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ftrace.md

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FTrace

Ftrace is kernel built in feature that enables tracing kernel function calls.

Quick start

change directory to debugfs

 # cd /sys/kernel/debug/tracing

check current_tracer

 # cat current_tracer
 nop

enable function trace

# echo function > current_tracer

view trace

# cat trace | less
...
        bash-8329  [000] d... 80604.787465: account_system_time <-__vtime_account_system
        bash-8329  [000] d... 80604.787466: cpuacct_account_field <-account_system_time

disable trace

# echo nop > current_tracer

References