Re: [Dle-develop] [RFC PATCH tracing/kprobes 0/5] tracing/kprobes, perf: perf kprobe support

[Arnaldo C. de M. <ac...@re...>]

Em Wed, Sep 30, 2009 at 02:04:18PM +0200, Ingo Molnar escreveu:
> 
> * Masami Hiramatsu <mhi...@re...> wrote:
> 
> > Masami Hiramatsu wrote:
> >>
> >> Hi,
> >>
> >> These patches introduce perf kprobe command and update kprobe-tracer.
> >> perf kprobe command allows you to add new probe points by C line number
> >> and local variable names.
> >
> > Last week, Arnaldo and I talked about this command, and he suggested 
> > that the command would be better 'perf probe', because it would be 
> > able to cover both of kernel space (by kprobes) and user space (by 
> > uprobes).
> 
> Agreed.
> 
> > Basically, I agree with his idea. But I think we may need to consider 
> > more flexible syntax for that purpose before we support uprobes. In 
> > this area, SystemTap has done big advance, we can see how many 
> > varieties of syntax it has by 'man stapprobes'.
> >
> > And also, it's hard to decide it without real uprobe-tracer (and 
> > uprobes too!) implementation on ftrace. So, I think it is better to 
> > continue using 'perf kprobe' in this time.
> >
> > But it's worth to add to todo list. :)
> 
> I'd still name it 'perf probe', even if initially it supports kprobes.

Agreed.

- Arnaldo