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Added content in post and about
* Add xv6 debug * Fix paper links in about me page
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I""{"source"=>"/Users/pengzhan/Github/codersherlock.github.io", "destination"=>"/Users/pengzhan/Github/codersherlock.github.io/_site", "collections_dir"=>"", "cache_dir"=>".jekyll-cache", "plugins_dir"=>"_plugins", "layouts_dir"=>"_layouts", "data_dir"=>"_data", "includes_dir"=>"_includes", "collections"=>{"posts"=>{"output"=>true, "permalink"=>"/archivers/:title"}}, "safe"=>false, "include"=>[".htaccess"], "exclude"=>[".sass-cache", ".jekyll-cache", "gemfiles", "Gemfile", "Gemfile.lock", "node_modules", "vendor/bundle/", "vendor/cache/", "vendor/gems/", "vendor/ruby/"], "keep_files"=>[".git", ".svn"], "encoding"=>"utf-8", "markdown_ext"=>"markdown,mkdown,mkdn,mkd,md", "strict_front_matter"=>false, "show_drafts"=>nil, "limit_posts"=>0, "future"=>false, "unpublished"=>false, "whitelist"=>[], "plugins"=>[], "markdown"=>"kramdown", "highlighter"=>"rouge", "lsi"=>false, "excerpt_separator"=>"\n\n", "incremental"=>false, "detach"=>false, "port"=>"4000", "host"=>"127.0.0.1", "baseurl"=>"", "show_dir_listing"=>false, "permalink"=>"/archivers/:title", "paginate_path"=>"page:num", "timezone"=>nil, "quiet"=>false, "verbose"=>false, "defaults"=>[], "liquid"=>{"error_mode"=>"warn", "strict_filters"=>false, "strict_variables"=>false}, "kramdown"=>{"auto_ids"=>true, "toc_levels"=>[1, 2, 3, 4, 5, 6], "entity_output"=>"as_char", "smart_quotes"=>"lsquo,rsquo,ldquo,rdquo", "input"=>"GFM", "hard_wrap"=>false, "guess_lang"=>true, "footnote_nr"=>1, "show_warnings"=>false, "syntax_highlighter"=>"rouge"}, "title"=>"Stop Talking, Start Doing - 停止空想，开始行动", "author"=>"Pengzhan Hao", "avatar"=>"/static/avatar.jpg", "email"=>"haopengzhan@gmail.com", "description"=>"My personal blog, with some boring research staff and some tricks I was fancy to. I'll try my best to make this blog fun and useful. Not just a place I complain about all happens in my Lab.\n", "url"=>"https://codersherlock.github.com/", "github_username"=>"codersherlock", "disqus_shortname"=>"codersherlockblog", "gems"=>["jekyll-paginate", "jekyll-gist", "jemoji"], "paginate"=>5, "serving"=>false}:ET
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I"{"source"=>"/home/pengzhan/Github/CoderSherlock.github.io", "destination"=>"/home/pengzhan/Github/CoderSherlock.github.io/_site", "collections_dir"=>"", "cache_dir"=>".jekyll-cache", "plugins_dir"=>"_plugins", "layouts_dir"=>"_layouts", "data_dir"=>"_data", "includes_dir"=>"_includes", "collections"=>{"posts"=>{"output"=>true, "permalink"=>"/archivers/:title"}}, "safe"=>false, "include"=>[".htaccess"], "exclude"=>[".sass-cache", ".jekyll-cache", "gemfiles", "Gemfile", "Gemfile.lock", "node_modules", "vendor/bundle/", "vendor/cache/", "vendor/gems/", "vendor/ruby/"], "keep_files"=>[".git", ".svn"], "encoding"=>"utf-8", "markdown_ext"=>"markdown,mkdown,mkdn,mkd,md", "strict_front_matter"=>false, "show_drafts"=>nil, "limit_posts"=>0, "future"=>false, "unpublished"=>false, "whitelist"=>[], "plugins"=>[], "markdown"=>"kramdown", "highlighter"=>"rouge", "lsi"=>false, "excerpt_separator"=>"\n\n", "incremental"=>false, "detach"=>false, "port"=>"4000", "host"=>"127.0.0.1", "baseurl"=>"", "show_dir_listing"=>false, "permalink"=>"/archivers/:title", "paginate_path"=>"page:num", "timezone"=>nil, "quiet"=>false, "verbose"=>false, "defaults"=>[], "liquid"=>{"error_mode"=>"warn", "strict_filters"=>false, "strict_variables"=>false}, "kramdown"=>{"auto_ids"=>true, "toc_levels"=>[1, 2, 3, 4, 5, 6], "entity_output"=>"as_char", "smart_quotes"=>"lsquo,rsquo,ldquo,rdquo", "input"=>"GFM", "hard_wrap"=>false, "guess_lang"=>true, "footnote_nr"=>1, "show_warnings"=>false, "syntax_highlighter"=>"rouge"}, "title"=>"Stop Talking, Start Doing", "author"=>"Pengzhan Hao", "avatar"=>"/static/avatar.jpg", "email"=>"haopengzhan@gmail.com", "description"=>"My personal blog, with some boring research staff and some tricks I was fancy to. I'll try my best to make this blog fun and useful. Not just a place I complain about all happens in my Lab.\n", "url"=>"https://codersherlock.github.com/", "github_username"=>"codersherlock", "disqus_shortname"=>"codersherlockblog", "gems"=>["jekyll-paginate", "jekyll-gist", "jemoji"], "paginate"=>5, "serving"=>false}:ET
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I"Õ<h1 id="pengzhan-hao">Pengzhan Hao</h1>
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<p><strong>Position:</strong> Â Â Â Â Â Â Â Â Research Assistant in MOSLab<br />
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<strong>Education:</strong> Â Â Â Â Â Doctoral Student of SUNY at Binghamton<br />
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<strong>Email:</strong> Â Â Â Â Â Â Â Â Â Â Â Â phao3 at binghamton dot edu<br />
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<strong>Address:</strong><br />
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                        MOSLab, H-6 Engineering Building<br />
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                        Binghamton University<br />
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                        4400 Vestal Parkway East<br />
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                        Binghamton, NY 13902</p>
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<h2 id="education">Education</h2>
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<ul>
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<li>2017.08 - Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Ph.D. in Computer Science, Binghamton University, NY, USA</li>
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<li>2015.08 - 2017.05 Â Â M.E in Computer Science, Binghamton University, NY, USA</li>
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<li>2011.08 - 2015.06 Â Â B.E in Software Engineering, Beihang University, Beijing, China</li>
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</ul>
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<h2 id="experience">Experience</h2>
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<ul>
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<li>2013.10 - 2014.09 Â Â <strong><em>Research Intern</em></strong> @ Advanced computer application technology engineering Research Center, Ministry of Education, China
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<ul>
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<li>Analyzed real-time routing problem and reliable algorithm design</li>
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<li>Led and developed a routing system mostly backend server program</li>
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<li>Participated in vehicle internet research</li>
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<li>Supervised by <a href="http://scse.buaa.edu.cn/buaa-css-web/toCardDetailAction.action?firstSelId=CARD_TMPL_OF_FIRST_NAVI_CN&secondSelId=CARD_TMPL_OF_ALL_TEACHER_CN&thirdSelId=&cardId=105c1bfe787-4d33-48eb-a05f-e2a6f3934216&language=0&curSelectNavId=CARD_TMPL_OF_ALL_TEACHER_CN">Juhua Pu</a>, <a href="http://scse.buaa.edu.cn/buaa-css-web/toCardDetailAction.action?firstSelId=CARD_TMPL_OF_FIRST_NAVI_CN&secondSelId=CARD_TMPL_OF_ALL_TEACHER_CN&thirdSelId=&cardId=3063cc45-7b8b-441a-86b2-3a4f59c26bd40&language=0&curSelectNavId=CARD_TMPL_OF_ALL_TEACHER_CN">Zhang Xiong</a>, Related project: <a href="https://www.microsoft.com/en-us/research/project/urban-computing/">Urban Computing</a></li>
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</ul>
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</li>
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<li>2013.10 - 2014.01 Â Â <strong><em>Research Intern</em></strong> @ Institute of Software, Chinese Academy of Sciences, China
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<ul>
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<li>Analyzed mobile OS kernel and Localized portion with C language</li>
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<li>Supervised by <a href="http://soft.buaa.edu.cn/info/1060/1307.htm">Cangzhou Yuan</a></li>
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</ul>
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</li>
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</ul>
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<h2 id="research">Research</h2>
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<ul>
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<li>Graduate
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<ul>
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<li>Edge Computing
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<ul>
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<li>Network Performance</li>
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</ul>
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</li>
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<li>Vitrualization</li>
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</ul>
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</li>
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<li>Undergraduate
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<ul>
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<li>Urban Comuputing
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<ul>
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<li>Routing algorithm and system</li>
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<li>Real-time data processing</li>
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</ul>
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</li>
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<li>Mobile Operating System
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<ul>
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<li>Kernel Analysis</li>
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<li>Locolization</li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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<h2 id="publications">Publications</h2>
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<ul>
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<li>
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<p><strong><a href="">A Case for Web Service Bandwidth Reduction on Mobile Devices with Edge-hosted Personal Services </a></strong> <br />
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Yongshu Bai, <strong>Pengzhan Hao</strong>, and Yifan Zhang <br />
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The 37th IEEE International Conference on Computer Communications (<strong>IEEE INFOCOM</strong>)<br />
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Honolulu, HI, USA, 2018.</p>
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</li>
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<li>
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<p><strong><a href="/static/2018-02/a7-hao.pdf">EdgeCourier: An Edge-hosted Personal Service for Low-bandwidth Document Synchronization in Mobile Cloud Storage Services</a></strong> <strong>[<a href="">slide</a>]</strong><br />
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<strong>Pengzhan Hao</strong>, Yongshu Bai, Xin Zhang, and Yifan Zhang<br />
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The 2nd ACM/IEEE Symposium on Edge Computing (<strong>ACM/IEEE SEC</strong>)<br />
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San Jose, CA, USA, 2017.</p>
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</li>
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<li>
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<p><strong><a href="/static/2017-07/p169-zhang.pdf">Poster: Securing Device Inputs for Smartphones Using Hypervisor Based Approach</a></strong><br />
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Xin Zhang, Yongshu Bai, <strong>Pengzhan Hao</strong>, and Yifan Zhang<br />
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The 15th ACM International Conference on Mobile Systems, Applications, and Services (ACM MobiSys)<br />
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Niagara Falls, NY, USA, 2017.</p>
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</li>
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<li>
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<p><strong><a href="/static/2017-07/p163-hao.pdf">Poster: EPS - Edge-hosted Personal Services for Mobile Users</a> [<a href="/static/2017-07/eps_poster.pdf">poster</a>]</strong><br />
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<strong>Pengzhan Hao</strong>, Yongshu Bai, Xin Zhang, and Yifan Zhang<br />
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The 15th ACM International Conference on Mobile Systems, Applications, and Services (ACM MobiSys)<br />
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Niagara Falls, NY, USA, 2017.</p>
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</li>
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</ul>
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<h2 id="fun">Fun</h2>
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<ul>
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<li>My <a href="/timeline/index.html">Timeline</a></li>
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</ul>
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:ET
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I"± <p>I hate xv6, a stupid, useless education-oriented system. In this article, I will generally talk about how to implement system call to this operating system.</p>
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<h2 id="xv6-systemcall">Xv6 Systemcall</h2>
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<p>To invoke a system call, we have to first define a user mode function to be the interface of the kernel instruction in file <em>user.h</em>.</p>
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<div class="language-c highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kt">void</span> <span class="nf">function</span> <span class="p">(</span><span class="kt">void</span><span class="p">);</span>
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</code></pre></div></div>
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<p>This interface-like function will then pass the function name, in this case function, to <em>usys.S</em>. When using user mode function in programs, <em>usys.S</em> will generate a reference to SYS_function and push system call number of this function into %eax. After that, system can know from <em>syscall.c</em> and determining whether this system call is available. We must define same name system function and add it into <em>syscall.h</em> and <em>syscall.c</em>.</p>
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<div class="language-c highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cp">#define SYS_function ## // ## is the system call number
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</span><span class="p">[</span><span class="n">SYS_function</span><span class="p">]</span> <span class="n">sys_function</span> <span class="c1">// real system function name</span>
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<span class="k">extern</span> <span class="kt">int</span> <span class="nf">sys_function</span><span class="p">(</span><span class="kt">void</span><span class="p">);</span> <span class="c1">// real system function declaration</span>
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</code></pre></div></div>
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<p>After adding these sentences to syscall files, we can implement real function in specific place where you want to make the function works well.</p>
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<p>Sometimes, we need to pass variables among system calls. In this case, variables’ values are not necessary and even can’t be pass directly into system_function. When invoke a system call function, all variables of this system call will be pushed into current process’ stack. In file <em>syscall.c</em>, multiple functions are provided to get these variables from the process. I won’t waste time on explaining how to use these functions especially when elegant and detailed comments were written in source codes. However, I will explain concepts and how process organized and works in xv6 in future articles.</p>
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:ET
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I"¤<p>I hate xv6, a stupid, useless education-oriented system. In this article, I will generally talk about how to implement system call to this operating system.</p>
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:ET
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