ftrace: Difference between revisions
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echo 0 > tracing_on |
echo 0 > tracing_on |
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echo function_graph > current_tracer |
echo function_graph > current_tracer |
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echo set_graph_function > set_graph_function |
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echo $func > set_graph_function |
echo $func > set_graph_function |
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echo 1 > tracing_on |
echo 1 > tracing_on |
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echo > trace |
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# do thing here |
# do thing here |
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echo 0 > tracing_on |
echo 0 > tracing_on |
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echo nop > current_tracer |
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# save trace |
# save trace |
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cp trace /tmp/trace.txt |
cp trace /tmp/trace.txt |
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</source> |
</source> |
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[[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