藍色表示空閑的頁面,白色表示已經被分配的頁面,可以看到如上內存域的空閑頁面(藍色)非常零散,無法分配大于兩頁的連續物理內存。
下面演示一下內存規整的簡化工作原理,內核會運行兩個獨立的掃描動作:第一個掃描從內存域的底部開始,一邊掃描一邊將已分配的可移動(MOVABLE)頁面記錄到一個列表中:
另外第二掃描是從內存域的頂部開始,掃描可以作為頁面遷移目標的空閑頁面位置,然后也記錄到一個列表里面:
等兩個掃描在域中間相遇,意味著掃描結束,然后將左邊掃描得到的已分配的頁面遷移到右邊空閑的頁面中,左邊就形成了一段連續的物理內存,完成頁面規整。
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