[LITMUS^RT] Number of Context Switch ?

[Sanjib Das]

Hi Björn,
Thanks for idea with PID. I was wondering with the generated CSVs and PLOTs
by experiment script. For each experiment with PFAIR scrip returns 3
couples of  CSVs and PDFs. Where PDFs are labeled as CXS_task_Avg_Avg,
CXS_task_Min_Min, CXS_task_Min_Avg, CXS_task_Var_Avg, CXS_task_Max_Max,
CXS_task_Max_Avg. Do they all shows the CXS time or the number of CXS also
?
I am confused cause there is not axis title.

Thanks in advance

Sanjib Das


On Sat, Jun 7, 2014 at 9:37 AM, Björn Brandenburg <bbb at mpi-sws.org> wrote:

>
> On 07 Jun 2014, at 09:19, Sanjib Das <cnt.sanjib at googlemail.com> wrote:
>
> Using ft_tools we can get the context switching time (CXS_START, CXS_END:
> Used to record the time spent to make a context switch. ), but is there any
> trick to get the number of preemption too ?
>
>
> There is one CXS_START sample per preemption, so you could just count the
> number of samples. If you want to know *which* task was preempted, you need
> to look at the sched_trace data, which contains PIDs.
>
> - Björn
>
>
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