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                ### 寫時復制(Copy On Write) 一般我們運行程序都是Fork一個進程后馬上執行Exec加載程序,而Fork的是否實際上用的是父進程的堆棧空間,Linux通過Copy On Write技術極大地減少了Fork的開銷。 Copy On Write的含義是只有真正寫的時候才把數據寫到子進程的數據,Fork時只會把頁表復制到子進程,這樣父子進程都指向同一個物理內存頁,只有再寫子進程的時候才會把內存頁的內容重新復制一份。
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