ftrace: Difference between revisions

From vegard.wiki
Jump to navigation Jump to search
Content added Content deleted
(fix)
(add category)
 
(One intermediate revision by the same user not shown)
Line 12: Line 12:
echo $func > set_graph_function
echo $func > set_graph_function
echo 1 > tracing_on
echo 1 > tracing_on
echo > trace


# do thing here
# do thing here


echo 0 > tracing_on
echo 0 > tracing_on
echo nop > current_tracer


# save trace
# save trace
cp trace /tmp/trace.txt
cp trace /tmp/trace.txt
</source>
</source>

[[Category:Linux kernel]]

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