hakmem

tomoaki/hakmem

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Author	SHA1	Message	Date
Moe Charm (CI)	87b7d30998	Phase 9: SuperSlab optimization & EMPTY slab recycling (WIP) Phase 9-1: O(1) SuperSlab lookup optimization - Created ss_addr_map_box: Hash table (8192 buckets) for O(1) SuperSlab lookup - Created ss_tls_hint_box: TLS caching layer for SuperSlab hints - Integrated hash table into registry (init, insert, remove, lookup) - Modified hak_super_lookup() to use new hash table - Expected: 50-80 cycles → 10-20 cycles (not verified - SuperSlab disabled by default) Phase 9-2: EMPTY slab recycling implementation - Created slab_recycling_box: SLAB_TRY_RECYCLE() macro following Box pattern - Integrated into remote drain (superslab_slab.c) - Integrated into TLS SLL drain (tls_sll_drain_box.h) with touched slab tracking - Observable: Debug tracing via HAKMEM_SLAB_RECYCLE_TRACE - Updated Makefile: Added new box objects to 3 build targets Known Issues: - SuperSlab registry exhaustion still occurs (unregistration not working) - shared_pool_release_slab() may not be removing from g_super_reg[] - Needs investigation before Phase 9-2 can be completed Expected Impact (when fixed): - Stage 1 hit rate: 0% → 80% - shared_fail events: 4 → 0 - Kernel overhead: 55% → 15% - Throughput: 16.5M → 25-30M ops/s (+50-80%) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>	2025-11-30 07:16:50 +09:00
Moe Charm (CI)	6ac6f5ae1b	Refactor: Split hakmem_tiny_superslab.c + unified backend exit point Major refactoring to improve maintainability and debugging: 1. Split hakmem_tiny_superslab.c (1521 lines) into 7 focused files: - superslab_allocate.c: SuperSlab allocation/deallocation - superslab_backend.c: Backend allocation paths (legacy, shared) - superslab_ace.c: ACE (Adaptive Cache Engine) logic - superslab_slab.c: Slab initialization and bitmap management - superslab_cache.c: LRU cache and prewarm cache management - superslab_head.c: SuperSlabHead management and expansion - superslab_stats.c: Statistics tracking and debugging 2. Created hakmem_tiny_superslab_internal.h for shared declarations 3. Added superslab_return_block() as single exit point for header writing: - All backend allocations now go through this helper - Prevents bugs where headers are forgotten in some paths - Makes future debugging easier 4. Updated Makefile for new file structure 5. Added header writing to ss_legacy_backend_box.c and ss_unified_backend_box.c (though not currently linked) Note: Header corruption bug in Larson benchmark still exists. Class 1-6 allocations go through TLS refill/carve paths, not backend. Further investigation needed. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>	2025-11-29 05:13:04 +09:00

Author

SHA1

Message

Date

Moe Charm (CI)

87b7d30998

Phase 9: SuperSlab optimization & EMPTY slab recycling (WIP)

Phase 9-1: O(1) SuperSlab lookup optimization
- Created ss_addr_map_box: Hash table (8192 buckets) for O(1) SuperSlab lookup
- Created ss_tls_hint_box: TLS caching layer for SuperSlab hints
- Integrated hash table into registry (init, insert, remove, lookup)
- Modified hak_super_lookup() to use new hash table
- Expected: 50-80 cycles → 10-20 cycles (not verified - SuperSlab disabled by default)

Phase 9-2: EMPTY slab recycling implementation
- Created slab_recycling_box: SLAB_TRY_RECYCLE() macro following Box pattern
- Integrated into remote drain (superslab_slab.c)
- Integrated into TLS SLL drain (tls_sll_drain_box.h) with touched slab tracking
- Observable: Debug tracing via HAKMEM_SLAB_RECYCLE_TRACE
- Updated Makefile: Added new box objects to 3 build targets

Known Issues:
- SuperSlab registry exhaustion still occurs (unregistration not working)
- shared_pool_release_slab() may not be removing from g_super_reg[]
- Needs investigation before Phase 9-2 can be completed

Expected Impact (when fixed):
- Stage 1 hit rate: 0% → 80%
- shared_fail events: 4 → 0
- Kernel overhead: 55% → 15%
- Throughput: 16.5M → 25-30M ops/s (+50-80%)

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

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

2025-11-30 07:16:50 +09:00

Moe Charm (CI)

6ac6f5ae1b

Refactor: Split hakmem_tiny_superslab.c + unified backend exit point

Major refactoring to improve maintainability and debugging:

1. Split hakmem_tiny_superslab.c (1521 lines) into 7 focused files:
   - superslab_allocate.c: SuperSlab allocation/deallocation
   - superslab_backend.c: Backend allocation paths (legacy, shared)
   - superslab_ace.c: ACE (Adaptive Cache Engine) logic
   - superslab_slab.c: Slab initialization and bitmap management
   - superslab_cache.c: LRU cache and prewarm cache management
   - superslab_head.c: SuperSlabHead management and expansion
   - superslab_stats.c: Statistics tracking and debugging

2. Created hakmem_tiny_superslab_internal.h for shared declarations

3. Added superslab_return_block() as single exit point for header writing:
   - All backend allocations now go through this helper
   - Prevents bugs where headers are forgotten in some paths
   - Makes future debugging easier

4. Updated Makefile for new file structure

5. Added header writing to ss_legacy_backend_box.c and
   ss_unified_backend_box.c (though not currently linked)

Note: Header corruption bug in Larson benchmark still exists.
Class 1-6 allocations go through TLS refill/carve paths, not backend.
Further investigation needed.

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

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

2025-11-29 05:13:04 +09:00

2 Commits