1b196b3ac0
Phase 4-2: - Add TinyC6UltraFreeTLS structure with 128-slot TLS freelist - Implement tiny_c6_ultra_free_fast/slow for C6 free hot path - Add c6_ultra_free_fast counter to FreePathStats - ENV gate: HAKMEM_TINY_C6_ULTRA_FREE_ENABLED (default: OFF) Phase 4-3: - Add segment learning on first C6 free via ss_fast_lookup() - Learn seg_base/seg_end from SuperSlab for range check - Increase cache capacity from 32 to 128 blocks Results: - Segment learning works: fast path captures blocks in segment - However, without alloc integration, cache fills up and overflows to legacy - Net effect: +1-3% (within noise range) - Drain strategy also tested: no benefit (equal overhead) Conclusion: - Free-only TLS cache is limited without alloc-side integration - Core v6 already has alloc/free integrated TLS (but -12% slower) - Keep as research box (ENV default OFF) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
#ifndef HAKMEM_FREE_PATH_STATS_BOX_H
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#define HAKMEM_FREE_PATH_STATS_BOX_H
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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typedef struct FreePathStats {
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uint64_t total_calls;
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uint64_t c7_ultra_fast;
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uint64_t c6_ultra_free_fast; // Phase 4-2: C6 ULTRA-free
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uint64_t smallheap_v3_fast;
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uint64_t smallheap_v6_fast;
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uint64_t tiny_heap_v1_fast;
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uint64_t pool_v1_fast;
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uint64_t remote_free;
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uint64_t super_lookup_called;
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uint64_t legacy_fallback;
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// Phase 4-1: Legacy per-class breakdown
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uint64_t legacy_by_class[8]; // C0-C7 の Legacy fallback 内訳
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} FreePathStats;
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// ENV gate
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static inline bool free_path_stats_enabled(void) {
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static int g_enabled = -1;
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if (__builtin_expect(g_enabled == -1, 0)) {
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const char* e = getenv("HAKMEM_FREE_PATH_STATS");
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g_enabled = (e && *e && *e != '0') ? 1 : 0;
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}
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return g_enabled;
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}
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// Global stats instance
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extern FreePathStats g_free_path_stats;
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// Increment macros (with unlikely guard)
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#define FREE_PATH_STAT_INC(field) \
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do { if (__builtin_expect(free_path_stats_enabled(), 0)) { \
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g_free_path_stats.field++; \
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} } while(0)
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#endif // HAKMEM_FREE_PATH_STATS_BOX_H
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