On 07/05/11 21:17, Vladimir Murzin wrote: > On Wed, Jul 6, 2011 at 12:47 AM, Zheng Da<[email protected]> 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 >> [email protected] >> 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 Thanks Vladimir. initcall_debug can show me which initcalls use most of time. but the initcall tracer has already been abandoned. I use v2.6.38. If I enable the function tracer, then it generates too much data, and the old data is overwritten. Is function tracer or function graph tracer available for tracing initcalls?
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