请教，linux kernel中 trace_event tracepoint的区别

cuibixiong_cu

请教各位大侠，我现在想在kernel中trace一些event，比如说是kthread_create或者是task migrate，现在我在kernel中看到了两种机制，一种是trace_event，另外一种是tracepoint，请教，两种有什么差别？

cuibixiong_cu

http://netsplit.com/2011/03/07/tracing-on-linux/

So you know about tracepoints, and you’ve almost certainly heard about Trace Events, but what’s the difference? Well firstly trace events are actually built on tracepoints, you can think of them as a higher level API – and that’s why I covered tracepoints first. Secondly trace events are usable from userspace! we don’t need to write kernel modules to be able to hook into them, but obviously we can only read data this way.

自问自答，基本上我的理解tracepoint是可以debug用，trace_event是可以结合ftrace profile用