On 04/10/2014 10:44 PM, Steven Rostedt wrote:
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.
Steve,Thanks for your response, I could modify my kernel, I would try it. Thank you again.
Wei
But this is a good reminder. I should add the function:dump filter ability to the command line. -- Steve
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