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Raise EMPTY scan default to 32 SuperSlabs

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This commit is contained in:
Moe Charm (CI)
2025-11-30 12:17:32 +09:00
parent a592727b38
commit eee8c7f14b
1 changed files with 18 additions and 4 deletions
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22
core/hakmem_shared_pool.c
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@ -542,12 +542,17 @@ sp_acquire_from_empty_scan(int class_idx, SuperSlab** ss_out, int* slab_idx_out,
int reg_size = (class_idx < TINY_NUM_CLASSES) ? g_super_reg_class_size[class_idx] : 0;
static int scan_limit = -1;
if (__builtin_expect(scan_limit == -1, 0)) {
const char* e = getenv("HAKMEM_SS_EMPTY_SCAN_LIMIT");
scan_limit = (e && *e) ? atoi(e) : 16; // default: scan first 16 SuperSlabs
}
if (__builtin_expect(scan_limit == -1, 0)) {
const char* e = getenv("HAKMEM_SS_EMPTY_SCAN_LIMIT");
scan_limit = (e && *e) ? atoi(e) : 32; // default: scan first 32 SuperSlabs (Phase 9-2 tuning)
}
if (scan_limit > reg_size) scan_limit = reg_size;
// Stage 0.5 hit counter for visualization
static _Atomic uint64_t stage05_hits = 0;
static _Atomic uint64_t stage05_attempts = 0;
atomic_fetch_add_explicit(&stage05_attempts, 1, memory_order_relaxed);
for (int i = 0; i < scan_limit; i++) {
SuperSlab* ss = g_super_reg_by_class[class_idx][i];
if (!(ss && ss->magic == SUPERSLAB_MAGIC)) continue;
@ -582,6 +587,15 @@ sp_acquire_from_empty_scan(int class_idx, SuperSlab** ss_out, int* slab_idx_out,
if (g_sp_stage_stats_enabled) {
atomic_fetch_add(&g_sp_stage1_hits[class_idx], 1);
}
atomic_fetch_add_explicit(&stage05_hits, 1, memory_order_relaxed);
// Stage 0.5 hit rate visualization (every 100 hits)
uint64_t hits = atomic_load_explicit(&stage05_hits, memory_order_relaxed);
if (hits % 100 == 1) {
uint64_t attempts = atomic_load_explicit(&stage05_attempts, memory_order_relaxed);
fprintf(stderr, "[STAGE0.5_STATS] hits=%lu attempts=%lu rate=%.1f%% (scan_limit=%d)\n",
hits, attempts, (double)hits * 100.0 / attempts, scan_limit);
}
return 0;
}
}