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Phase 9-2: Remove Legacy Backend & Unify to Shared Pool (50M ops/s)

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- Removed Legacy Backend fallback; Shared Pool is now the sole backend.
- Removed Soft Cap limit in Shared Pool to allow full memory management.
- Implemented EMPTY slab recycling with batched meta->used decrement in remote drain.
- Updated tiny_free_local_box to return is_empty status for safe recycling.
- Fixed race condition in release path by removing from legacy list early.
- Achieved 50.3M ops/s in WS8192 benchmark (+200% vs baseline).
This commit is contained in:
Moe Charm (CI)
2025-12-01 13:47:23 +09:00
parent 3a040a545a
commit 0bc33dc4f5
7 changed files with 92 additions and 102 deletions
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17
core/box/free_local_box.c
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@ -19,11 +19,11 @@ void tiny_failfast_log(const char* stage,
void* ptr,
void* prev);
void tiny_free_local_box(SuperSlab* ss, int slab_idx, TinySlabMeta* meta, void* ptr, uint32_t my_tid) {
int tiny_free_local_box(SuperSlab* ss, int slab_idx, TinySlabMeta* meta, void* ptr, uint32_t my_tid) {
extern _Atomic uint64_t g_free_local_box_calls;
atomic_fetch_add_explicit(&g_free_local_box_calls, 1, memory_order_relaxed);
if (!(ss && ss->magic == SUPERSLAB_MAGIC)) return;
if (slab_idx < 0 || slab_idx >= ss_slabs_capacity(ss)) return;
if (!(ss && ss->magic == SUPERSLAB_MAGIC)) return 0;
if (slab_idx < 0 || slab_idx >= ss_slabs_capacity(ss)) return 0;
(void)my_tid;
// ✅ Phase E1-CORRECT: ALL classes have headers, calculate BASE pointer once
@ -177,11 +177,16 @@ void tiny_free_local_box(SuperSlab* ss, int slab_idx, TinySlabMeta* meta, void*
// Track local free (debug helpers may be no-op)
tiny_remote_track_on_local_free(ss, slab_idx, ptr, "local_free", my_tid);
meta->used--;
// BUGFIX Phase 9-2: Use atomic_fetch_sub to detect 1->0 transition reliably
// meta->used--; // old
uint16_t prev_used = atomic_fetch_sub_explicit(&meta->used, 1, memory_order_release);
int is_empty = (prev_used == 1); // Transitioned from 1 to 0
ss_active_dec_one(ss);
// Phase 12-1.1: EMPTY slab detection (immediate reuse optimization)
if (meta->used == 0) {
if (is_empty) {
// Slab became EMPTY → mark for highest-priority reuse
ss_mark_slab_empty(ss, slab_idx);
@ -206,4 +211,6 @@ void tiny_free_local_box(SuperSlab* ss, int slab_idx, TinySlabMeta* meta, void*
uint8_t cls0 = (meta && meta->class_idx < TINY_NUM_CLASSES) ? meta->class_idx : 0;
tiny_free_publish_first_free((int)cls0, ss, slab_idx);
}
return is_empty;
}