Mercurial > hg > Papers > 2020 > anatofuz-sigos

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slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id="p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1">
+<h1>xv6の構成要素の継続の分析</h1>
+<ul>
+<li>清水 隆博
+<ul>
+<li>琉球大学大学院理工学研究科情報工学専攻</li>
+</ul>
+</li>
+<li>河野 真治
+<ul>
+<li>琉球大学工学部</li>
+</ul>
+</li>
+</ul>
+</section>
+</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2">
+<h1>研究目的</h1>
+<ul>
+<li>アプリケーションの信頼性を向上させるたい
+<ul>
+<li>その為には土台となる OS 自体の信頼性を高く保証したい</li>
+</ul>
+</li>
+<li>OSそのものも巨大なプログラムである
+<ul>
+<li>テストコードを用いた方法で信頼性を確保する事が可能</li>
+</ul>
+</li>
+<li>しかし並列並行処理などに起因するバグや、そもそもOSを構成する処理が巨大
+<ul>
+<li>テストで完全にバグを発見するのは困難</li>
+<li>テスト以外の方法でOSの信頼性を高めたい</li>
+</ul>
+</li>
+</ul>
+</section>
+</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3">
+<h1>OSの信頼性</h1>
+<ul>
+<li>OSそのもの動作も保証されるべき</li>
+<li>アプリケーションが行いたい処理の他に、 メモリやCPUの資源管理などが存在する
+<ul>
+<li>アプリケーション側からするとOSの機能</li>
+</ul>
+</li>
+<li>本来行いたい処理
+<ul>
+<li>ノーマルレベルと呼ぶ</li>
+</ul>
+</li>
+<li>資源管理など
+<ul>
+<li>メタレベルと呼ぶ</li>
+<li>この別け方はOSの実装でも存在する</li>
+</ul>
+</li>
+<li>ノーマル、メタレベルの計算の両方を保証しないといけない</li>
+</ul>
+</section>
+</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4">
+<h1>テスト以外で信頼性を高める方法</h1>
+<ul>
+<li>モデル検査
+<ul>
+<li>実際に想定されるパターンを全て動かして検証する</li>
+<li>デッドロック発生の検知
+<ul>
+<li>JavaPathFinderなど</li>
+</ul>
+</li>
+</ul>
+</li>
+<li>定理証明支援系
+<ul>
+<li>論理学的なモデルに変更して証明する
+<ul>
+<li>Agda</li>
+<li>Coq</li>
+</ul>
+</li>
+</ul>
+</li>
+<li>OSをこれらの方法で信頼性を高めたい</li>
+</ul>
+</section>
+</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5">
+<h1>OSの信頼性を高めるためには</h1>
+<ul>
+<li>既存のOSのソースコードをそのまま使うのは困難</li>
+<li>モデル検査の場合
+<ul>
+<li>OS自体をモデル検査する機能をOSに組み込む必要がある</li>
+</ul>
+</li>
+<li>定理証明系の場合
+<ul>
+<li>Agda/CoqでOSを再実装する必要がある</li>
+<li>それらのコードはそのままコンパイルする事ができない</li>
+</ul>
+</li>
+<li>ノーマルレベル/メタレベルを切り分けるのも困難</li>
+<li>動きつつ証明可能なOSを目指したい
+<ul>
+<li>これらを同時に達成出来るプログラミング言語でOSを実装する必要がある</li>
+</ul>
+</li>
+</ul>
+</section>
+</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6">
+<h1>Continuation Based C</h1>
+<ul>
+<li>ノーマルレベル/メタレベルの実装に適している言語</li>
+<li>C言語の下位言語であり、 いくつかのCコンパイラ上で実装している
+<ul>
+<li>gcc</li>
+<li>llvm/clang</li>
+</ul>
+</li>
+</ul>
+</section>
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/slide/slide.md	Tue May 26 18:36:10 2020 +0900
@@ -0,0 +1,66 @@
+# xv6の構成要素の継続の分析
+
+- 清水 隆博
+    - 琉球大学大学院理工学研究科情報工学専攻
+- 河野 真治
+    - 琉球大学工学部
+
+
+---
+
+# 研究目的
+
+- アプリケーションの信頼性を向上させるたい
+  - その為には土台となる OS 自体の信頼性を高く保証したい
+- OSそのものも巨大なプログラムである
+    - テストコードを用いた方法で信頼性を確保する事が可能
+- しかし並列並行処理などに起因するバグや、そもそもOSを構成する処理が巨大
+    - テストで完全にバグを発見するのは困難
+    - テスト以外の方法でOSの信頼性を高めたい
+
+---
+# OSの信頼性
+- OSそのもの動作も保証されるべき
+- アプリケーションが行いたい処理の他に、 メモリやCPUの資源管理などが存在する
+    - アプリケーション側からするとOSの機能
+- 本来行いたい処理
+    - ノーマルレベルと呼ぶ
+- 資源管理など
+    - メタレベルと呼ぶ
+    - この別け方はOSの実装でも存在する
+- ノーマル、メタレベルの計算の両方を保証しないといけない
+
+---
+
+# テスト以外で信頼性を高める方法
+- モデル検査
+    - 実際に想定されるパターンを全て動かして検証する
+    - デッドロック発生の検知
+      - JavaPathFinderなど
+- 定理証明支援系
+    - 論理学的なモデルに変更して証明する
+      - Agda
+      - Coq
+- OSをこれらの方法で信頼性を高めたい
+
+
+
+---
+
+# OSの信頼性を高めるためには
+- 既存のOSのソースコードをそのまま使うのは困難
+- モデル検査の場合
+    - OS自体をモデル検査する機能をOSに組み込む必要がある
+- 定理証明系の場合
+    - Agda/CoqでOSを再実装する必要がある
+    - それらのコードはそのままコンパイルする事ができない
+- ノーマルレベル/メタレベルを切り分けるのも困難
+- 動きつつ証明可能なOSを目指したい
+    - これらを同時に達成出来るプログラミング言語でOSを実装する必要がある
+
+---
+# Continuation Based C
+- ノーマルレベル/メタレベルの実装に適している言語
+- C言語の下位言語であり、 いくつかのCコンパイラ上で実装している
+    - gcc
+    - llvm/clang