Tracing built-in drivers ?

[Jay Aurabind]

On 8 December 2015 at 19:29, Andrey Skvortsov
<andrej.skvortzov at gmail.com> wrote:
> On 08 Dec, Jay Aurabind wrote:
>> Hi,
>>
>> I know I can use ftrace or perf to do tracing on modules that I can
>> load from the userspace. But what if I want to do tracing on a driver
>> which is built in ? For example, i915. There wouldnt be any userspace
>> to trigger a trace when  it does an init. Even if I recompile i915 as
>> a module, I am not able to unload it.
>>
>> Are there any specific tools or techniques for doing this ?
>
> Hi, Jay,
>
> if you need to trace init functions of built-in drivers, you can
> enable ftrace at kernel start using parameters:
> ftrace, ftrace_filter, ftrace_notrace,... .
>
> See Documentation/kernel-parameters.txt for more details.
>
>

Thank you  Andrey.
>
> --
> Best regards,
> Andrey Skvortsov
>
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-- 

Thanks and Regards,
Aurabindo J