Add Torvalds' picture

slides.tex

@@ -36,10 +36,6 @@
     \ifthenelse{\theframenumber = 0}
         {}
         {\insertframenumber/\inserttotalframenumber}}
-\newcommand{\sectionline}{
-    \ifthenelse{\thesection = 0}
-    {}
-    {\Roman{section}~-- \insertsection}}
 
 \newcommand{\cmark}{\color{OliveGreen}\ding{52}}
 \newcommand{\xmark}{\color{BrickRed}\ding{56}}
@@ -59,6 +55,20 @@
     sensitive=false,
 }
 
+\setbeamertemplate{footline}
+{
+  \leavevmode%
+  \hbox{%
+      \hskip0.9\paperwidth
+  %\begin{beamercolorbox}[wd=.4\paperwidth,ht=2.25ex,dp=1ex,center]{author in head/foot}%
+  %  \usebeamerfont{author in head/foot}\insertshortauthor
+  %\end{beamercolorbox}%
+      \begin{beamercolorbox}[center, wd=.1\paperwidth,ht=2.25ex,dp=1ex,center]{title in head/foot}%
+          \slidecountline{}
+  \end{beamercolorbox}}%
+  \vskip0pt%
+}
+
 
 \newcolumntype{b}{X}
 \newcolumntype{s}{>{\hsize=.43\hsize}X}
@@ -67,7 +77,7 @@
 {\lstinline[language=C, keepspaces=true, basicstyle=\ttfamily]}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\title[\sectionline] {Reliable and Fast DWARF-based Stack Unwinding}
+\title[] {Reliable and Fast DWARF-based Stack Unwinding}
 \author[\slidecountline]{\textbf{Théophile Bastian}\\
     \textbf{Stephen Kell} \\
 \textbf{Francesco Zappa Nardelli}}
@@ -142,7 +152,7 @@ Segmentation fault.
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \subsection{Stack frames and unwinding}
 
-\begin{frame}{Call stack and registers}
+\begin{frame}
     \begin{columns}[c]
         \begin{column}{0.55\textwidth}
             \begin{center}
@@ -186,84 +196,63 @@ Segmentation fault.
 0084a19 & rsp+56 & c-56 & c-48 & c-40 & c-32 & c-24 & c-16 & c-8 \\
 0084a1d & rsp+48 & c-56 & c-48 & c-40 & c-32 & c-24 & c-16 & c-8 \\
 0084a1e & rsp+40 & c-56 & c-48 & c-40 & c-32 & c-24 & c-16 & c-8 \\
-0084a20 & rsp+32 & c-56 & c-48 & c-40 & c-32 & c-24 & c-16 & c-8 \\
-0084a22 & rsp+24 & c-56 & c-48 & c-40 & c-32 & c-24 & c-16 & c-8 \\
-0084a24 & rsp+16 & c-56 & c-48 & c-40 & c-32 & c-24 & c-16 & c-8 \\
-0084a26 & rsp+8 & c-56 & c-48 & c-40 & c-32 & c-24 & c-16 & c-8 \\
-0084a30 & rsp+64 & c-56 & c-48 & c-40 & c-32 & c-24 & c-16 & c-8 \\
     \end{tabular}
+    \vspace{1em}
 
-    \pause{}
-
-    \vspace{-3cm}
-    \hfill\includegraphics[height=3cm, angle=45, origin=c]{img/dwarf_logo}
-    \hspace{-1cm}
+    \only<1>{\vspace{19mm}}
+    \begin{columns}
+        \begin{column}{0.50\textwidth}
+            \only<2->{
+                \begin{tcolorbox}[enhanced, halign=center, frame hidden, colback=YellowGreen]
+                    \textbf{For each instruction\ldots}\\
+                    (identified by its program counter)
+                \end{tcolorbox}
+            }
+        \end{column}
+        \begin{column}{0.50\textwidth}
+            \only<3->{
+                \begin{tcolorbox}[enhanced, halign=center, frame hidden,
+                        interior style={right color=Apricot, left color=Thistle}]
+                        \textbf{\ldots{}an expression to compute its return address
+                        location on the stack}
+                \end{tcolorbox}
+            }
+        \end{column}
+    \end{columns}
 \end{frame}
 
 \begin{frame}[t, fragile]{The real DWARF}
     \begin{lstlisting}[numbers=none, language=]
-00009b30 48 009b34 FDE cie=0000 pc=0084950..0084b37
-  DW_CFA_advance_loc: 2 to 0000000000084952
+30 24 34 FDE pc=004020..004040
   DW_CFA_def_cfa_offset: 16
-  DW_CFA_offset: r15 (r15) at cfa-16
-  DW_CFA_advance_loc: 2 to 0000000000084954
+  DW_CFA_advance_loc: 6 to 0000000000004026
   DW_CFA_def_cfa_offset: 24
-  DW_CFA_offset: r14 (r14) at cfa-24
-  DW_CFA_advance_loc: 2 to 0000000000084956
-  DW_CFA_def_cfa_offset: 32
-  DW_CFA_offset: r13 (r13) at cfa-32
-  DW_CFA_advance_loc: 2 to 0000000000084958
-  DW_CFA_def_cfa_offset: 40
-  DW_CFA_offset: r12 (r12) at cfa-40
-  DW_CFA_advance_loc: 1 to 0000000000084959
+  DW_CFA_advance_loc: 10 to 0000000000004030
+  DW_CFA_def_cfa_expression (DW_OP_breg7 (rsp): 8; DW_OP_breg16 (rip): 0; DW_OP_lit15; DW_OP_and; DW_OP_lit11; DW_OP_ge; DW_OP_lit3; DW_OP_shl; DW_OP_plus)
   [...]
     \end{lstlisting}
 
     \begin{itemize}
         \item[\textbf{$\longrightarrow$}] \textbf{\alert{constructed} on-demand
-            by a \alert{Turing-complete bytecode}!}
+            by a \alert{Turing-complete stack machine}!}
     \end{itemize}
 
     \pause{}
 
-    \vspace{-6.5cm}
-    \begin{center}
-    \bf \fontsize{8cm}{1cm}
-        \colorbox{white}{\alert{Complex}} \\
-        \colorbox{white}{\alert{\& slow!}}
-    \end{center}
-\end{frame}
+    \vspace{-5cm}
+    \begin{tcolorbox}[halign=center, colframe=red, colback=Lavender]
+        \bf \huge
+        Complex \,\& \,slow
+    \end{tcolorbox}
 
-\begin{frame}{Why does slow matter?}
-    \begin{itemize}
-
-        \item{} After all, we're talking about \alert{debugging procedures} ran
-            by a \alert{human being} (slower than the machine).
-
-            \ldots{}or are we?
-    \end{itemize}
-
-    \pause{}
-    \begin{center}
-        \textbf{\Large{}No!}
-    \end{center}
-
-    \begin{itemize}
-        \pause{}\item{} Pretty much any \alert{program analysis tool}
-        \pause{}\item{} \alert{Profiling} with polling profilers
-
-        \pause{}\item{} \alert{Exception handling} in C++
-
-    \end{itemize}
-
-    \vspace{2em}
-
-    \begin{center}
-        \textbf{\Large{}Debug data is not only for debugging}
-    \end{center}
-
-    \vspace{1em}
-    $\leadsto$ we might want \alert{an alternative time/space trade-off}
+	\pause{}
+    \begin{tcolorbox}[halign=center, colframe=red, colback=Lavender]
+        \huge
+        \textbf{Pervasive:}\\ relied upon by debuggers, profilers, C++
+        exceptions \\
+        \medskip{}
+        \textbf{$\leadsto$ not only for debuggers!}
+	\end{tcolorbox}
 \end{frame}
 
 \newcommand{\LinusMailOne}{
@@ -283,8 +272,15 @@ Segmentation fault.
 \newcommand{\LinusSource}{
     \hfill ---~Linus Torvalds, 2012
 }
-\begin{frame}{A debugging hell: Linux kernel}
-    \LinusMailOne{}
+\begin{frame}
+    \begin{columns}
+        \begin{column}{0.75\textwidth}
+            \LinusMailOne{}
+        \end{column}
+        \begin{column}{0.25\textwidth}
+            \includegraphics[width=\textwidth]{img/roundtorvalds.png}
+        \end{column}
+    \end{columns}
 
     \only<1-2>{
         \vspace{1em}
@@ -324,7 +320,7 @@ Segmentation fault.
     \end{block}}
 \newcommand{\tblhl}{\rowcolor{Tan}}
 
-\begin{frame}{Working on an example}
+\begin{frame}
     \newcommand{\firsttblrows}{
 \tblrowval{\hspace{-2ex}<{\bf foo}>:}{}{\textbf{CFA}}{\textbf{ra}}
 \rowonly<3>{\tblhl{}}  \tblrowval{push}{\%r15}{rsp+8}{c-8}
@@ -422,7 +418,7 @@ Segmentation fault.
 
 \subsection{Compilation ahead-of-time}
 
-\begin{frame}{Compilation overview}
+\begin{frame}
     \begin{itemize}
         \item Compiled to \alert{C code}
         \item C code then \alert{compiled to native binary} (gcc)
@@ -439,7 +435,7 @@ Segmentation fault.
 
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[shrink]{Compilation example: generated C}
+\begin{frame}[shrink]
     \lstinputlisting[language=C]{src/fib7/fib7.eh_elf_basic.c}
 
     \pause{}
@@ -452,7 +448,7 @@ Segmentation fault.
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-\begin{frame}{Mostly plug-and-play: libunwind interface}
+\begin{frame}
     \begin{itemize}
         \item \alert{libunwind}: \textit{de facto} standard library for
             unwinding
@@ -492,7 +488,7 @@ Segmentation fault.
 \section*{Conclusion}
 \setcounter{section}{0}
 
-\begin{frame}{A fragment of our article}
+\begin{frame}
     The original article \textbf{Reliable and Fast DWARF-based Stack Unwinding}
     contains