[PATCH testsuite] tests/task_setscheduler: add cgroup v2 case for moving proc to root cgroup

[Gong Ruiqi]

Ping.

On 2024/07/02 17:54, GONG, Ruiqi wrote:
> Currently for systems that only enable cgroup v2, the test script would
> fail to move the target process into the root cgroup since the cgroup v1
> path is used, which therefore makes the testcase fail. Add cgroup v2
> handling here so that no matter which cgroup version the CPU controller
> is bound to, the target process can always be moved to the root CPU
> cgroup.
> 
> Signed-off-by: GONG, Ruiqi <gongruiqi1 at huawei.com>
> ---
>  tests/task_setscheduler/test | 17 +++++++++++------
>  1 file changed, 11 insertions(+), 6 deletions(-)
> 
> diff --git a/tests/task_setscheduler/test b/tests/task_setscheduler/test
> index c2fe8c6..fa1efb1 100755
> --- a/tests/task_setscheduler/test
> +++ b/tests/task_setscheduler/test
> @@ -20,12 +20,17 @@ vec( $rin, fileno($f), 1 ) = 1;
>  select( $rin, undef, undef, 5 );
>  close($f);
>  
> -$cgroup_cpu = "/sys/fs/cgroup/cpu/tasks";
> -if ( -w $cgroup_cpu ) {
> -
> -    # We can only set the scheduler policy fo SCHED_{RR,FIFO} in the root
> -    # cgroup so move our target process to the root cgroup.
> -    open( my $fd, ">>", $cgroup_cpu );
> +# We can only set the scheduler policy fo SCHED_{RR,FIFO} in the root
> +# cgroup so move our target process to the root cgroup.
> +$cgroup_v1_cpu = "/sys/fs/cgroup/cpu/tasks";
> +if ( -w $cgroup_v1_cpu ) {
> +    open( my $fd, ">>", $cgroup_v1_cpu );
> +    print $fd $pid;
> +    close $fd;
> +}
> +$cgroup_v2 = "/sys/fs/cgroup/cgroup.procs";
> +if ( -w $cgroup_v2 ) {
> +    open( my $fd, ">>", $cgroup_v2 );
>      print $fd $pid;
>      close $fd;
>  }