Tracing built-in drivers ?

[Andrey Skvortsov]

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. 



-- 
Best regards,
Andrey Skvortsov

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