diff --git a/lib/bfdev b/lib/bfdev
index 0733bf5..ff25e88 160000
--- a/lib/bfdev
+++ b/lib/bfdev
@@ -1 +1 @@
-Subproject commit 0733bf5e47ed407368c20786d941d0a53939376e
+Subproject commit ff25e88564217e8819c4e73b9f4666a48d29d1c5
diff --git a/src/core/xdbd_pool.c b/src/core/xdbd_pool.c
index 6cb5e7b..9e8ceb3 100644
--- a/src/core/xdbd_pool.c
+++ b/src/core/xdbd_pool.c
@@ -1,39 +1,114 @@
-#include "bfdev/list.h"
-#include <bfdev/allocator.h>
-#include <xdbd_pool.h>
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright(c) 2024 John Sanpe <sanpeqf@gmail.com>
+ */
+
 #include <xdbd.h>
+#include <bfdev/align.h>
+#include <bfdev/bug.h>
 
-xdbd_pool_t *xdbd_create_pool() {
-    xdbd_pool_t *pool = NULL;
+static inline void *
+cache_alloc(xdbd_pool_t *pool, size_t size)
+{
+    xdbd_cache_t *cache;
+    void *retval;
 
-    pool = bfdev_malloc(NULL, sizeof(xdbd_pool_t));
-    if (pool == NULL) {
-        return NULL;
+    bfdev_align_high_adj(size, XDBD_ALIGN_SIZE);
+
+    cache = bfdev_slist_first_entry(&pool->cache, xdbd_cache_t, list);
+    if (bfdev_likely(cache)) {
+        retval = bfdev_allocpool_alloc(&cache->pool, size, 0);
+        if (bfdev_likely(cache))
+            return retval;
     }
 
-    bfdev_list_head_init(&pool->head);
-    return pool;
+    cache = bfdev_malloc(NULL, sizeof(*cache));
+    if (bfdev_unlikely(!cache))
+        return NULL;
+
+    retval = bfdev_malloc(NULL, XDBD_PAGE_SIZE);
+    if (bfdev_unlikely(!retval))
+        return NULL;
+
+    cache->data = retval;
+    bfdev_allocpool_init(&cache->pool, retval, XDBD_PAGE_SIZE);
+    bfdev_slist_add(&pool->cache, &cache->list);
+
+    retval = bfdev_allocpool_alloc(&cache->pool, size, 0);
+    BFDEV_BUG_ON(!retval);
+
+    return retval;
 }
 
-void *xdbd_palloc(xdbd_pool_t *pool, unsigned size) {
-    xdbd_pool_node_t *node = NULL;
-    node = bfdev_malloc(NULL, sizeof(xdbd_pool_node_t));
-    if (node == NULL) {
+static inline void *
+block_alloc(xdbd_pool_t *pool, size_t size)
+{
+    xdbd_block_t *block;
+    void *retval;
+
+    bfdev_align_high_adj(size, XDBD_PAGE_SIZE);
+
+    block = bfdev_malloc(NULL, sizeof(*block));
+    if (bfdev_unlikely(!block))
         return NULL;
-    }
 
-    node->buf = bfdev_zalloc(NULL, size);
-    if (node->buf == NULL) {
-        bfdev_free(NULL, node);
+    retval = bfdev_malloc(NULL, size);
+    if (bfdev_unlikely(!retval))
         return NULL;
-    }
 
-    bfdev_list_add(&pool->head, &node->list);
-    return node->buf;
+    block->data = retval;
+    bfdev_slist_add(&pool->block, &block->list);
+
+    return retval;
 }
 
-void xdbd_destroy_pool(xdbd_pool_t *pool) {
+void *
+xdbd_palloc(xdbd_pool_t *pool, size_t size)
+{
+    if (size < XDBD_PAGE_SIZE)
+        return cache_alloc(pool, size);
+
+    return block_alloc(pool, size);
+}
+
+xdbd_pool_t *
+xdbd_create_pool()
+{
+    xdbd_pool_t *pool;
+
+    pool = bfdev_malloc(NULL, sizeof(*pool));
+    if (bfdev_unlikely(!pool))
+        return NULL;
+
+    bfdev_slist_head_init(&pool->cache);
+    bfdev_slist_head_init(&pool->block);
+
+    return pool;
+}
+
+void
+xdbd_release_pool(xdbd_pool_t *pool)
+{
+    xdbd_cache_t *cache, *tcache;
+    xdbd_block_t *block, *tblock;
+
+    bfdev_slist_for_each_entry_safe(cache, tcache, &pool->cache, list) {
+        bfdev_free(NULL, cache->data);
+        bfdev_free(NULL, cache);
+    }
+
+    bfdev_slist_for_each_entry_safe(block, tblock, &pool->block, list) {
+        bfdev_free(NULL, block->data);
+        bfdev_free(NULL, block);
+    }
+
+    bfdev_slist_head_init(&pool->cache);
+    bfdev_slist_head_init(&pool->block);
+}
 
-    //FIXME:
-    return;
+void
+xdbd_destroy_pool(xdbd_pool_t *pool)
+{
+    xdbd_release_pool(pool);
+    bfdev_free(NULL, pool);
 }
diff --git a/src/core/xdbd_pool.h b/src/core/xdbd_pool.h
index b3c93aa..83e922e 100644
--- a/src/core/xdbd_pool.h
+++ b/src/core/xdbd_pool.h
@@ -1,19 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright(c) 2024 John Sanpe <sanpeqf@gmail.com>
+ */
+
 #ifndef __XDBD_POOL__H__
 #define __XDBD_POOL__H__
 
-#include <bfdev/list.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <bfdev/allocator.h>
+#include <bfdev/allocpool.h>
+#include <bfdev/slist.h>
+
+#ifndef XDBD_PAGE_SIZE
+# define XDBD_PAGE_SIZE 4096
+#endif
+
+#ifndef XDBD_ALIGN_SIZE
+# define XDBD_ALIGN_SIZE BFDEV_BYTES_PER_LONG
+#endif
+
+typedef struct xdbd_pool xdbd_pool_t;
+typedef struct xdbd_cache xdbd_cache_t;
+typedef struct xdbd_block xdbd_block_t;
+
+struct xdbd_pool {
+    bfdev_slist_head_t cache;
+    bfdev_slist_head_t block;
+};
+
+struct xdbd_cache {
+    bfdev_slist_head_t list;
+    bfdev_allocpool_t pool;
+    void *data;
+};
+
+struct xdbd_block {
+    bfdev_slist_head_t list;
+    void *data;
+};
+
+extern __bfdev_malloc void *
+xdbd_palloc(xdbd_pool_t *pool, size_t size);
 
-typedef struct {
-    void *buf;
-    bfdev_list_head_t list;
-} xdbd_pool_node_t;
+extern xdbd_pool_t *
+xdbd_create_pool();
 
-typedef struct {
-    bfdev_list_head_t head;
-} xdbd_pool_t;
+extern void
+xdbd_release_pool(xdbd_pool_t *pool);
 
-xdbd_pool_t *xdbd_create_pool();
-void *xdbd_palloc(xdbd_pool_t *pool, unsigned size);
-void xdbd_destroy_pool(xdbd_pool_t *pool);
+extern void
+xdbd_destroy_pool(xdbd_pool_t *pool);
 
 #endif  /*__XDBD_POOL__H__*/