From b76a66aa72f2e2b1704fe6dd03a7b4bb4b532af9 Mon Sep 17 00:00:00 2001
From: chyyuu <chyyuu@k750s>
Date: Thu, 17 Oct 2013 09:28:22 +0800
Subject: [PATCH] update hw2,3

---
 homework/hw2.txt | 8 ++++++++
 homework/hw3.txt | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/homework/hw2.txt b/homework/hw2.txt
index 333a167..bd4aec4 100644
--- a/homework/hw2.txt
+++ b/homework/hw2.txt
@@ -55,6 +55,11 @@ c. What is the minimumnumber of page faults for an optimal page-
 replacement strategy for the reference string in part b with four
 page frames?
 
+1. 请证明LRU算法不会存在belady现象。
+
+2. 请证明或详细说明FIFO/CLOCK/Enhanced CLOCK是否有belady现象？
+
+
 实验相关
 ------------------
 
@@ -78,3 +83,6 @@ IF before clock sweep: (used,dirty) = (1,1), THEN after clock sweep: (used, dirt
 
 8 如果在ucore中实现精确的LRU算法，如何设计？需要硬件和OS分别完成什么事情？
 
+9 如果在ucore中实现工作集页替换算法和缺页频率替换算法，如何设计？
+
+
diff --git a/homework/hw3.txt b/homework/hw3.txt
index f530127..d3512a0 100644
--- a/homework/hw3.txt
+++ b/homework/hw3.txt
@@ -7,4 +7,6 @@
 6. 父进程与子进程之间在内容上有何差异？在执行上有何差异？
 7. 父进程fork完子进程后，这两个进程在执行的过程中是否有先后顺序？
 8. 进程/线程上下文切换的执行逻辑是什么？二者有无区别？如有，区别是啥？
+9. 为何vfork机制在有了Copy on Write (简称COW)技术后意义变得不大了？
+10. 如何在ucore中实现COW技术？