Re: Howto make perf probe work

[OSDepend <osdepend-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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>HI,
>Please enable kprobe_event config option in the kernel and build the same
>and boot the board using it. Then please try to add event using perf probe
>command

Thanks very much for your reply, and I already enable DEBUG_KPROBE_EVENT in kernel.
I did success in "perf probe handle_mm_fault".

But when i want to to "perf probe" other Kernel symbol, such as do_page_fault.
I came across other problems:
Added new event:
Failed to write event: Invalid argument
Error: Failed to add events. (-1)
And when i type perf probe page_fault_entry:
Kernel symbol 'page_fault_entry' not found.
Error: Failed to add events. (-2)
Please notice that "do_page_fault" and "page_fault_entry" are all Kernel symbols, which canbe find in  "/proc/kallsyms", but not recorgonized by perf (or even kprobe).
Any idea for that?

Best,
Chen

>>On Sun, Mar 31, 2013 at 11:00 PM, OSDepend <osdepend-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>>Hi all,
>>        Is there any way to use perf probe to add new tracepoint like pagefault enter/exit?
>>        When I type perf probe fault:10
>>       I always get the error as follow:
>>                Debuginfo-analysis is not supported.
>>                Error: Failed to add events. (-38)
>>        What exactly i miss to get the perf probe work correctly?
>>Best,
>>Chen

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