Mercurial > hg > Members > shivanidubey > Internship_presentation
changeset 3:623da64aac7a default tip
Internship_presentation
| author | shivanidubey |
|---|---|
| date | Mon, 24 Jun 2019 13:05:55 +0900 |
| parents | 54dd75a92d04 |
| children | |
| files | slide.html slide.md slide.md~ slide.pdf.html |
| diffstat | 4 files changed, 428 insertions(+), 220 deletions(-) [+] |
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--- a/slide.html Sat Jun 22 12:32:52 2019 +0900 +++ b/slide.html Mon Jun 24 13:05:55 2019 +0900 @@ -78,7 +78,7 @@ <td> <div align="left"> Shivani Dubey - Intern, University of the Ryukyus + Madan Mohan Malaviya University of Technology, Gorakhpur <hr style="color:#ffcc00;background-color:#ffcc00;text-align:left;border:none;width:100%;height:0.2em;"> </div> </td> @@ -91,14 +91,23 @@ <div class='slide'> <!-- _S9SLIDE_ --> -<h1 id="why-operating-system">Why Operating System?</h1> +<h2 id="why-do-we-study-operating-system">Why do we study Operating System?</h2> <ul> <li> - <p>Backbone of computer system</p> + <p>Every computer system has an operating system, which manages the resources of the computer.</p> + </li> + <li> + <p>IoT or IT Services can’t work well without resource managements.</p> </li> <li> - <p>Manages the computer’s memory and processes, as well as all of its software and hardware.</p> + <p>To handle it, we have to understand the API of OS.</p> + </li> + <li> + <p>To understand the API, it is better to see the implementations.</p> + </li> + <li> + <p>For example, API for tuning priorities of the processes.</p> </li> </ul> @@ -108,33 +117,50 @@ <div class='slide'> <!-- _S9SLIDE_ --> -<h1 id="introduction">Introduction</h1> +<h2 id="xv6-operating-system-as-an-educational-tool">Xv6 Operating System as an educational tool</h2> <ul> <li> - <p>Docker</p> + <p>A Unix-like operating system developed in MIT, based on V6 kernel</p> + </li> + <li> + <p>xv6 is written in ANSI C ( not in C++ )</p> </li> <li> - <p>xv6</p> + <p>xv6 is small and simple (9628 lines of codes)</p> + </li> + <li> + <p>It can run on Raspberry Pi ( Small PC board )</p> + </li> + <li> + <p>Or on ARM emulator such as QEMU</p> </li> </ul> -<p>What is Docker?</p> + + +</div> -<ul> - <li>The modern platform for high velocity innovation</li> - <li>Docker has products that use operating system level virtualization to develop and deliver software in packages called containers</li> - <li>Docker can run on any computer, on any infrastructure and in any cloud</li> -</ul> - -<p>What is xv6?</p> +<div class='slide'> + <!-- _S9SLIDE_ --> +<h2 id="xv6-development-environment-with-qemu">Xv6 development environment with QEMU</h2> <ul> <li> - <p>A Unix-like operating system developed in MIT.</p> + <p>QEMU emulates ARM CPU with virtual memory</p> + </li> + <li> + <p>Xv6 operating sytem itself is running on QEMU</p> </li> <li> - <p>xv6 is modern reimplementation of Sixth Edition Unix in ANSI C.</p> + <p>gdb debugger can be attached to the emulated program (both in user space and system space)</p> + </li> + <li> + <p>We can step and trace inside xv6 kernel</p> + + <pre><code>... but it requires complex development environments setup +... very time consuming +</code></pre> </li> </ul> @@ -144,18 +170,50 @@ <div class='slide'> <!-- _S9SLIDE_ --> -<h1 id="what-helped-us">What helped us</h1> +<h2 id="our-development-environments">Our development environments</h2> <ul> <li> - <p>emacs editor (amidst the editor war between vi and emacs!)</p> - </li> - <li> <p>homebrew (it simplifies installation of software in macOS)</p> </li> <li> <p>Mercurial repository of the lab where we saved everything using ssh</p> </li> + <li> + <p>Cross Compilers</p> + </li> + <li> + <p>ARM libraries for C language</p> + </li> + <li> + <p>QEMU (ARM Emulator)</p> + </li> +</ul> + + + +</div> + +<div class='slide'> + <!-- _S9SLIDE_ --> +<h2 id="introducing-docker">Introducing Docker</h2> + +<ul> + <li> + <p>What is Docker? It is a container.</p> + </li> + <li> + <p>What is Container? An isolated envirornment such as file system.</p> + </li> + <li> + <p>It has DockerFile, which describes how to setup the envrionment in the container.</p> + </li> + <li> + <p>Docker can run on any computer using an emulator such as QEMU.</p> + </li> + <li> + <p>Complex development environment can be build using DockerFile and docker built command.</p> + </li> </ul> @@ -164,25 +222,27 @@ <div class='slide'> <!-- _S9SLIDE_ --> -<h2 id="why-docker">Why Docker?</h2> +<h1 id="the-dockerfile">The DockerFile</h1> -<p>Features of Docker:</p> +<pre><code>FROM phitek/qemu-arm +RUN apt-get update -y +RUN apt-get remove gdb -y +RUN apt-get install gcc-arm-none-eabi gdb-arm-none-eabi qemu-system-arm -y +WORKDIR /code +COPY ["src", "."] +RUN make +CMD /bin/bash +</code></pre> <ul> <li> - <p>Easy and Faster Configuration</p> - </li> - <li> - <p>Increases productivity</p> + <p>FROM line specifies the shared image in Docker repository.</p> </li> <li> - <p>Application Isolation</p> + <p>apt-get installs Linux cross compiling tools.</p> </li> <li> - <p>Services</p> - </li> - <li> - <p>Security Management</p> + <p>Then it creates working directory, copies our sources to it, and executes make.</p> </li> </ul> @@ -192,14 +252,23 @@ <div class='slide'> <!-- _S9SLIDE_ --> -<h2 id="why-xv6">Why xv6?</h2> +<h2 id="docker-commands">Docker commands</h2> <ul> <li> - <p>It gives a good insight into Command Line Interface of Unix OS</p> + <p>Create docker image and environment, and build xv6 kernel</p> + + <p>docker build –tag xv6-docker</p> </li> <li> - <p>xv6 is modern reimplementation of Sixth Edition Unix in ANSI C</p> + <p>Run xv6 kernel on QEMU in the container</p> + + <p>docker run –rm –privileged -it xv6-docker ./run-debug.sh</p> + </li> + <li> + <p>Run gdb to connect the xv6 kernel running in the QEMU</p> + + <p>docker exec -it xv6-docker ./debug.sh</p> </li> </ul> @@ -209,11 +278,17 @@ <div class='slide'> <!-- _S9SLIDE_ --> -<h1 id="scheduling-processes-by-their-priorities">Scheduling processes by their priorities</h1> +<h1 id="exercise--adding-priorities-to-the-xv6-scheduler">Exercise : Adding priorities to the xv6 scheduler</h1> <ul> <li> - <p>Added getpriority() and setpriority() and get_highest_priority() functions in proc.c file of xv6</p> + <p>Added getpriority() and setpriority()</p> + </li> + <li> + <p>get_highest_priority() functions in proc.c file of xv6</p> + </li> + <li> + <p>Implemented it in schelduler()</p> </li> <li> <p>Added a test function testpriority() in usertests.c file of xv6 to implement our algorithm</p> @@ -226,30 +301,37 @@ <div class='slide'> <!-- _S9SLIDE_ --> -<h2 id="the-function">The function</h2> - +<h2 id="function-used-in-our-exercise-to-find-highest-priority-process">Function used in our exercise to find highest priority process</h2> <pre><code class="language-c">int get_highest_priority_proc(void) { int highest_priority; 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; } </code></pre> +<ul> + <li> + <p>It assumes at least one process to be RUNNABLE.</p> + </li> + <li> + <p>It may allow no highest priority process.</p> + </li> + <li> + <p>The correctness of the function is <em>important</em>.</p> + </li> +</ul> @@ -259,14 +341,28 @@ <!-- _S9SLIDE_ --> <h2 id="docker-limitation">Docker Limitation</h2> -<p>Mutliple images present in repository due to form command.</p> - -<p>If repository breaks, Docker poses problem</p> +<ul> + <li> + <p>If repository breaks, Docker poses a problem (a cloud problem).</p> + </li> + <li> + <p>Cloud may be used conveniently but we must not rely on it.</p> + </li> + <li> + <p>We can use a direct environment without Docker, since we have a Linux server.</p> + </li> + <li> + <p>Docker images can easily eat up our disk spaces.</p> + </li> +</ul> -<p>What can be done?</p> +<p>in ~/.zsh_history</p> -<p>We can keep track of images of Docker</p> - +<pre><code class="language-c">: 1561014922:0;docker system prune +: 1561014973:0;docker container prune +: 1561015350:0;docker image prune +: 1561015362:0;docker volume prune +</code></pre> </div> @@ -277,13 +373,10 @@ <ul> <li> - <p>Docker environment poses some problems, some of which are difficult to comprehend</p> + <p>Docker environment poses some problems, some of which are difficult to comprehend.</p> </li> <li> - <p>Storage is difficult too</p> - </li> - <li> - <p>Yet, it gives a good insight of the underlying important concepts of operating system beacuse it is well documented, fast and uses less resources</p> + <p>Yet, it gives a good insight of the underlying important concepts of operating system because it is well documented, fast and uses less resources.</p> </li> </ul>
--- 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.
--- a/slide.md~ Sat Jun 22 12:32:52 2019 +0900 +++ b/slide.md~ Mon Jun 24 13:05:55 2019 +0900 @@ -1,89 +1,117 @@ title: Studying Operating System Using Docker Platform author: Shivani Dubey -profile: Intern, University of the Ryukyus +profile: Madan Mohan Malaviya University of Technology, Gorakhpur -# Why Operating System? +## Why do we study Operating System? -- Backbone of computer system +- Every computer system has an operating system, which manages the resources of the computer. -- Manages the computer's memory and processes, as well as all of its software and hardware. +- IoT or IT Services can't work well without resource managements. +- To handle it, we have to understand the API of OS. -# Introduction +- To understand the API, it is better to see the implementations. - -- Docker +- For example, API for tuning priorities of the processes. -- xv6 +## Xv6 Operating System as an educational tool -What is Docker? +- A Unix-like operating system developed in MIT, based on V6 kernel +- xv6 is written in ANSI C ( not in C++ ) -- The modern platform for high velocity innovation. -- Docker has products that use operating system level virtualization to develop and deliver software in packages called containers. -- Docker can run on any computer, on any infrastructure and in any cloud. +- xv6 is small and simple (9628 lines of codes) + +- It can run on Raspberry Pi ( Small PC board ) +- Or on ARM emulator such as QEMU -What is xv6? +## Xv6 development environment with QEMU +- QEMU emulates ARM CPU with virtual memory -- A Unix-like operating system developed in MIT. +- Xv6 operating sytem itself is running on QEMU -- xv6 is modern reimplementation of Sixth Edition Unix in ANSI C. +- gdb debugger can be attached to the emulated program (both in user space and system space) +- We can step and trace inside xv6 kernel -# What helped us - + ... but it requires complex development environments setup + ... very time consuming +## Our development environments -- emacs editor (amidst the editor war between vi and emacs!) - homebrew (it simplifies installation of software in macOS) - Mercurial repository of the lab where we saved everything using ssh +- Cross Compilers -## Why Docker? +- ARM libraries for C language - +- QEMU (ARM Emulator) -Features of Docker: +## Introducing Docker + +- What is Docker? It is a container. +- What is Container? An isolated envirornment such as file system. -- Easy and Faster Configuration +- It has DockerFile, which describes how to setup the envrionment in the container. -- Increases productivity +- Docker can run on any computer using an emulator such as QEMU. -- Application Isolation +- Complex development environment can be build using DockerFile and docker built command. + +# The DockerFile -- Services - -- Security Management +``` +FROM phitek/qemu-arm +RUN apt-get update -y +RUN apt-get remove gdb -y +RUN apt-get install gcc-arm-none-eabi gdb-arm-none-eabi qemu-system-arm -y +WORKDIR /code +COPY ["src", "."] +RUN make +CMD /bin/bash +``` +- FROM line specifies the shared image in Docker repository. -## Why xv6? - +- apt-get installs Linux cross compiling tools. +- Then it creates working directory, copies our sources to it, and executes make. -- It gives a good insight into Command Line Interface of Unix OS. +## Docker commands + +- Create docker image and environment, and build xv6 kernel + + docker build --tag xv6-docker -- xv6 is modern reimplementation of Sixth Edition Unix in ANSI C. +- 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 -# Scheduling processes by their priorities + docker exec -it xv6-docker ./debug.sh -- Added getpriority() and setpriority() and get_highest_priority() functions in proc.c file of xv6 + +# Exercise : Adding priorities to the xv6 scheduler - +- Added getpriority() and setpriority() + +- get_highest_priority() functions in proc.c file of xv6 + +- 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) { @@ -101,34 +129,41 @@ 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 to be RUNNABLE. +- It may allow no highest priority process. + +- The correctness of the function is *important*. ## Docker Limitation - -Mutliple images present in repository due to form command. + +- If repository breaks, Docker poses a problem (a cloud problem). -If repository breaks, Docker poses 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 eat up our disk spaces. -What can be done? - +in ~/.zsh_history -We can keep track of images of Docker. +```c +: 1561014922:0;docker system prune +: 1561014973:0;docker container prune +: 1561015350:0;docker image prune +: 1561015362:0;docker volume prune +``` +# Conclusion -# Conclusion - - Docker environment poses some problems, some of which are difficult to comprehend. -- Storage is difficult - -- Yet, it gives a good insight of the underlying important concepts of operating system beacuse it is well documented, fast and uses less resources. \ No newline at end of file +- Yet, it gives a good insight of the underlying important concepts of operating system because it is well documented, fast and uses less resources.
--- a/slide.pdf.html Sat Jun 22 12:32:52 2019 +0900 +++ b/slide.pdf.html Mon Jun 24 13:05:55 2019 +0900 @@ -63,7 +63,7 @@ <td> <div align="left"> Shivani Dubey - Intern, University of the Ryukyus + Madan Mohan Malaviya University of Technology, Gorakhpur <hr style="color:#ffcc00;background-color:#ffcc00;text-align:left;border:none;width:100%;height:0.2em;"> </div> </td> @@ -75,14 +75,23 @@ <div class='slide'> <!-- _S9SLIDE_ --> -<h1 id="why-operating-system">Why Operating System?</h1> +<h2 id="why-do-we-study-operating-system">Why do we study Operating System?</h2> <ul> <li> - <p>Backbone of computer system</p> + <p>Every computer system has an operating system, which manages the resources of the computer.</p> + </li> + <li> + <p>IoT or IT Services can’t work well without resource managements.</p> </li> <li> - <p>Manages the computer’s memory and processes, as well as all of its software and hardware.</p> + <p>To handle it, we have to understand the API of OS.</p> + </li> + <li> + <p>To understand the API, it is better to see the implementations.</p> + </li> + <li> + <p>For example, API for tuning priorities of the processes.</p> </li> </ul> @@ -92,33 +101,50 @@ <div class='slide'> <!-- _S9SLIDE_ --> -<h1 id="introduction">Introduction</h1> +<h2 id="xv6-operating-system-as-an-educational-tool">Xv6 Operating System as an educational tool</h2> <ul> <li> - <p>Docker</p> + <p>A Unix-like operating system developed in MIT, based on V6 kernel</p> + </li> + <li> + <p>xv6 is written in ANSI C ( not in C++ )</p> </li> <li> - <p>xv6</p> + <p>xv6 is small and simple (9628 lines of codes)</p> + </li> + <li> + <p>It can run on Raspberry Pi ( Small PC board )</p> + </li> + <li> + <p>Or on ARM emulator such as QEMU</p> </li> </ul> -<p>What is Docker?</p> + + +</div> -<ul> - <li>The modern platform for high velocity innovation</li> - <li>Docker has products that use operating system level virtualization to develop and deliver software in packages called containers</li> - <li>Docker can run on any computer, on any infrastructure and in any cloud</li> -</ul> - -<p>What is xv6?</p> +<div class='slide'> + <!-- _S9SLIDE_ --> +<h2 id="xv6-development-environment-with-qemu">Xv6 development environment with QEMU</h2> <ul> <li> - <p>A Unix-like operating system developed in MIT.</p> + <p>QEMU emulates ARM CPU with virtual memory</p> + </li> + <li> + <p>Xv6 operating sytem itself is running on QEMU</p> </li> <li> - <p>xv6 is modern reimplementation of Sixth Edition Unix in ANSI C.</p> + <p>gdb debugger can be attached to the emulated program (both in user space and system space)</p> + </li> + <li> + <p>We can step and trace inside xv6 kernel</p> + + <pre><code>... but it requires complex development environments setup +... very time consuming +</code></pre> </li> </ul> @@ -128,18 +154,50 @@ <div class='slide'> <!-- _S9SLIDE_ --> -<h1 id="what-helped-us">What helped us</h1> +<h2 id="our-development-environments">Our development environments</h2> <ul> <li> - <p>emacs editor (amidst the editor war between vi and emacs!)</p> - </li> - <li> <p>homebrew (it simplifies installation of software in macOS)</p> </li> <li> <p>Mercurial repository of the lab where we saved everything using ssh</p> </li> + <li> + <p>Cross Compilers</p> + </li> + <li> + <p>ARM libraries for C language</p> + </li> + <li> + <p>QEMU (ARM Emulator)</p> + </li> +</ul> + + + +</div> + +<div class='slide'> + <!-- _S9SLIDE_ --> +<h2 id="introducing-docker">Introducing Docker</h2> + +<ul> + <li> + <p>What is Docker? It is a container.</p> + </li> + <li> + <p>What is Container? An isolated envirornment such as file system.</p> + </li> + <li> + <p>It has DockerFile, which describes how to setup the envrionment in the container.</p> + </li> + <li> + <p>Docker can run on any computer using an emulator such as QEMU.</p> + </li> + <li> + <p>Complex development environment can be build using DockerFile and docker built command.</p> + </li> </ul> @@ -148,25 +206,27 @@ <div class='slide'> <!-- _S9SLIDE_ --> -<h2 id="why-docker">Why Docker?</h2> +<h1 id="the-dockerfile">The DockerFile</h1> -<p>Features of Docker:</p> +<pre><code>FROM phitek/qemu-arm +RUN apt-get update -y +RUN apt-get remove gdb -y +RUN apt-get install gcc-arm-none-eabi gdb-arm-none-eabi qemu-system-arm -y +WORKDIR /code +COPY ["src", "."] +RUN make +CMD /bin/bash +</code></pre> <ul> <li> - <p>Easy and Faster Configuration</p> - </li> - <li> - <p>Increases productivity</p> + <p>FROM line specifies the shared image in Docker repository.</p> </li> <li> - <p>Application Isolation</p> + <p>apt-get installs Linux cross compiling tools.</p> </li> <li> - <p>Services</p> - </li> - <li> - <p>Security Management</p> + <p>Then it creates working directory, copies our sources to it, and executes make.</p> </li> </ul> @@ -176,14 +236,23 @@ <div class='slide'> <!-- _S9SLIDE_ --> -<h2 id="why-xv6">Why xv6?</h2> +<h2 id="docker-commands">Docker commands</h2> <ul> <li> - <p>It gives a good insight into Command Line Interface of Unix OS</p> + <p>Create docker image and environment, and build xv6 kernel</p> + + <p>docker build –tag xv6-docker</p> </li> <li> - <p>xv6 is modern reimplementation of Sixth Edition Unix in ANSI C</p> + <p>Run xv6 kernel on QEMU in the container</p> + + <p>docker run –rm –privileged -it xv6-docker ./run-debug.sh</p> + </li> + <li> + <p>Run gdb to connect the xv6 kernel running in the QEMU</p> + + <p>docker exec -it xv6-docker ./debug.sh</p> </li> </ul> @@ -193,11 +262,17 @@ <div class='slide'> <!-- _S9SLIDE_ --> -<h1 id="scheduling-processes-by-their-priorities">Scheduling processes by their priorities</h1> +<h1 id="exercise--adding-priorities-to-the-xv6-scheduler">Exercise : Adding priorities to the xv6 scheduler</h1> <ul> <li> - <p>Added getpriority() and setpriority() and get_highest_priority() functions in proc.c file of xv6</p> + <p>Added getpriority() and setpriority()</p> + </li> + <li> + <p>get_highest_priority() functions in proc.c file of xv6</p> + </li> + <li> + <p>Implemented it in schelduler()</p> </li> <li> <p>Added a test function testpriority() in usertests.c file of xv6 to implement our algorithm</p> @@ -210,30 +285,37 @@ <div class='slide'> <!-- _S9SLIDE_ --> -<h2 id="the-function">The function</h2> - +<h2 id="function-used-in-our-exercise-to-find-highest-priority-process">Function used in our exercise to find highest priority process</h2> <pre><code class="language-c">int get_highest_priority_proc(void) { int highest_priority; 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; } </code></pre> +<ul> + <li> + <p>It assumes at least one process to be RUNNABLE.</p> + </li> + <li> + <p>It may allow no highest priority process.</p> + </li> + <li> + <p>The correctness of the function is <em>important</em>.</p> + </li> +</ul> @@ -243,14 +325,28 @@ <!-- _S9SLIDE_ --> <h2 id="docker-limitation">Docker Limitation</h2> -<p>Mutliple images present in repository due to form command.</p> - -<p>If repository breaks, Docker poses problem</p> +<ul> + <li> + <p>If repository breaks, Docker poses a problem (a cloud problem).</p> + </li> + <li> + <p>Cloud may be used conveniently but we must not rely on it.</p> + </li> + <li> + <p>We can use a direct environment without Docker, since we have a Linux server.</p> + </li> + <li> + <p>Docker images can easily eat up our disk spaces.</p> + </li> +</ul> -<p>What can be done?</p> +<p>in ~/.zsh_history</p> -<p>We can keep track of images of Docker</p> - +<pre><code class="language-c">: 1561014922:0;docker system prune +: 1561014973:0;docker container prune +: 1561015350:0;docker image prune +: 1561015362:0;docker volume prune +</code></pre> </div> @@ -261,13 +357,10 @@ <ul> <li> - <p>Docker environment poses some problems, some of which are difficult to comprehend</p> + <p>Docker environment poses some problems, some of which are difficult to comprehend.</p> </li> <li> - <p>Storage is difficult too</p> - </li> - <li> - <p>Yet, it gives a good insight of the underlying important concepts of operating system beacuse it is well documented, fast and uses less resources</p> + <p>Yet, it gives a good insight of the underlying important concepts of operating system because it is well documented, fast and uses less resources.</p> </li> </ul>