Citando Daniel Thompson <daniel.thomp...@linaro.org>:
> On 14/11/14 01:29, joaoandrefe...@sapo.pt wrote:
>> Citando Daniel Thompson <daniel.thomp...@linaro.org>:
>>
>>> On 06/11/14 23:36, joaoandrefe...@sapo.pt wrote:
>>>> Good evening,
>>>>
>>>> I'm wondering how complex (or possible) would be to instrument locally
>>>> KGDB on the target machine, i. e., somehow remove the serial
>>>> connection (and the host machine, GDB) from the setup, since on this
>>>> new scenario the host (GDB) and the target (KGDB) would run on the
>>>> same machine. Is this idea as absurd as it possibly seems?
>>>
>>> Normally if you have to do self hosted kernel debug you would enable kdb
>>> instead.
>>>
>>> I only really bring this up because in a previous post you linked to an
>>> old copy of the kgdb manual which predated the merging of kdb into the
>>> kernel. Either way you might prefer to refer to this instead:
>>>
>>> https://www.kernel.org/doc/htmldocs/kgdb/index.html
>>>
>>>
>>> Daniel.
>>
>> I'm using KGDB to do some fault-injection into the kernel. I found that
>> link while searching for some KGDB documentation. I've heard of KDB
>> before, but never really tried it. I've also read somewhere that it is
>> also much less powerful than KGDB, but of course I don't know if this is
>> really true, I think it will also depend on the goal we have in mind.
>> Did you ever used it? And do you know if it's included in the kernel,
>> like KGDB?
>
> It's included in the kernel and uses the same debug core operations. I
> guess this means, technically speaking, its equivalently powerful (same
> memory access, same breakpointing approach, etc). However in practice it
> is less powerful because it has no support for symbolic debugging. It is
> a bits-and-bytes level debugger rather than a C code debugger.
>
> Its key advantage is that it does not require gdb on the host nor a copy
> of vmlinux which mean in some situations it is much easier to deploy.
>
> It has all the same issues that kgdb does with regard to stopping the
> target (it uses the same techniques and therefore performance will be
> similar).
Thanks for your clarifications, they are very helpful. It is possoble
that I take a look into KDB on the near future.
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