Linux and Xenomai task

Linux and Xenomai task

[Leandro Bucci]

hello, I would like confirmation to this question.  If I run a Linux
process on a certain processor # 0 and on another processor task of Xenomai
# 1, will the Xenomai tasks never interrupt the execution of the Linux task?

Re: Linux and Xenomai task

[Fino Meng]

O Wed, Mar 03, 2021 at 11:24:00AM +0100, Leandro Bucci via Xenomai wrote:
> hello, I would like confirmation to this question.  If I run a Linux
> process on a certain processor # 0 and on another processor task of Xenomai
> # 1, will the Xenomai tasks never interrupt the execution of the Linux task?

by cpu isolation , cpu affinity and irq affinity,

real-time threads are locked to its own core, should not migration, 

when u say interrupt, do u mean non-rt Linux task are interrupt by IRQ? 

BR fino 

Re: Linux and Xenomai task

[Leandro Bucci]

thanks for the reply, I mean if I have 4 real time tasks assigned to a
single core and a linux process assigned to another core, the linux process
is not interrupted right?

Il mer 3 mar 2021, 13:03 Fino Meng <fino.meng@linux.intel.com> ha scritto:

> O Wed, Mar 03, 2021 at 11:24:00AM +0100, Leandro Bucci via Xenomai wrote:
> > hello, I would like confirmation to this question.  If I run a Linux
> > process on a certain processor # 0 and on another processor task of
> Xenomai
> > # 1, will the Xenomai tasks never interrupt the execution of the Linux
> task?
>
> by cpu isolation , cpu affinity and irq affinity,
>
> real-time threads are locked to its own core, should not migration,
>
> when u say interrupt, do u mean non-rt Linux task are interrupt by IRQ?
>
> BR fino
>

Re: Linux and Xenomai task

[Fino Meng]

 Wed, Mar 03, 2021 at 01:14:42PM +0100, Leandro Bucci wrote:
> thanks for the reply, I mean if I have 4 real time tasks assigned to a
> single core and a linux process assigned to another core, the linux process
> is not interrupted right?

I think so, ftrace can show that on different cores, they are running in parallel.

but if u put all the 4 rt-threads onto one core, they cannot run in
parallel. assume all are SCHED_FIFO, higher priority thread will preempt
the lowers.

> 
> Il mer 3 mar 2021, 13:03 Fino Meng <fino.meng@linux.intel.com> ha scritto:
> 
> > O Wed, Mar 03, 2021 at 11:24:00AM +0100, Leandro Bucci via Xenomai wrote:
> > > hello, I would like confirmation to this question.  If I run a Linux
> > > process on a certain processor # 0 and on another processor task of
> > Xenomai
> > > # 1, will the Xenomai tasks never interrupt the execution of the Linux
> > task?
> >
> > by cpu isolation , cpu affinity and irq affinity,
> >
> > real-time threads are locked to its own core, should not migration,
> >
> > when u say interrupt, do u mean non-rt Linux task are interrupt by IRQ?
> >
> > BR fino
> >