d54893ea1d
Step 2 & 3 Complete: - A/B test (Mixed 10-run): STATIC_ROUTE=0 (38.91M) → =1 (39.77M) = +2.20% avg - Median gain: +1.98% - Result: ✅ GO (exceeds +1.0% threshold) - Decision: ✅ ADOPT into MIXED_TINYV3_C7_SAFE preset - bench_profile.h line 77: HAKMEM_TINY_STATIC_ROUTE=1 default - Learner auto-disables static route when HAKMEM_SMALL_LEARNER_V7_ENABLED=1 Implementation Summary: - core/box/tiny_static_route_box.{h,c}: Research box (Step 1A) - core/front/malloc_tiny_fast.h: Route lookup integration (Step 1B, lines 249-256) - core/bench_profile.h: Bench sync + preset adoption Cumulative Phase 2-3 Gains: - B3 (Routing shape): +2.89% - B4 (Wrapper split): +1.47% - C3 (Static routing): +2.20% - Total: ~6.8% (35.2M → ~39.8M ops/s) Next: Phase 3 C1 (TLS Prefetch, expected +2-4%) 🤖 Generated with Claude Code Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
74 lines
2.6 KiB
C
74 lines
2.6 KiB
C
#define _GNU_SOURCE
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#include "wrapper_env_box.h"
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#include <stdlib.h>
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#include <string.h>
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wrapper_env_cfg_t g_wrapper_env = {.inited = 0, .step_trace = 0, .ld_safe_mode = 1, .free_wrap_trace = 0, .wrap_diag = 0, .wrap_shape = 0};
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static inline int env_flag(const char* name, int def) {
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const char* e = getenv(name);
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if (!e || *e == '\0') return def;
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return (*e != '0');
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}
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static inline int env_int(const char* name, int def) {
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const char* e = getenv(name);
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if (!e || *e == '\0') return def;
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char* end;
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long val = strtol(e, &end, 10);
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return (end != e) ? (int)val : def;
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}
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void wrapper_env_init_once(void) {
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// Atomic CAS to ensure exactly-once initialization
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static _Atomic int init_started = 0;
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int expected = 0;
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if (!atomic_compare_exchange_strong_explicit(&init_started, &expected, 1,
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memory_order_acq_rel,
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memory_order_relaxed)) {
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// Someone else is initializing or already initialized
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// Spin until they're done
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while (!__builtin_expect(g_wrapper_env.inited, 1)) {
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__builtin_ia32_pause();
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}
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return;
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}
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// We own the initialization
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g_wrapper_env.step_trace = env_flag("HAKMEM_STEP_TRACE", 0);
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g_wrapper_env.ld_safe_mode = env_int("HAKMEM_LD_SAFE", 1);
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g_wrapper_env.free_wrap_trace = env_flag("HAKMEM_FREE_WRAP_TRACE", 0);
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g_wrapper_env.wrap_diag = env_flag("HAKMEM_WRAP_DIAG", 0);
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g_wrapper_env.wrap_shape = env_flag("HAKMEM_WRAP_SHAPE", 0);
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// Mark as initialized last with memory barrier
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atomic_store_explicit(&g_wrapper_env.inited, 1, memory_order_release);
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}
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void wrapper_env_refresh_from_env(void) {
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// Ensure base init happened (constructor may have already done this)
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if (!g_wrapper_env.inited) {
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wrapper_env_init_once();
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return;
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}
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// Re-read ENV (bench_profile may have injected defaults via putenv)
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g_wrapper_env.step_trace = env_flag("HAKMEM_STEP_TRACE", 0);
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g_wrapper_env.ld_safe_mode = env_int("HAKMEM_LD_SAFE", 1);
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g_wrapper_env.free_wrap_trace = env_flag("HAKMEM_FREE_WRAP_TRACE", 0);
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g_wrapper_env.wrap_diag = env_flag("HAKMEM_WRAP_DIAG", 0);
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g_wrapper_env.wrap_shape = env_flag("HAKMEM_WRAP_SHAPE", 0);
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atomic_store_explicit(&g_wrapper_env.inited, 1, memory_order_release);
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}
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__attribute__((constructor(101)))
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static void wrapper_env_ctor(void) {
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// Constructor priority 101 runs early (libc uses 100+)
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// This ensures initialization before any malloc calls
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if (!g_wrapper_env.inited) {
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wrapper_env_init_once();
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}
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}
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