linux-kernel - Re: wakeup tracer not able to capture traces on 3.4 kernel

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Message-ID: <CAJ_BOiCV50yzx4WhW=wVzNmq3PoZRP0e7Qqb5byGiG53tr0JVg@mail.gmail.com>
Date:	Fri, 30 Aug 2013 21:29:09 +0530
From:	Prabhat Kumar Ravi <prabhatravi09@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: wakeup tracer not able to capture traces on 3.4 kernel

Thanks to all, I got solution, this issue is due to lack of proper
timer implementation.

On Thu, Aug 29, 2013 at 8:42 PM, Prabhat Kumar Ravi
<prabhatravi09@...il.com> wrote:
> On Thu, Aug 29, 2013 at 7:41 PM, Prabhat Kumar Ravi
> <prabhatravi09@...il.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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