On Wed, Jul 6, 2011 at 12:47 AM, Zheng Da <zhengda1936@gmail.com> wrote:
Hello
Can we profile the kernel during its initialization? perf is initialized in an early stage in start_kernel(), but it seems there are no command-line parameters to enable it. Does anyone have any ideas how to profile the kernel during its initialization (before user space programs start to run)? I think someone should have the similar problem as me, and there should be some solutions.
Thanks, Da
_______________________________________________ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Hi Da, Have a look at ftrace. It could be used to profile initcalls. Just add following boot options: initcall_debug, ftrace=initcall More details on http://www.omappedia.org/wiki/Installing_and_Using_Ftrace#Boot_Tracer