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    SubjectRe: [RFC PATCH tracing/kprobes 0/5] tracing/kprobes, perf: perf kprobe support
    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).

    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. :)

    Thank you,

    --
    Masami Hiramatsu

    Software Engineer
    Hitachi Computer Products (America), Inc.
    Software Solutions Division

    e-mail: mhiramat@redhat.com



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