Web Reference: To have the trace_printk() content, and some other internal tracing go to the preserved buffer (like dump stacks), either set the instance to be the trace_printk() destination from the kernel command line, or set it after boot up via the trace_printk_dest option. Jul 8, 2022 · How do tracefs and debugfs differ? It looks like both can trace functions, system calls, etc. When to go for debugfs and when should we should use tracefs? You should use /sys/kernel/tracing. Both /sys/kernel/tracing and /sys/kernel/debug/tracing are tracefs mounts, so in theory they are equivalent. Record a trace After enabling the events you want to see, do: $ cd /sys/kernel/debug/tracing # Start recording to the ringbuffer $ echo 1 > tracing_on # Stop recording to the ringbuffer $ echo 0 > tracing_on
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