@@ -175,6 +175,22 @@ unless you have specific needs for more advanced backends.
The "simple" backend currently does not capture string arguments, it simply
records the char* pointer value instead of the string that is pointed to.
+=== Ftrace ===
+The "ftrace" backend writes trace data to ftrace marker. This effectively
+sends trace events to ftrace ring buffer, and you can compare qemu trace
+data and kernel(especially kvm.ko when using KVM) trace data.
+if you use KVM, enable kvm events in ftrace:
+ # echo 1 > /sys/kernel/debug/tracing/events/kvm/enable
+After running qemu by root user, you can get the trace:
+ # cat /sys/kernel/debug/tracing/trace
+Restriction: "ftrace" backend is restricted to Linux only.
==== Monitor commands ====
* trace-file on|off|flush|set <path>