QA talk:Testcase tuna cpu isolate

The user interface changed slightly upstream, but is far easier now.

[jkacur@fionn tuna]$ tuna --help

usage: tuna [-h] [-v] [-L LOG-LEVEL] [-D]

                  {isolate,include,move,spread,priority,run,save,apply,show_threads,show_irqs,show_configs,what_is,gui}
                  ...

tuna - Application Tuning Program

commands:

 {isolate,include,move,spread,priority,run,save,apply,show_threads,show_irqs,show_configs,what_is,gui}
   isolate             Move all allowed threads and IRQs away from CPU-LIST
   include             Allow all threads to run on CPU-LIST
   move                Move selected entities to CPU-LIST
   spread              Spread selected entities over CPU-LIST
   priority            Set thread scheduler tunables: POLICY and RTPRIO
   run                 Fork a new process and run the COMMAND
   save                Save kthreads sched tunables to FILENAME
   apply               Apply changes described in profile
   show_threads        Show thread list
   show_irqs           Show IRQ list
   show_configs        List preloaded profiles
   what_is             Provides help about selected entities
   gui                 Start the GUI

options:

 -h, --help            show this help message and exit
 -v, --version         show version
 -L LOG-LEVEL, --logging LOG-LEVEL
                       Log application details to file for given LOG-LEVEL
 -D, --debug           Print DEBUG level logging details to console

jkacur@fionn tuna]$ tuna isolate -h usage: tuna isolate [-h] (-c CPU-LIST | -S CPU-SOCKET-LIST | -N)

Move all allowed threads and IRQs away from CPU-LIST

options:

 -h, --help            show this help message and exit
 -c CPU-LIST, --cpus CPU-LIST
                       CPU-LIST affected by commands
 -S CPU-SOCKET-LIST, --sockets CPU-SOCKET-LIST
                       CPU-SOCKET-LIST affected by commands
 -N, --nohz_full       CPUs in nohz_full kernel command line will be affected
                       by operations

So to isolate cpu 0, do the following

[jkacur@fionn tuna]$ tuna isolate -c 0