diff --git a/study/kernel/02-memory/04-buddy/04-alloc_page/README.md b/study/kernel/02-memory/04-buddy/04-alloc_page/README.md
index 183f075..fa6e81d 100755
--- a/study/kernel/02-memory/04-buddy/04-alloc_page/README.md
+++ b/study/kernel/02-memory/04-buddy/04-alloc_page/README.md
@@ -945,12 +945,50 @@ static struct page *__rmqueue_pcplist(struct zone *zone, int migratetype,
 }
 ```
 
-### 3.4.3   ` __rmqueue`
+*   如果 PCP list 是空的, 那么会通过 [`rmqueue_bulk`](https://elixir.bootlin.com/linux/v5.10/source/mm/page_alloc.c#L2880) 从 buddy 伙伴系统分配 pcp->batch 个页面出来.
+
+*   否则, PCP 中有页面, 则直接取一个页面出来.
+
+### 3.4.3   ` __rmqueue_smallest`
 -------
 
 
-### 3.4.4   `__rmqueue_smallest`
+`__rmqueue` 主体是通过 `__rmqueue_smallest` 来向 buddy 伙伴系统中像切蛋糕一样, 切出一块内存出来的.
+
+```cpp
+// https://elixir.bootlin.com/linux/v5.10/source/mm/page_alloc.c#L2303
+/*
+ * Go through the free lists for the given migratetype and remove
+ * the smallest available page from the freelists
+ */
+static __always_inline
+struct page *__rmqueue_smallest(struct zone *zone, unsigned int order,
+                        int migratetype)
+{
+    unsigned int current_order;
+    struct free_area *area;
+    struct page *page;
+
+    /* Find a page of the appropriate size in the preferred list */
+    for (current_order = order; current_order < MAX_ORDER; ++current_order) {
+        area = &(zone->free_area[current_order]);
+        page = get_page_from_free_area(area, migratetype);
+        if (!page)
+            continue;
+        del_page_from_free_list(page, zone, current_order);
+        expand(zone, page, order, current_order, migratetype);
+        set_pcppage_migratetype(page, migratetype);
+        return page;
+    }
+
+    return NULL;
+}
+```
+
+
+![`__rmqueue_fallback` 流程](./__rmqueue_fallback.png)
+
+### 3.4.4 `__rmqueue_fallback`
 -------
 
-
-### 3.4.5 __rmqueue_fallback
\ No newline at end of file
+如果前面的流程都分配失败了, 那么说明当前 ZONG 区域指定 MIGRATE_TYPE 中没有足够的空闲页来完成本次分配了. 那么内核此时将尝试
\ No newline at end of file
diff --git a/study/kernel/02-memory/04-buddy/04-alloc_page/__rmqueue_fallback.png b/study/kernel/02-memory/04-buddy/04-alloc_page/__rmqueue_fallback.png
new file mode 100755
index 0000000..7d1cd53
Binary files /dev/null and b/study/kernel/02-memory/04-buddy/04-alloc_page/__rmqueue_fallback.png differ
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new file mode 100755
index 0000000..57b9a5c
--- /dev/null
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+      "seed": 1256279539,
+      "version": 88,
+      "versionNonce": 542039133,
+      "isDeleted": false,
+      "boundElementIds": null,
+      "text": "for (current_order = order; current_order < MAX_ORDER; ++current_order)",
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+      "fontFamily": 1,
+      "textAlign": "left",
+      "verticalAlign": "top",
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+      "strokeColor": "#000000",
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+      "seed": 741539123,
+      "version": 134,
+      "versionNonce": 840519699,
+      "isDeleted": false,
+      "boundElementIds": null,
+      "text": "取出当前 current_order 对应 migrate_type 的第一个页面",
+      "fontSize": 16,
+      "fontFamily": 1,
+      "textAlign": "left",
+      "verticalAlign": "top",
+      "baseline": 17
+    },
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+      "type": "arrow",
+      "x": 537,
+      "y": -125,
+      "width": 95,
+      "height": 0,
+      "angle": 0,
+      "strokeColor": "#000000",
+      "backgroundColor": "#fab005",
+      "fillStyle": "hachure",
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+      "versionNonce": 1778537875,
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+      "endArrowhead": "arrow"
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+      "y": -169.5,
+      "width": 244,
+      "height": 23,
+      "angle": 0,
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+      "fillStyle": "hachure",
+      "strokeWidth": 1,
+      "strokeStyle": "solid",
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+      "opacity": 100,
+      "groupIds": [],
+      "strokeSharpness": "sharp",
+      "seed": 1155363859,
+      "version": 179,
+      "versionNonce": 129555133,
+      "isDeleted": false,
+      "boundElementIds": null,
+      "text": "将取出的页面从 free_area 中移除",
+      "fontSize": 16,
+      "fontFamily": 1,
+      "textAlign": "left",
+      "verticalAlign": "top",
+      "baseline": 17
+    },
+    {
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+      "version": 1288,
+      "versionNonce": 1284303379,
+      "isDeleted": false,
+      "id": "dlNnMK5bKtj4P5dMwnfo6",
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+      "strokeStyle": "solid",
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+      "opacity": 100,
+      "angle": 0,
+      "x": 641,
+      "y": -17.5,
+      "strokeColor": "#000000",
+      "backgroundColor": "#82c91e",
+      "width": 558,
+      "height": 23,
+      "seed": 1065684861,
+      "groupIds": [],
+      "strokeSharpness": "sharp",
+      "boundElementIds": [],
+      "fontSize": 16,
+      "fontFamily": 1,
+      "text": "fallback 情况下，会从其他 migrate_type 窃取的内存，migrate_type 要设置",
+      "baseline": 17,
+      "textAlign": "center",
+      "verticalAlign": "top"
+    },
+    {
+      "id": "D7MDS4Pm1KTO2tvR1_tVP",
+      "type": "line",
+      "x": 534,
+      "y": -268,
+      "width": 12,
+      "height": 299,
+      "angle": 0,
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+      "versionNonce": 89117043,
+      "isDeleted": false,
+      "boundElementIds": null,
+      "points": [
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+        ],
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+          299
+        ]
+      ],
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+      "startBinding": null,
+      "endBinding": null,
+      "startArrowhead": null,
+      "endArrowhead": null
+    },
+    {
+      "id": "go0z08x204Flj3kcsqo3C",
+      "type": "arrow",
+      "x": 505,
+      "y": -365,
+      "width": 32,
+      "height": 81,
+      "angle": 0,
+      "strokeColor": "#000000",
+      "backgroundColor": "#fab005",
+      "fillStyle": "hachure",
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+      "isDeleted": false,
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+      "points": [
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+      },
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+      "startArrowhead": null,
+      "endArrowhead": "arrow"
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+  ],
+  "appState": {
+    "gridSize": null,
+    "viewBackgroundColor": "#ffffff"
+  }
+}
\ No newline at end of file