On Thu, 27 Mar 2014 14:14:44 +0800 wyang <w90p710@xxxxxxxxx> wrote: > Hi guys, > > I ran into a issue that the msleep(10) does not return promptly at boot > stage, kernel would take amount of time to boot up. since I wanna trace > timer at boot stage, > so I enabled a trace event via command line such as > "trace_event=timer:*", but unfortunately the kernel did not boot > successfully, so is there any method to > dump the trace event to console while kernel cannot boot up sucessfully? > Hi, I would have replied earlier, but I was traveling when you sent this. Can you modify the kernel? If so, you can add ftrace_dump(DUMP_ALL); anywhere in the kernel. It will dump the ftrace buffer to console when it is hit. But this is a good reminder. I should add the function:dump filter ability to the command line. -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-trace-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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