diff --git a/labs/debugging-system-wide-profiling/debugging-system-wide-profiling.tex b/labs/debugging-system-wide-profiling/debugging-system-wide-profiling.tex index 8be7497873..fd42fae09e 100644 --- a/labs/debugging-system-wide-profiling/debugging-system-wide-profiling.tex +++ b/labs/debugging-system-wide-profiling/debugging-system-wide-profiling.tex @@ -67,6 +67,13 @@ \section{ftrace \& uprobes} ^C \end{bashinput} +{\em Note: if during the recording you encounter an \code{Unsupported file +version 7} error, it likely means that the trace-cmd tool on your +workstation is older than the one on the target, and does not understand +the default trace format used by the target. You can force trace-cmd on the +target to use an older version of the trace data format by also providing +\code{--file-version=6} on the recording command} + Then, using kernelshark tool on the host, analyze the trace: \begin{bashinput}