[LITMUS^RT] litmus-dev Digest, Vol 31, Issue 3

[Chandrasekaran Sivakumar]

Hi Kushal,
I got the same issue some time back. I suggest installing Ubuntu 12.04 if
you have not solved the problem already. As Bj?rn had said, Ubuntu 13.04
distro is not creating the trace devices properly..
Hope this helps!

Regards,
chandru


On Mon, Jul 7, 2014 at 6:00 PM, <litmus-dev-request at lists.litmus-rt.org>
wrote:

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>    1. [Fwd: Re: log and feather trace missing from dev/litmus]
>       (Kushal Srivastava)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 6 Jul 2014 23:36:31 +0530
> From: "Kushal Srivastava" <s.kushal at iitg.ernet.in>
> To: litmus-dev at lists.litmus-rt.org
> Subject: [LITMUS^RT] [Fwd: Re: log and feather trace missing from
>         dev/litmus]
> Message-ID:
>         <8b9cb1d4afe6024779a672da5b5c18cd.squirrel at webmail.iitg.ernet.in>
> Content-Type: text/plain; charset="iso-8859-1"
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> ---------------------------- Original Message ----------------------------
> Subject: Re: [LITMUS^RT]  log and feather trace missing from dev/litmus
> From:    Bj?rn Brandenburg <bbb at mpi-sws.org>
> Date:    Wed, June 25, 2014 4:24 pm
> To:      s.kushal at iitg.ernet.in
>          litmus-dev at lists.litmus-rt.org
> --------------------------------------------------------------------------
>
>
> On 24 Jun 2014, at 11:52, Kushal Srivastava <s.kushal at iitg.ernet.in>
> wrote:
>
> > Hi Bjorn,
> >> as per your advice i'm sending you the output of li -l /dev/litmus/
> >> which is
> >> root at leonidas:/# ls -l /dev/litmus/
> >> total 0
> >> crw------- 1 root root 10, 61 Jun 24 07:04 ctrl
> >> crw-rw-rw- 1 root root 10, 60 Jun 24 07:04 uncache
> >>
> >>
> >> also the output of dmesg as recorded is enclosed as txt file here.
> >> Also i am current distribution is 13.04 .
> >> the output was as:
> >> Distributor ID:        Ubuntu
> >> Description:        Ubuntu 13.04
> >> Release:        13.04
> >> Codename:        raring
> >>
> >>
> >>
> >> <dmesg>
>
>
> I would have expected error messages in the logs ("Could not register
> per-cpu ft_trace device" and "Could not register message ft_trace
> device").
>
>
> https://github.com/LITMUS-RT/litmus-rt/blob/master/litmus/trace.c#L500
>
>
> https://github.com/LITMUS-RT/litmus-rt/blob/master/litmus/trace.c#L531
>
> It appears that the devices are correctly being registered. This seems to
> indicate that udev might not create the device nodes due to whatever
> policy it is using in your distribution, which is really outside of our
> control.
>
> Just to check, can you please post the output of:
>
>         cat /proc/devices
>
> - Bj?rn
>
>
>
> hi  Bj?rn
>
> How can i trace the scheduling being done by the plugin without these tools
> I am attaching the output of /proc/devices
> as you had asked for it.
> What should be done to resolve the issue.
> how should the feather trace device node be created using the udev .
> would you suggest reinstalling the kernel and litmus-rt again along with
> the feather trace tools.
>
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