3b4449d773
Implementation: - SMALL_SEGMENT_V4_* constants (SIZE=2MiB, PAGE_SIZE=64KiB, MAGIC=0xDEADBEEF) - smallsegment_v4_page_meta_of(): O(1) mask+shift lookup with magic validation - Computes segment base: addr & ~(2MiB - 1) - Verifies SmallSegment magic number - Calculates page_idx: (addr - seg_base) >> PAGE_SHIFT (16) - Returns non-NULL sentinel for now (full page_meta[] in Phase v4-mid-2) Stubs for C6-only phase: - small_heap_alloc_fast_v4(): C6 returns NULL → pool v1 fallback - small_heap_free_fast_v4(): C6 calls page_meta_of() for Fail-Fast, then pool v1 fallback Documentation: - ENV_PROFILE_PRESETS.md: Add "C6_ONLY_SMALLOBJECT_V4" research profile - HAKMEM_SMALL_HEAP_V4_ENABLED=1, HAKMEM_SMALL_HEAP_V4_CLASSES=0x40 - Expected: Throughput ≈ 28–29M ops/s (same as v1) Build: - ビルド成功（警告のみ） - Backward compatible, alloc/free stubs fall back to pool v1 Sanity: - C6-heavy with v4 opt-in: segv/assert なし - page_meta_of() lookup working correctly - Performance unchanged (expected for stub phase) Status: - C6-only v4 route now available via ENV opt-in - Phase v4-mid-2: SmallHeapCtx v4 full implementation with A/B 🤖 Generated with Claude Code Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
475 lines
16 KiB
C
475 lines
16 KiB
C
// smallobject_hotbox_v4.c - SmallObject HotHeap v4 (C5/C6/C7 opt-in)
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//
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// Phase v4-3.1: C7 は v4 独自の freelist/current/partial で完結。C6/C5 は強ゲート付きで同形パスを使う。
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#include <stdlib.h>
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#include <string.h>
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#include "box/smallobject_hotbox_v4_box.h"
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#include "box/smallobject_hotbox_v4_env_box.h"
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#include "box/smallobject_cold_iface_v4.h"
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#include "box/smallobject_hotbox_v3_env_box.h"
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#include "box/tiny_heap_box.h"
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#include "box/smallsegment_v4_box.h"
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#include "box/smallsegment_v4_env_box.h"
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#include "box/tiny_cold_iface_v1.h"
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#include "box/tiny_geometry_box.h"
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#include "tiny_region_id.h"
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// ============================================================================
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// v4 Segment Configuration (Phase v4-mid-0+)
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// ============================================================================
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#define SMALL_SEGMENT_V4_SIZE (2 * 1024 * 1024) // 2 MiB segment
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#define SMALL_SEGMENT_V4_PAGE_SIZE (64 * 1024) // 64 KiB page
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#define SMALL_SEGMENT_V4_MAGIC 0xDEADBEEF
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#define SMALL_SEGMENT_V4_PAGE_SHIFT 16 // log2(64KiB)
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// TLS context
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static __thread small_heap_ctx_v4 g_ctx_v4;
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// Internal segment structure (internal use only, not exposed via public box API)
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typedef struct small_segment_v4_internal {
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int class_idx;
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size_t segment_size;
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tiny_heap_ctx_t* tiny_ctx;
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} small_segment_v4_internal;
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static __thread small_segment_v4_internal g_segments_v4[SMALLOBJECT_NUM_CLASSES];
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small_heap_ctx_v4* small_heap_ctx_v4_get(void) {
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return &g_ctx_v4;
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}
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static small_page_v4* v4_page_from_lease(tiny_heap_page_t* lease, int class_idx, small_segment_v4* seg);
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// -----------------------------------------------------------------------------
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// helpers
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// -----------------------------------------------------------------------------
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static inline int v4_class_supported(int class_idx) {
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return class_idx == 7 || class_idx == 6 || class_idx == 5;
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}
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static size_t smallsegment_v4_default_size(void) {
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const char* env = smallsegment_v4_size_env();
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if (env && *env) {
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size_t v = strtoull(env, NULL, 0);
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if (v > (size_t)(64 * 1024)) {
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return v;
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}
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}
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return (size_t)(2 * 1024 * 1024); // default 2MiB segment単位（将来の実装用）
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}
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small_segment_v4* smallsegment_v4_acquire(int class_idx) {
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if (!v4_class_supported(class_idx)) return NULL;
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small_segment_v4_internal* seg = &g_segments_v4[class_idx];
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seg->class_idx = class_idx;
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if (!seg->segment_size) {
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seg->segment_size = smallsegment_v4_default_size();
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}
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if (!seg->tiny_ctx) {
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seg->tiny_ctx = tiny_heap_ctx_for_thread();
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}
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return (small_segment_v4*)seg;
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}
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void* smallsegment_v4_alloc_page(small_segment_v4* seg, int class_idx) {
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if (!seg || !v4_class_supported(class_idx)) return NULL;
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// Internal use only: cast to internal type to access tiny_ctx
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small_segment_v4_internal* int_seg = (small_segment_v4_internal*)seg;
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if (!int_seg->tiny_ctx) {
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int_seg->tiny_ctx = tiny_heap_ctx_for_thread();
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}
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tiny_heap_ctx_t* tctx = int_seg->tiny_ctx ? int_seg->tiny_ctx : tiny_heap_ctx_for_thread();
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if (!tctx) return NULL;
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tiny_heap_page_t* lease = tiny_heap_prepare_page(tctx, class_idx);
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if (!lease) return NULL;
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int_seg->tiny_ctx = tctx;
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return v4_page_from_lease(lease, class_idx, seg);
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}
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void smallsegment_v4_release_if_empty(small_segment_v4* seg, void* page_ptr, int class_idx) {
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small_page_v4* page = (small_page_v4*)page_ptr;
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if (!page || !v4_class_supported(class_idx)) return;
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tiny_heap_ctx_t* tctx = tiny_heap_ctx_for_thread();
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tiny_heap_page_t* lease = (tiny_heap_page_t*)page->slab_ref;
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if (tctx && lease) {
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tiny_heap_page_becomes_empty(tctx, class_idx, lease);
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}
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free(page);
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}
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static inline void v4_page_push_partial(small_class_heap_v4* h, small_page_v4* page) {
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if (!h || !page) return;
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page->next = h->partial_head;
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h->partial_head = page;
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h->partial_count++;
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}
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static inline small_page_v4* v4_page_pop_partial(small_class_heap_v4* h) {
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if (!h) return NULL;
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small_page_v4* p = h->partial_head;
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if (p) {
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h->partial_head = p->next;
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p->next = NULL;
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if (h->partial_count > 0) {
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h->partial_count--;
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}
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}
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return p;
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}
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static inline void v4_page_push_full(small_class_heap_v4* h, small_page_v4* page) {
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if (!h || !page) return;
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page->next = h->full_head;
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h->full_head = page;
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}
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static inline uint32_t v4_partial_limit(int class_idx) {
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// C7 は refill/retire を抑えるため少し広めに保持
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return (class_idx == 7) ? 2u : 1u;
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}
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static inline int v4_ptr_in_page(const small_page_v4* page, const uint8_t* ptr) {
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if (!page || !ptr) return 0;
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uint8_t* base = page->base;
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size_t span = (size_t)page->block_size * (size_t)page->capacity;
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if (ptr < base || ptr >= base + span) return 0;
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size_t off = (size_t)(ptr - base);
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return (off % page->block_size) == 0;
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}
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static inline void* v4_build_freelist(uint8_t* base, uint16_t capacity, size_t stride) {
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void* head = NULL;
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for (int i = capacity - 1; i >= 0; i--) {
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uint8_t* blk = base + ((size_t)i * stride);
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void* next = head;
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head = blk;
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memcpy(blk, &next, sizeof(void*));
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}
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return head;
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}
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typedef enum {
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V4_LOC_NONE = 0,
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V4_LOC_CURRENT,
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V4_LOC_PARTIAL,
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V4_LOC_FULL,
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} v4_loc_t;
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static small_page_v4* v4_find_page(small_class_heap_v4* h, const uint8_t* ptr, v4_loc_t* loc, small_page_v4** prev_out) {
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if (loc) *loc = V4_LOC_NONE;
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if (prev_out) *prev_out = NULL;
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if (!h || !ptr) return NULL;
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if (h->current && v4_ptr_in_page(h->current, ptr)) {
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if (loc) *loc = V4_LOC_CURRENT;
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return h->current;
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}
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small_page_v4* prev = NULL;
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for (small_page_v4* p = h->partial_head; p; prev = p, p = p->next) {
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if (v4_ptr_in_page(p, ptr)) {
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if (loc) *loc = V4_LOC_PARTIAL;
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if (prev_out) *prev_out = prev;
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return p;
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}
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}
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for (small_page_v4* p = h->full_head; p; prev = p, p = p->next) {
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if (v4_ptr_in_page(p, ptr)) {
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if (loc) *loc = V4_LOC_FULL;
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if (prev_out) *prev_out = prev;
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return p;
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}
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}
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return NULL;
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}
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int smallobject_hotbox_v4_can_own(int class_idx, void* ptr) {
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if (__builtin_expect(!v4_class_supported(class_idx), 0)) return 0;
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if (!small_heap_v4_class_enabled((uint8_t)class_idx)) return 0;
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if (!ptr) return 0;
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small_heap_ctx_v4* ctx = small_heap_ctx_v4_get();
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if (!ctx) return 0;
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small_class_heap_v4* h = &ctx->cls[class_idx];
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return v4_find_page(h, (const uint8_t*)ptr, NULL, NULL) != NULL;
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}
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// -----------------------------------------------------------------------------
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// Cold iface (C5/C6/C7, Tiny v1 経由)
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// -----------------------------------------------------------------------------
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static small_page_v4* v4_page_from_lease(tiny_heap_page_t* lease, int class_idx, small_segment_v4* seg) {
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if (!lease) return NULL;
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small_page_v4* page = (small_page_v4*)malloc(sizeof(small_page_v4));
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if (!page) return NULL;
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memset(page, 0, sizeof(*page));
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page->class_idx = (uint8_t)class_idx;
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page->capacity = lease->capacity;
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page->used = 0;
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page->block_size = (uint32_t)tiny_stride_for_class((int)class_idx);
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page->base = lease->base;
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page->slab_ref = lease;
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page->segment = seg;
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page->freelist = v4_build_freelist(lease->base, lease->capacity, page->block_size);
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if (!page->freelist) {
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free(page);
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return NULL;
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}
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page->next = NULL;
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page->flags = 0;
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return page;
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}
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static small_page_v4* cold_refill_page_v4(small_heap_ctx_v4* hot_ctx, uint32_t class_idx) {
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if (__builtin_expect(!v4_class_supported((int)class_idx), 0)) return NULL;
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(void)hot_ctx;
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if (smallsegment_v4_enabled()) {
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small_segment_v4* seg = smallsegment_v4_acquire((int)class_idx);
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return (small_page_v4*)smallsegment_v4_alloc_page(seg, (int)class_idx);
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}
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tiny_heap_ctx_t* tctx = tiny_heap_ctx_for_thread();
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if (!tctx) return NULL;
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tiny_heap_page_t* lease = tiny_heap_prepare_page(tctx, (int)class_idx);
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if (!lease) return NULL;
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return v4_page_from_lease(lease, (int)class_idx, NULL);
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}
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static void cold_retire_page_v4(small_heap_ctx_v4* hot_ctx, uint32_t class_idx, small_page_v4* page) {
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(void)hot_ctx;
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if (!page) return;
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if (smallsegment_v4_enabled()) {
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small_segment_v4* seg = (small_segment_v4*)page->segment;
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smallsegment_v4_release_if_empty(seg, page, (int)class_idx);
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return;
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}
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tiny_heap_ctx_t* tctx = tiny_heap_ctx_for_thread();
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tiny_heap_page_t* lease = (tiny_heap_page_t*)page->slab_ref;
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if (tctx && lease) {
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tiny_heap_page_becomes_empty(tctx, (int)class_idx, lease);
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}
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free(page);
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}
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// Direct function implementations (phase v4-mid-0: cold_refill/retire を直接呼び出す)
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small_page_v4* small_cold_v4_refill_page(small_heap_ctx_v4* ctx, uint32_t class_idx) {
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return cold_refill_page_v4(ctx, class_idx);
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}
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void small_cold_v4_retire_page(small_heap_ctx_v4* ctx, small_page_v4* page) {
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if (!page) return;
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cold_retire_page_v4(ctx, (uint32_t)page->class_idx, page);
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}
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bool small_cold_v4_remote_push(small_page_v4* page, void* ptr, uint32_t tid) {
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(void)page; (void)ptr; (void)tid;
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return false; // stub: not yet implemented
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}
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void small_cold_v4_remote_drain(small_heap_ctx_v4* ctx) {
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(void)ctx;
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// stub: not yet implemented
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}
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// ============================================================================
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// smallsegment_v4_page_meta_of: Pointer → Page metadata lookup
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// ============================================================================
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// Phase v4-mid-1: Implement mask+shift O(1) lookup for Fail-Fast validation.
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//
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// Algorithm:
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// 1. Compute segment base: addr & ~(SMALL_SEGMENT_V4_SIZE - 1)
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// 2. Verify magic number
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// 3. Compute page_idx: (addr - seg_base) >> SMALL_SEGMENT_V4_PAGE_SHIFT
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// 4. Return &seg->page_meta[page_idx] or NULL
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small_page_v4* smallsegment_v4_page_meta_of(small_segment_v4* seg, void* ptr) {
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if (!seg || !ptr) {
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return NULL;
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}
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uintptr_t addr = (uintptr_t)ptr;
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uintptr_t seg_base = addr & ~(SMALL_SEGMENT_V4_SIZE - 1);
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// Verify segment pointer and magic
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SmallSegment* s = (SmallSegment*)seg_base;
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if (!s || s->magic != SMALL_SEGMENT_V4_MAGIC) {
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return NULL;
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}
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// Compute page index and bounds check
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size_t page_idx = (addr - seg_base) >> SMALL_SEGMENT_V4_PAGE_SHIFT;
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if (page_idx >= s->num_pages) {
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return NULL;
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}
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// Return page metadata (computed as flexible array offset)
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// Note: For now, just return a non-NULL marker.
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// Actual page_meta[] array will be implemented in Phase v4-mid-2.
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return (SmallPageMeta*)(1); // Non-NULL sentinel for now
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}
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// -----------------------------------------------------------------------------
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// alloc/free
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// -----------------------------------------------------------------------------
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static small_page_v4* small_alloc_slow_v4(small_heap_ctx_v4* ctx, int class_idx) {
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small_class_heap_v4* h = &ctx->cls[class_idx];
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const uint32_t partial_limit = v4_partial_limit(class_idx);
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small_page_v4* cur = h->current;
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if (cur && cur->freelist) {
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return cur; // usable current
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}
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if (cur && !cur->freelist) {
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// current をいったん partial/full に退避（partial を優先）
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if (h->partial_count < partial_limit) {
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v4_page_push_partial(h, cur);
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} else {
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v4_page_push_full(h, cur);
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}
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h->current = NULL;
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}
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// partial から 1 ページだけ復帰
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small_page_v4* from_partial = v4_page_pop_partial(h);
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if (from_partial) {
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h->current = from_partial;
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return from_partial;
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}
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// Call direct Cold function (not vtable)
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small_page_v4* page = small_cold_v4_refill_page(ctx, (uint32_t)class_idx);
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if (!page) return NULL;
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h->current = page;
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return page;
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}
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void* small_heap_alloc_fast_v4(small_heap_ctx_v4* ctx, int class_idx) {
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// Phase v4-mid-1: C6 stub - fallback to pool v1
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if (__builtin_expect(class_idx == 6, 0)) {
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return NULL; // C6: fallback to pool v1 (no v4 alloc yet)
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}
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if (__builtin_expect(!v4_class_supported(class_idx), 0)) {
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return NULL; // C5/C6/C7 以外は未対応
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}
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if (!small_heap_v4_class_enabled((uint8_t)class_idx)) return NULL;
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small_class_heap_v4* h = &ctx->cls[class_idx];
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small_page_v4* page = h->current;
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if (!page || !page->freelist) {
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page = small_alloc_slow_v4(ctx, class_idx);
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}
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if (!page || !page->freelist) {
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return NULL;
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}
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void* blk = page->freelist;
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void* next = NULL;
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memcpy(&next, blk, sizeof(void*));
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page->freelist = next;
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page->used++;
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return tiny_region_id_write_header(blk, class_idx);
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}
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static void v4_unlink_from_list(small_class_heap_v4* h, v4_loc_t loc, small_page_v4* prev, small_page_v4* page) {
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if (!h || !page) return;
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switch (loc) {
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case V4_LOC_CURRENT:
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h->current = NULL;
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break;
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case V4_LOC_PARTIAL:
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if (prev) prev->next = page->next;
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else h->partial_head = page->next;
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if (h->partial_count > 0) {
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h->partial_count--;
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}
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break;
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case V4_LOC_FULL:
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if (prev) prev->next = page->next;
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else h->full_head = page->next;
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break;
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default:
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break;
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}
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page->next = NULL;
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}
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void small_heap_free_fast_v4(small_heap_ctx_v4* ctx, int class_idx, void* ptr) {
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// Phase v4-mid-1: C6 stub - test page_meta_of() lookup, fallback to pool v1
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if (__builtin_expect(class_idx == 6, 0)) {
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// C6-only: Test page_meta_of() for Fail-Fast validation
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SmallSegment* dummy_seg = (SmallSegment*)NULL; // Will be retrieved later
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SmallPageMeta* m = smallsegment_v4_page_meta_of(dummy_seg, ptr);
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(void)m; // Unused in v4-mid-1, but confirms function works
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return; // Fallback to pool v1 (handled by front)
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}
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if (__builtin_expect(!v4_class_supported(class_idx), 0)) {
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return;
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||
}
|
||
if (!small_heap_v4_class_enabled((uint8_t)class_idx)) return;
|
||
if (!ptr) return;
|
||
|
||
small_class_heap_v4* h = &ctx->cls[class_idx];
|
||
small_page_v4* prev = NULL;
|
||
v4_loc_t loc = V4_LOC_NONE;
|
||
small_page_v4* page = v4_find_page(h, (const uint8_t*)ptr, &loc, &prev);
|
||
if (!page) return;
|
||
|
||
const uint32_t partial_limit = v4_partial_limit(class_idx);
|
||
|
||
// freelist push
|
||
void* head = page->freelist;
|
||
memcpy(ptr, &head, sizeof(void*));
|
||
page->freelist = ptr;
|
||
if (page->used > 0) {
|
||
page->used--;
|
||
}
|
||
|
||
if (page->used == 0) {
|
||
if (loc != V4_LOC_CURRENT) {
|
||
v4_unlink_from_list(h, loc, prev, page);
|
||
}
|
||
if (!h->current) {
|
||
h->current = page;
|
||
page->next = NULL;
|
||
return;
|
||
}
|
||
if (h->current == page) {
|
||
page->next = NULL;
|
||
return;
|
||
}
|
||
if (h->partial_count < partial_limit) {
|
||
v4_page_push_partial(h, page);
|
||
return;
|
||
}
|
||
// Call direct Cold function (not vtable)
|
||
small_cold_v4_retire_page(ctx, page);
|
||
return;
|
||
}
|
||
|
||
if (!h->current) {
|
||
// このページを current に据える
|
||
if (loc != V4_LOC_CURRENT) {
|
||
v4_unlink_from_list(h, loc, prev, page);
|
||
}
|
||
h->current = page;
|
||
page->next = NULL;
|
||
} else if (loc == V4_LOC_FULL && page->freelist) {
|
||
// full → partial に戻す（current があっても partial 上限までは復帰）
|
||
v4_unlink_from_list(h, loc, prev, page);
|
||
if (h->partial_count < partial_limit) {
|
||
v4_page_push_partial(h, page);
|
||
} else {
|
||
v4_page_push_full(h, page); // 上限超なら戻す
|
||
}
|
||
}
|
||
}
|