[虛擬化; VM; VMM ;Vmemory #補Container](https://alvislu01.notion.site/VM-VMM-Vmemory-Container-69d28042a3e04420acd9e2534fe40e04)
Virtual Memory
Copy on Write ( COW ) # 用於 Fork system call
優缺點
VM軟體
技術:Demand Paging = Paging + lazy swapper / Valid Invalid Bit
Page Fault
EMAT求算
降低 Page Fault Ratio 方法 👇🏼EMAT中的P
1️⃣Page Replacement Algo選擇
Page Replacement Algo ⭐
Belady Anomaly ⚠️
2️⃣ Frame 數目分配多寡 ( 硬體決定 )
3️⃣Page Size ⭐⭐⭐
4️⃣Program Structure : array; loop
Thrashing⚠️及防範方法:Page Fault Frequency & Working set mode