Messages in this thread | | | Date | Thu, 29 Aug 2013 20:42:08 +0530 | Subject | Re: wakeup tracer not able to capture traces on 3.4 kernel | From | Prabhat Kumar Ravi <> |
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On Thu, Aug 29, 2013 at 7:41 PM, Prabhat Kumar Ravi <prabhatravi09@gmail.com> wrote: > Hi, > > I trying to capture traces through wakeup tracer, but not able to > capture it on 3.4 kernel with cortex A9 processor, armv7. > {{{ > / # mount -t debugfs nodev /debug > / # sysctl kernel.ftrace_enabled=1 > kernel.ftrace_enabled = 1 > / # echo wakeup > /debug/tracing/current_tracer > / # echo latency-format > /debug/tracing/trace_options > / # echo 0 > /debug/tracing/tracing_max_latency > / # echo 1 > /debug/tracing/tracing_on > / # sleep 10 > / # echo 0 > /debug/tracing/tracing_on > / # cat /debug/tracing/trace > # tracer: wakeup > # > }}}
My target board is xilinx-zc702, here in kernel/trace/trace.c: void tracing_record_cmdline(struct task_struct *tsk) { if (atomic_read(&trace_record_cmdline_disabled) || !tracer_enabled || !tracing_is_on()) -------------------------------> it not coming here at all. return;
trace_save_cmdline(tsk); }
Regards, Prabhat
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