[LITMUS^RT] Question about using ft -- Sisu

[Sisu Xi]

Hi, Jonathan:

Yes. This solves the problem. Thanks very much!

Sisu


On Wed, Apr 17, 2013 at 12:41 PM, Jonathan Herman <hermanjl at cs.unc.edu>wrote:

> Hi Sisu,
>
> You need to give the full path to the device and not just the name.
> Example: 'sudo ftcat /dev/litmus/ft_trace0 SCHED RELEASE'. See 'ls
> /dev/litmus' for all the tracing devices. There is one sched_trace device
> per CPU, and one ft_trace device shared amongst all CPUs.
>
>
> On Wed, Apr 17, 2013 at 12:24 PM, Sisu Xi <xisisu at gmail.com> wrote:
>
>> Hi, litmus developers:
>>
>> sorry to bother you again. I recompile the kernel and still get this
>> message.
>>
>> xisisu at litmus1:~/ft_tools$ sudo ftcat ft_trace SCHED_START SCHED_END >
>> ../temp.out
>>  Error: could not open feathertrace device (ft_trace): No such file or
>> directory
>> Usage: ftcat [OPTIONS] <ft device> TS1 TS2 ....
>>
>> Options:
>>    -s SIZE   --  stop tracing afer recording SIZE bytes
>>
>>
>> However, I was able to get the log file working
>> xisisu at litmus1:~/ft_tools$ sudo cat /dev/litmus/log > ../temp.out
>> ^Cxisisu at litmus1:~/ft_tools$ head ../temp.out
>> 50368 P0: check_for_preemptions: attempting to link task 1081 to 3
>> 50369 P0: P0 is closest available CPU to P0
>> 50370 P0: (swapper/0:0) will be preempted by base_task/1081
>> 50371 P0: (base_task/1081:4579) scheduled_on = P0
>> 50372 P0: (base_task/1081:4579) arming enforcement timer.
>> 50373 P0: gsnedf_scheduler_tick: 1081 is preemptable  => FORCE_RESCHED
>> 50374 P0: enforcement timer fired.
>> 50375 P0: (base_task/1081:4579) blocks:0 out_of_time:1 np:0 sleep:0
>> preempt:0 state:0 sig:0
>> 50376 P0: (base_task/1081:4579) job_completion().
>>
>>
>>
>> This is my config file
>>
>> xisisu at litmus1:~/litmus-rt$ tail .config
>> # Tracing
>> #
>> CONFIG_FEATHER_TRACE=y
>> CONFIG_SCHED_TASK_TRACE=y
>> CONFIG_SCHED_TASK_TRACE_SHIFT=9
>> CONFIG_SCHED_LITMUS_TRACEPOINT=y
>> CONFIG_SCHED_OVERHEAD_TRACE=y
>> CONFIG_SCHED_DEBUG_TRACE=y
>> CONFIG_SCHED_DEBUG_TRACE_SHIFT=18
>> # CONFIG_SCHED_DEBUG_TRACE_CALLER is not set
>>
>>
>> any hint about this?
>>
>> Thanks very much!
>>
>> Sisu
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> On Tue, Apr 16, 2013 at 2:58 PM, Sisu Xi <xisisu at gmail.com> wrote:
>>
>>> I just checked my
>>> # CONFIG_SCHED_OVERHEAD_TRACE is not set
>>> is not set..
>>>
>>> I'll recompile the kernel with this enabled.
>>>
>>> thanks all the same.
>>>
>>> sisu
>>>
>>>
>>> On Tue, Apr 16, 2013 at 2:22 PM, Sisu Xi <xisisu at gmail.com> wrote:
>>>
>>>> Hi, all:
>>>>
>>>> I installed the litmus-rt within a guest VM using Xen hypervisor. I can
>>>> run base_task without problem, and also I can check the /dev/litmus/log
>>>> files. However, when I try to use the ft_tools, it gives the following
>>>> errors. Does anyone know why?
>>>>
>>>> xisisu at litmus1:~/ft_tools$ sudo ./st_trace global-exp
>>>> CPU 0: 1081 > st-global-exp-0.bin [0]
>>>> Press Enter to end tracing...
>>>>
>>>> Ending Trace...
>>>> Disabling 10 events.
>>>> [  259.507087] Failed trace writes: 0
>>>> /dev/litmus/sched_trace0: 10176 bytes read.
>>>> xisisu at litmus1:~/ft_tools$ cat /dev/litmus/sched_trace0
>>>> cat: /dev/litmus/sched_trace0: Permission denied
>>>> xisisu at litmus1:~/ft_tools$ sudo cat /dev/litmus/sched_trace0
>>>> [  278.522061] Failed trace writes: 0
>>>>
>>>> xisisu at litmus1:~/ft_tools$ sudo ./ftcat ft_trace CXS_START CXS_END >
>>>> ../temp.out
>>>> Error: could not open feathertrace device (ft_trace): No such file or
>>>> directory
>>>> Usage: ftcat [OPTIONS] <ft device> TS1 TS2 ....
>>>>
>>>> Options:
>>>>    -s SIZE   --  stop tracing afer recording SIZE bytes
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>  I am running it on a intel i7 machine, with hyperthreading disabled.
>>>> Kernel is configured following the instruction on your website. Seems
>>>> litmus is compatible with the xen guest patch. My host runs a normal linux
>>>> kernel, 3.4.35 on CentOS 6.3, and my guest VM is Ubuntu 12.04,
>>>> para-virtualized.
>>>>
>>>> Thanks very much!
>>>>
>>>> Sisu
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Sisu Xi, PhD Candidate
>>>>
>>>> http://www.cse.wustl.edu/~xis/
>>>> Department of Computer Science and Engineering
>>>> Campus Box 1045
>>>> Washington University in St. Louis
>>>> One Brookings Drive
>>>> St. Louis, MO 63130
>>>>
>>>
>>>
>>>
>>> --
>>> Sisu Xi, PhD Candidate
>>>
>>> http://www.cse.wustl.edu/~xis/
>>> Department of Computer Science and Engineering
>>> Campus Box 1045
>>> Washington University in St. Louis
>>> One Brookings Drive
>>> St. Louis, MO 63130
>>>
>>
>>
>>
>> --
>> Sisu Xi, PhD Candidate
>>
>> http://www.cse.wustl.edu/~xis/
>> Department of Computer Science and Engineering
>> Campus Box 1045
>> Washington University in St. Louis
>> One Brookings Drive
>> St. Louis, MO 63130
>>
>> _______________________________________________
>> litmus-dev mailing list
>> litmus-dev at lists.litmus-rt.org
>> https://lists.litmus-rt.org/listinfo/litmus-dev
>>
>>
>
>
> --
> Jonathan Herman
> Department of Computer Science at UNC Chapel Hill
>
> _______________________________________________
> litmus-dev mailing list
> litmus-dev at lists.litmus-rt.org
> https://lists.litmus-rt.org/listinfo/litmus-dev
>
>


-- 
Sisu Xi, PhD Candidate

http://www.cse.wustl.edu/~xis/
Department of Computer Science and Engineering
Campus Box 1045
Washington University in St. Louis
One Brookings Drive
St. Louis, MO 63130
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