hakmem

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Author	SHA1	Message	Date
Moe Charm (CI)	4ffdaae2fc	Add empty slab detection to drain: call shared_pool_release_slab Issue: - Drain was detecting meta->used==0 but not releasing slabs - Logic missing: shared_pool_release_slab() call after empty detection - Result: SuperSlabs not freed, LRU cache not populated Fix: - Added shared_pool_release_slab() call when meta->used==0 (line 194) - Mirrors logic in tiny_superslab_free.inc.h:223-236 - Empty slabs now released to shared pool Performance Impact (ws=4096, 200K iterations): - Before (baseline): 563K ops/s - After this fix: 5.9M ops/s (+950% improvement!) Note: LRU cache still not populated (investigating next) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>	2025-11-14 07:13:00 +09:00
Moe Charm (CI)	2ef28ee5ab	Fix drain box compilation: Use pthread_self() directly Issue: - tiny_self_u32() is static inline, cannot be linked from drain box - Link error: undefined reference to 'tiny_self_u32' Fix: - Use pthread_self() directly like hakmem_tiny_superslab.c:917 - Added <pthread.h> include - Changed extern declaration from size_t to const size_t 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>	2025-11-14 07:10:46 +09:00
Moe Charm (CI)	88f3592ef6	Option B: Periodic TLS SLL Drain - Fix Phase 9 LRU Architecture Issue Root Cause: - TLS SLL fast path (95-99% of frees) does NOT decrement meta->used - Slabs never appear empty → SuperSlabs never freed → LRU never used - Impact: 6,455 mmap/munmap calls per 200K iterations (74.8% time) - Performance: -94% regression (9.38M → 563K ops/s) Solution: - Periodic drain every N frees (default: 1024) per size class - Drain path: TLS SLL → slab freelist via tiny_free_local_box() - This properly decrements meta->used and enables empty detection Implementation: 1. core/box/tls_sll_drain_box.h - New drain box function - tiny_tls_sll_drain(): Pop from TLS SLL, push to slab freelist - tiny_tls_sll_try_drain(): Drain trigger with counter - ENV: HAKMEM_TINY_SLL_DRAIN_ENABLE=1/0 (default: 1) - ENV: HAKMEM_TINY_SLL_DRAIN_INTERVAL=N (default: 1024) - ENV: HAKMEM_TINY_SLL_DRAIN_DEBUG=1 (debug logging) 2. core/tiny_free_fast_v2.inc.h - Integrated drain trigger - Added drain call after successful TLS SLL push (line 145) - Cost: 2-3 cycles per free (counter increment + comparison) - Drain triggered every 1024 frees (0.1% overhead) Expected Impact: - mmap/munmap: 6,455 → ~100 calls (-96-97%) - Throughput: 563K → 8-10M ops/s (+1,300-1,700%) - LRU utilization: 0% → >90% (functional) Reference: PHASE9_LRU_ARCHITECTURE_ISSUE.md 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>	2025-11-14 07:09:18 +09:00

Author

SHA1

Message

Date

Moe Charm (CI)

4ffdaae2fc

Add empty slab detection to drain: call shared_pool_release_slab

Issue:
- Drain was detecting meta->used==0 but not releasing slabs
- Logic missing: shared_pool_release_slab() call after empty detection
- Result: SuperSlabs not freed, LRU cache not populated

Fix:
- Added shared_pool_release_slab() call when meta->used==0 (line 194)
- Mirrors logic in tiny_superslab_free.inc.h:223-236
- Empty slabs now released to shared pool

Performance Impact (ws=4096, 200K iterations):
- Before (baseline): 563K ops/s
- After this fix: 5.9M ops/s (+950% improvement!)

Note: LRU cache still not populated (investigating next)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-11-14 07:13:00 +09:00

Moe Charm (CI)

2ef28ee5ab

Fix drain box compilation: Use pthread_self() directly

Issue:
- tiny_self_u32() is static inline, cannot be linked from drain box
- Link error: undefined reference to 'tiny_self_u32'

Fix:
- Use pthread_self() directly like hakmem_tiny_superslab.c:917
- Added <pthread.h> include
- Changed extern declaration from size_t to const size_t

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-11-14 07:10:46 +09:00

Moe Charm (CI)

88f3592ef6

Option B: Periodic TLS SLL Drain - Fix Phase 9 LRU Architecture Issue

Root Cause:
- TLS SLL fast path (95-99% of frees) does NOT decrement meta->used
- Slabs never appear empty → SuperSlabs never freed → LRU never used
- Impact: 6,455 mmap/munmap calls per 200K iterations (74.8% time)
- Performance: -94% regression (9.38M → 563K ops/s)

Solution:
- Periodic drain every N frees (default: 1024) per size class
- Drain path: TLS SLL → slab freelist via tiny_free_local_box()
- This properly decrements meta->used and enables empty detection

Implementation:
1. core/box/tls_sll_drain_box.h - New drain box function
   - tiny_tls_sll_drain(): Pop from TLS SLL, push to slab freelist
   - tiny_tls_sll_try_drain(): Drain trigger with counter
   - ENV: HAKMEM_TINY_SLL_DRAIN_ENABLE=1/0 (default: 1)
   - ENV: HAKMEM_TINY_SLL_DRAIN_INTERVAL=N (default: 1024)
   - ENV: HAKMEM_TINY_SLL_DRAIN_DEBUG=1 (debug logging)

2. core/tiny_free_fast_v2.inc.h - Integrated drain trigger
   - Added drain call after successful TLS SLL push (line 145)
   - Cost: 2-3 cycles per free (counter increment + comparison)
   - Drain triggered every 1024 frees (0.1% overhead)

Expected Impact:
- mmap/munmap: 6,455 → ~100 calls (-96-97%)
- Throughput: 563K → 8-10M ops/s (+1,300-1,700%)
- LRU utilization: 0% → >90% (functional)

Reference: PHASE9_LRU_ARCHITECTURE_ISSUE.md

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-11-14 07:09:18 +09:00

3 Commits