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Line 10:
echo 0 > tracing_on
echo function_graph > current_tracer
echo $func > set_graph_function
echo 1 > tracing_on
echo > trace
# do thing here
echo 0 > tracing_on
echo nop > current_tracer
# save trace
cp trace /tmp/trace.txt
</source>
[[Category:Linux kernel]]
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Latest revision as of 14:37, 7 October 2022
Trace a single system call
This generates a function graph trace of a specific function and its callees:
# function to trace
func=ksys_mount
cd /sys/kernel/debug/tracing/
echo 0 > tracing_on
echo function_graph > current_tracer
echo $func > set_graph_function
echo 1 > tracing_on
echo > trace
# do thing here
echo 0 > tracing_on
echo nop > current_tracer
# save trace
cp trace /tmp/trace.txt