Reading debug/tracing info

[Vladimir Murzin]

On 8/20/11, esmaeil mirzaee <esmaeil.debian at gmail.com> wrote:
> Hi
>
> On Sat, Aug 20, 2011 at 12:10 PM, Prateek Sharma <prateek3.14 at gmail.com>
> wrote:
>>
>>
>> On Sat, Aug 20, 2011 at 3:20 PM, Prateek Sharma <prateek3.14 at gmail.com>
>> wrote:
>>>
>>> Hello all,
>>>     I am learning how to add static trace points via trace_events.
>>> I am seeing the trace using 'cat /sys/kernel/debug/tracing/trace' .
> I am new and I try to learn trace. Can you give me how can use trace?
>>> Naturally the tracing buffer size is limited. My question is, what is the
>>> recommended way of reading trace data?
>>> Ive looked at perf record/report, but so far, i have only managed to get
>>> aggregated statistics, or complete dumps.
>>> What i need is just  a way to collect all the trace output to one file.
>>> Basically i am using the trace events as  a souped up printk (since i
>>> need
>>> to collect large amounts of traces).
>>> Do i need to use LTTng/viewer or something for this task?
>>> Thanks!
>>
>> I've already found the solution to this, turns out there is trace_pipe as
>> well.
>> Sorry!
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>
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Hi Esmaeil!

Some good starting points for you:

[1] Documentation/ftrace.txt
[2] http://lwn.net/Articles/322666/
[3] http://lwn.net/Articles/365835/
[4] http://lwn.net/Articles/366796/
[5] http://lwn.net/Articles/370423/