--- a/slide.md	Sat Jun 22 12:32:52 2019 +0900
+++ b/slide.md	Mon Jun 24 13:05:55 2019 +0900
@@ -1,32 +1,32 @@
 title: Studying Operating System Using Docker Platform  
 author: Shivani Dubey
-profile: Madan Mohan Malaviiya, University of Technology
+profile: Madan Mohan Malaviya University of Technology, Gorakhpur
 
-## Why we study Operating System?
+## Why do we study Operating System?
 
-- Every computer system has an operating system, which manages the resource of the computer.
+- Every computer system has an operating system, which manages the resources of the computer.
 
-- IoT or IT Services can't work well without resource manageents.
+- IoT or IT Services can't work well without resource managements.
 
-- To handle it, we have to understand the API of OS
+- To handle it, we have to understand the API of OS.
 
-- To understand the API, it it better to see the implentations.
+- To understand the API, it is better to see the implementations.
 
-- For an example, API for tuning priorities of the processess
+- For example, API for tuning priorities of the processes.
 
 ## Xv6 Operating System as an educational tool
 
-- A Unix-like operating system developed in MIT, based on V6 kernel.
+- A Unix-like operating system developed in MIT, based on V6 kernel
 
-- xv6 is written in ANSI C ( not in C++ ).
+- xv6 is written in ANSI C ( not in C++ )
 
 - xv6 is small and simple (9628 lines of codes)
 
-- It can run on Respberry Pi ( Small PC board )
+- It can run on Raspberry Pi ( Small PC board )
 
 - Or on ARM emulator such as QEMU
 
-## Xv6 development envrionment with QEMU
+## Xv6 development environment with QEMU
 
 - QEMU emulates ARM CPU with virtual memory 
 
@@ -34,14 +34,13 @@
 
 - gdb debugger can be attached to the emulated program (both in user space and system space)
 
-- We can step and trace the internal of xv6 kernel
+- We can step and trace inside xv6 kernel
 
-      ... but it requires complex development envrionments setup
+      ... but it requires complex development environments setup
       ... very time consuming
 
-## Our development envrionments 
+## Our development environments 
 
-- emacs editor (amidst the editor war between vi and emacs!)
 
 - homebrew (it simplifies installation of software in macOS)
 
@@ -57,13 +56,13 @@
 
 - What is Docker? It is a container.
 
-- What is Container? An isolateed envriornment such as file system.
+- What is Container? An isolated envirornment such as file system.
 
-- It has DockerFile, which describes how to setup the envrionment in the container
+- It has DockerFile, which describes how to setup the envrionment in the container.
 
-- Docker can run on any computer using an emulator such as QEMU
+- Docker can run on any computer using an emulator such as QEMU.
 
-- Complex develement environment can be build using DockerFile and docker built command.
+- Complex development environment can be build using DockerFile and docker built command.
 
 # The DockerFile
 
@@ -78,51 +77,41 @@
 CMD /bin/bash
 ```
 
-- FROM lines specifies the shared image in Docker repository.
+- FROM line specifies the shared image in Docker repository.
 
-- apt-get install Linux cross compiling tools
+- apt-get installs Linux cross compiling tools.
 
-- then it create workig directory, and copy our sources to it, and execute make
+- Then it creates working directory, copies our sources to it, and executes make.
 
-## Docker command
+## Docker commands
 
-- create docker imagae and environment, and built xv6 kernel
+- Create docker image and environment, and build xv6 kernel
 
-  docker build --tag xv6-docker .
+  docker build --tag xv6-docker 
 
-- run xv6 kernel on QEMU in the container
+- Run xv6 kernel on QEMU in the container
 
   docker run --rm --privileged -it xv6-docker ./run-debug.sh
 
-- run gdb to connect the xv6 kernel running in the QEMU
+- Run gdb to connect the xv6 kernel running in the QEMU
 
   docker exec -it xv6-docker ./debug.sh
 
-## Features of Docker:
 
-- Easy and Faster Configuration
-
-- Increases productivity
-
-- Application Isolation
-
-- Provies Services
-
-- Security Management
 
 
-# Exercise : adding priorities to the xv6 scheduler 
+
+# Exercise : Adding priorities to the xv6 scheduler 
 
 - Added getpriority() and setpriority() 
 
 - get_highest_priority() functions in proc.c file of xv6
 
-- implement it in schelduler()
+- Implemented it in schelduler()
 
 - Added a test function testpriority() in usertests.c file of xv6 to implement our algorithm
 
-##  The function 
-
+##  Function used in our exercise to find highest priority process 
 ```c
 int get_highest_priority_proc(void)
 {
@@ -130,24 +119,20 @@
   int pid = 0;
   int hpid = -1;
   int rpid = 0;
-
   highest_priority=100;
-  struct proc *p;
+ 
+ struct proc *p;
   for(p = ptable.proc; p < &ptable.proc[NPROC]; p++, pid++){
     if(p->state != RUNNABLE) {
-      continue;
-    }
+      continue;    }
     rpid = pid;
     if (highest_priority > p->priority) {
        highest_priority=p->priority;
-       hpid = pid;
-    }
-  }
+       hpid = pid; } }
   return hpid > 0?hpid:rpid;
 }
 ```
-
-- It assumes at least one process is RUNNABLE
+- It assumes at least one process to be RUNNABLE.
 
 - It may allow no highest priority process.
 
@@ -155,13 +140,14 @@
 
 ## Docker Limitation
 
-- If repository breaks, Docker poses a problem (a cloud probelm)
 
-- Clound should be used conviniently but don't rely on it.
+- If repository breaks, Docker poses a problem (a cloud problem).
+
+- Cloud may be used conveniently but we must not rely on it.
 
 - We can use a direct environment without Docker, since we have a Linux server.
 
-- Docker images can easily eats up our disk spaces.
+- Docker images can easily eat up our disk spaces.
 
 in ~/.zsh_history
 
@@ -173,8 +159,9 @@
 ```
 # Conclusion
 
-- Docker environment poses some problems, some of which are difficult to comprehend 
+
+- Docker environment poses some problems, some of which are difficult to comprehend. 
 
-- Storage is difficult too
+
 
-- Yet, it gives a good insight of the underlying important concepts of operating system beacuse it is well documented, fast and uses less resources
+- Yet, it gives a good insight of the underlying important concepts of operating system because it is well documented, fast and uses less resources.