m2-internship/talk-2018-11-uppsala
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Unw data slow: not by dft. -> must dump to disk

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Théophile Bastian 2019-10-19 08:09:22 +02:00
parent 24f53aa0de
commit 21ca3e2605
1 changed files with 9 additions and 7 deletions
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slides.tex
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@ -36,9 +36,9 @@
\newcommand{\cmark}{\color{OliveGreen}\ding{52}}
\newcommand{\xmark}{\color{BrickRed}\ding{56}}
\let\tempone\itemize
\let\temptwo\enditemize
\renewenvironment{itemize}{\tempone\addtolength{\itemsep}{0.5\baselineskip}}{\temptwo}
%\let\tempone\itemize
%\let\temptwo\enditemize
%\renewenvironment{itemize}{\tempone\addtolength{\itemsep}{0.5\baselineskip}}{\temptwo}
@ -498,8 +498,8 @@ Segmentation fault.
\item Heuristic to decide whether we index with \reg{rbp} or
\reg{rsp}
\end{itemize}
\item By performing \alert{symbolic execution} with an abstract
semantics, we can \alert{synthesize the
\item With a \alert{symbolic execution} with an abstract semantics,\\
we can \alert{synthesize the
unwinding table} line by line.
\item Control flow: forward data-flow analysis
\item The fixpoints are immediate, cf article
@ -535,8 +535,10 @@ Segmentation fault.
\pause{}
So much that \prog{perf} doesn't use it by default! You must use
\lstbash{perf report --call-graph dwarf} explicitly!
So much that \prog{perf} cannot unwind online!
It must \alert{copy to disk the whole call stack} every few instants and
\alert{analyze it later} at report time!
\end{frame}
\sectiontitleframe{}