On 8 December 2015 at 19:29, Andrey Skvortsov <andrej.skvortzov@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