
- `CURRENT_TASK.md` - Task-sensei investigation report
---
🎯 Generated with [Claude Code](https://claude.com/claude-code )
Co-Authored-By: Claude <noreply@anthropic.com >
Co-Authored-By: Task-sensei (investigation & design analysis)
2025-11-21 04:56:48 +09:00
ccf604778c
Front-Direct implementation: SS→FC direct refill + SLL complete bypass
...
## Summary
Implemented Front-Direct architecture with complete SLL bypass:
- Direct SuperSlab → FastCache refill (1-hop, bypasses SLL)
- SLL-free allocation/free paths when Front-Direct enabled
- Legacy path sealing (SLL inline opt-in, SFC cascade ENV-only)
## New Modules
- core/refill/ss_refill_fc.h (236 lines): Standard SS→FC refill entry point
- Remote drain → Freelist → Carve priority
- Header restoration for C1-C6 (NOT C0/C7)
- ENV: HAKMEM_TINY_P0_DRAIN_THRESH, HAKMEM_TINY_P0_NO_DRAIN
- core/front/fast_cache.h: FastCache (L1) type definition
- core/front/quick_slot.h: QuickSlot (L0) type definition
## Allocation Path (core/tiny_alloc_fast.inc.h)
- Added s_front_direct_alloc TLS flag (lazy ENV check)
- SLL pop guarded by: g_tls_sll_enable && !s_front_direct_alloc
- Refill dispatch:
- Front-Direct: ss_refill_fc_fill() → fastcache_pop() (1-hop)
- Legacy: sll_refill_batch_from_ss() → SLL → FC (2-hop, A/B only)
- SLL inline pop sealed (requires HAKMEM_TINY_INLINE_SLL=1 opt-in)
## Free Path (core/hakmem_tiny_free.inc, core/hakmem_tiny_fastcache.inc.h)
- FC priority: Try fastcache_push() first (same-thread free)
- tiny_fast_push() bypass: Returns 0 when s_front_direct_free || !g_tls_sll_enable
- Fallback: Magazine/slow path (safe, bypasses SLL)
## Legacy Sealing
- SFC cascade: Default OFF (ENV-only via HAKMEM_TINY_SFC_CASCADE=1)
- Deleted: core/hakmem_tiny_free.inc.bak, core/pool_refill_legacy.c.bak
- Documentation: ss_refill_fc_fill() promoted as CANONICAL refill entry
## ENV Controls
- HAKMEM_TINY_FRONT_DIRECT=1: Enable Front-Direct (SS→FC direct)
- HAKMEM_TINY_P0_DIRECT_FC_ALL=1: Same as above (alt name)
- HAKMEM_TINY_REFILL_BATCH=1: Enable batch refill (also enables Front-Direct)
- HAKMEM_TINY_SFC_CASCADE=1: Enable SFC cascade (default OFF)
- HAKMEM_TINY_INLINE_SLL=1: Enable inline SLL pop (default OFF, requires AGGRESSIVE_INLINE)
## Benchmarks (Front-Direct Enabled)
```bash
ENV: HAKMEM_BENCH_FAST_FRONT=1 HAKMEM_TINY_FRONT_DIRECT=1
HAKMEM_TINY_REFILL_BATCH=1 HAKMEM_TINY_P0_DIRECT_FC_ALL=1
HAKMEM_TINY_REFILL_COUNT_HOT=256 HAKMEM_TINY_REFILL_COUNT_MID=96
HAKMEM_TINY_BUMP_CHUNK=256
bench_random_mixed (16-1040B random, 200K iter):
256 slots: 1.44M ops/s (STABLE, 0 SEGV)
128 slots: 1.44M ops/s (STABLE, 0 SEGV)
bench_fixed_size (fixed size, 200K iter):
256B: 4.06M ops/s (has debug logs, expected >10M without logs)
128B: Similar (debug logs affect)
```
## Verification
- TRACE_RING test (10K iter): **0 SLL events** detected ✅
- Complete SLL bypass confirmed when Front-Direct=1
- Stable execution: 200K iterations × multiple sizes, 0 SEGV
## Next Steps
- Disable debug logs in hak_alloc_api.inc.h (call_num 14250-14280 range)
- Re-benchmark with clean Release build (target: 10-15M ops/s)
- 128/256B shortcut path optimization (FC hit rate improvement)
Co-Authored-By: ChatGPT <chatgpt@openai.com >
Suggested-By: ultrathink
2025-11-14 05:41:49 +09:00
fcf098857a
Phase12 debug: restore SUPERSLAB constants/APIs, implement Box2 drain boundary, fix tiny_fast_pop to return BASE, honor TLS SLL toggle in alloc/free fast paths, add fail-fast stubs, and quiet capacity sentinel. Update CURRENT_TASK with A/B results (SLL-off stable; SLL-on crash).
2025-11-14 01:02:00 +09:00
72b38bc994
Phase E3-FINAL: Fix Box API offset bugs - ALL classes now use correct offsets
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## Root Cause Analysis (GPT5)
**Physical Layout Constraints**:
- Class 0: 8B = [1B header][7B payload] → offset 1 = 9B needed = ❌ IMPOSSIBLE
- Class 1-6: >=16B = [1B header][15B+ payload] → offset 1 = ✅ POSSIBLE
- Class 7: 1KB → offset 0 (compatibility)
**Correct Specification**:
- HAKMEM_TINY_HEADER_CLASSIDX != 0:
- Class 0, 7: next at offset 0 (overwrites header when on freelist)
- Class 1-6: next at offset 1 (after header)
- HAKMEM_TINY_HEADER_CLASSIDX == 0:
- All classes: next at offset 0
**Previous Bug**:
- Attempted "ALL classes offset 1" unification
- Class 0 with offset 1 caused immediate SEGV (9B > 8B block size)
- Mixed 2-arg/3-arg API caused confusion
## Fixes Applied
### 1. Restored 3-Argument Box API (core/box/tiny_next_ptr_box.h)
```c
// Correct signatures
void tiny_next_write(int class_idx, void* base, void* next_value)
void* tiny_next_read(int class_idx, const void* base)
// Correct offset calculation
size_t offset = (class_idx == 0 || class_idx == 7) ? 0 : 1;
```
### 2. Updated 123+ Call Sites Across 34 Files
- hakmem_tiny_hot_pop_v4.inc.h (4 locations)
- hakmem_tiny_fastcache.inc.h (3 locations)
- hakmem_tiny_tls_list.h (12 locations)
- superslab_inline.h (5 locations)
- tiny_fastcache.h (3 locations)
- ptr_trace.h (macro definitions)
- tls_sll_box.h (2 locations)
- + 27 additional files
Pattern: `tiny_next_read(base)` → `tiny_next_read(class_idx, base)`
Pattern: `tiny_next_write(base, next)` → `tiny_next_write(class_idx, base, next)`
### 3. Added Sentinel Detection Guards
- tiny_fast_push(): Block nodes with sentinel in ptr or ptr->next
- tls_list_push(): Block nodes with sentinel in ptr or ptr->next
- Defense-in-depth against remote free sentinel leakage
## Verification (GPT5 Report)
**Test Command**: `./out/release/bench_random_mixed_hakmem --iterations=70000`
**Results**:
- ✅ Main loop completed successfully
- ✅ Drain phase completed successfully
- ✅ NO SEGV (previous crash at iteration 66151 is FIXED)
- ℹ️ Final log: "tiny_alloc(1024) failed" is normal fallback to Mid/ACE layers
**Analysis**:
- Class 0 immediate SEGV: ✅ RESOLVED (correct offset 0 now used)
- 66K iteration crash: ✅ RESOLVED (offset consistency fixed)
- Box API conflicts: ✅ RESOLVED (unified 3-arg API)
## Technical Details
### Offset Logic Justification
```
Class 0: 8B block → next pointer (8B) fits ONLY at offset 0
Class 1: 16B block → next pointer (8B) fits at offset 1 (after 1B header)
Class 2: 32B block → next pointer (8B) fits at offset 1
...
Class 6: 512B block → next pointer (8B) fits at offset 1
Class 7: 1024B block → offset 0 for legacy compatibility
```
### Files Modified (Summary)
- Core API: `box/tiny_next_ptr_box.h`
- Hot paths: `hakmem_tiny_hot_pop*.inc.h`, `tiny_fastcache.h`
- TLS layers: `hakmem_tiny_tls_list.h`, `hakmem_tiny_tls_ops.h`
- SuperSlab: `superslab_inline.h`, `tiny_superslab_*.inc.h`
- Refill: `hakmem_tiny_refill.inc.h`, `tiny_refill_opt.h`
- Free paths: `tiny_free_magazine.inc.h`, `tiny_superslab_free.inc.h`
- Documentation: Multiple Phase E3 reports
## Remaining Work
None for Box API offset bugs - all structural issues resolved.
Future enhancements (non-critical):
- Periodic `grep -R '*(void**)' core/` to detect direct pointer access violations
- Enforce Box API usage via static analysis
- Document offset rationale in architecture docs
🤖 Generated with [Claude Code](https://claude.com/claude-code )
Co-Authored-By: Claude <noreply@anthropic.com >
2025-11-13 06:50:20 +09:00
862e8ea7db
Infrastructure and build updates
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- Update build configuration and flags
- Add missing header files and dependencies
- Update TLS list implementation with proper scoping
- Fix various compilation warnings and issues
- Update debug ring and tiny allocation infrastructure
- Update benchmark results documentation
Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>
2025-11-11 21:49:05 +09:00
8feeb63c2b
release: silence runtime logs and stabilize benches
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- Fix HAKMEM_LOG gating to use (numeric) so release builds compile out logs.
- Switch remaining prints to HAKMEM_LOG or guard with :
- core/box/hak_core_init.inc.h (EVO sample warning, shutdown banner)
- core/hakmem_config.c (config/feature prints)
- core/hakmem.c (BigCache eviction prints)
- core/hakmem_tiny_superslab.c (OOM, head init/expand, C7 init diagnostics)
- core/hakmem_elo.c (init/evolution)
- core/hakmem_batch.c (init/flush/stats)
- core/hakmem_ace.c (33KB route diagnostics)
- core/hakmem_ace_controller.c (ACE logs macro → no-op in release)
- core/hakmem_site_rules.c (init banner)
- core/box/hak_free_api.inc.h (unknown method error → release-gated)
- Rebuilt benches and verified quiet output for release:
- bench_fixed_size_hakmem/system
- bench_random_mixed_hakmem/system
- bench_mid_large_mt_hakmem/system
- bench_comprehensive_hakmem/system
Note: Kept debug logs available in debug builds and when explicitly toggled via env.
2025-11-11 01:47:06 +09:00
1b6624dec4
Fix debug build: gate Tiny observation snapshot in hakmem_tiny_stats.c behind HAKMEM_TINY_OBS_ENABLE to avoid incomplete TinyObsStats and missing globals. Now debug build passes, enabling C7 triage with fail‑fast guards.
2025-11-10 03:00:00 +09:00
1010a961fb
Tiny: fix header/stride mismatch and harden refill paths
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- Root cause: header-based class indexing (HEADER_CLASSIDX=1) wrote a 1-byte
header during allocation, but linear carve/refill and initial slab capacity
still used bare class block sizes. This mismatch could overrun slab usable
space and corrupt freelists, causing reproducible SEGV at ~100k iters.
Changes
- Superslab: compute capacity with effective stride (block_size + header for
classes 0..6; class7 remains headerless) in superslab_init_slab(). Add a
debug-only bound check in superslab_alloc_from_slab() to fail fast if carve
would exceed usable bytes.
- Refill (non-P0 and P0): use header-aware stride for all linear carving and
TLS window bump operations. Ensure alignment/validation in tiny_refill_opt.h
also uses stride, not raw class size.
- Drain: keep existing defense-in-depth for remote sentinel and sanitize nodes
before splicing into freelist (already present).
Notes
- This unifies the memory layout across alloc/linear-carve/refill with a single
stride definition and keeps class7 (1024B) headerless as designed.
- Debug builds add fail-fast checks; release builds remain lean.
Next
- Re-run Tiny benches (256/1024B) in debug to confirm stability, then in
release. If any remaining crash persists, bisect with HAKMEM_TINY_P0_BATCH_REFILL=0
to isolate P0 batch carve, and continue reducing branch-miss as planned.
2025-11-09 18:55:50 +09:00
