# Re: \[RFC PATCH v1 1/1\] tracing/kprobe: Add multi-probe support for 'perf\_kprobe' PMU

- From: Francis Laniel \<hidden\>
- Date: 2023-08-18 18:14:31 
- List: linux-trace-kernel
- Page: https://ratatoskr.run/linux-trace-kernel/2023/08/2308552
- Thread: https://ratatoskr.run/linux-trace-kernel/2023/08/2305677/t.md

```text
Hi.

Le vendredi 18 août 2023, 17:41:41 CEST Steven Rostedt a écrit :
> On Fri, 18 Aug 2023 21:37:05 +0900
> 
> Masami Hiramatsu (Google) [ref] wrote:
> > That's why perf probe uses the offset from '_text'. Normal KASLR will just
> > moves all symbols. (Finer one will move all symbols randomely)
> > This should not need to access /proc/kallsyms but vmlinux or SystemMap.
> 
> We could just pass in: "_text+offset" too.

So, the idea would be to change the existing create_local_trace_kprobe() and 
above functions to indicate the user's offset is to be used against _text and 
not address?

> -- Steve

Best regards.


```