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

[Sisu Xi]

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.litmus-rt.org/pipermail/litmus-dev/attachments/20130416/bc3d6d41/attachment.html>