[uml-devel] query on STDERR output from UML tracing

[uml-devel] query on STDERR output from UML tracing

[Peter Teoh]

As I used gdb to trace UML execution, only three lines were output to STDERR:

  - /proc/mm...not found: No such file or directory
  - PTRACE_FAULTINFO...not found
  - PTRACE_LDT...not found

What are these?   How to turn them on?   What is the implication of
not having these features?

-- 
Regards,
Peter Teoh

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Re: [uml-devel] query on STDERR output from UML tracing

[Karol Swietlicki]

On 12/11/2008, Peter Teoh <htmldeveloper@gmail.com> wrote:
> As I used gdb to trace UML execution, only three lines were output to
> STDERR:
>
>   - /proc/mm...not found: No such file or directory
>   - PTRACE_FAULTINFO...not found
>   - PTRACE_LDT...not found
>
> What are these?   How to turn them on?   What is the implication of
> not having these features?

Those lines mean that you do not have SKAS3/4 patches in your kernel.
They are not essential for UML, but having them can give you a
performance boost.

Karol Swietlicki

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