Question Regarding isolcpus

[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Hi All,

I have a question regarding the isolcpus parameter.  I've been seeing 
this parameter commonly used. However, in the kernel.org 
documentation[0], isolcpus is listed as depreciated.

Is it the case that isolcpus should not be used at all?  I've seen it 
used in conjunction with taskset.  However, should we now be telling rt 
users to use only cpusets in cgroups?  I see that CPUAffinity can be set 
in /etc/systemd/system.conf.  Is that the preferred method, so the 
process scheduler will automatically migrate processes between the 
cpusets in the cgroup cpuset or the list set by CPUAffinity?

I'm sure there are some presentations or papers on this, so I'll dig 
around as well :-)

Thanks,

Joe


[0] 
https://www.kernel.org/doc/html/v5.15/admin-guide/kernel-parameters.html#:~:text=Deprecated%20%2D%20use%20cpusets%20instead