[LTP] [PATCH v3 18/18] controllers: update cgroup_regression_test to use newer cgroup lib

[Li Wang]

On Fri, Jul 22, 2022 at 4:53 AM Luke Nowakowski-Krijger <
luke.nowakowskikrijger@canonical.com> wrote:

> The older function in the cgroup lib 'get_cgroup_mountpoint' has been
> removed, so instead replace it with its old functionaility to get
> mountpoint.
>
> Also use the newer cgroup lib require operation to mount and cleanup a
> cpu controller.
>
> Signed-off-by: Luke Nowakowski-Krijger <
> luke.nowakowskikrijger@canonical.com>
> ---
> v2: Use cgroup_require "$subsys" instead of manual greping the path
> v3: fixed bug where the ouput of cgroup_get_mountpoint wasnt being
> captured
>
>  .../cgroup/cgroup_regression_test.sh          | 31 ++++++-------------
>  1 file changed, 9 insertions(+), 22 deletions(-)
>
> diff --git a/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh
> b/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh
> index 69b51773c..bfa9097ec 100755
> --- a/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh
> +++ b/testcases/kernel/controllers/cgroup/cgroup_regression_test.sh
>

This patch itself looks good.

Note:

But I got one failure from test7 that was caused by randomly picking up
'rdma' ctrl to test.

tst_cgroup.c:820: TBROK: 'rdma' controller is unknown to LTP
cgroup_regression_test 7 TBROK: cgroup_require: No state was set after call
to tst_cgctl require?

  # cat -n cgroup_regression_test.sh

   359 test7()
   360 {
                  ...
   371        subsys=`tail -n 1 /proc/cgroups | awk '{ print $1 }'`

   379 }

Because on my aarch64 (Cgroup V2) test box, the last one in /proc/cgroups:

# cat /proc/cgroups
#subsys_name hierarchy num_cgroups enabled
cpuset 3 3 1
cpu 2 82 1
cpuacct 2 82 1
blkio 9 82 1
memory 12 288 1
devices 4 82 1
freezer 11 3 1
net_cls 6 3 1
perf_event 8 3 1
net_prio 6 3 1
hugetlb 10 3 1
pids 5 110 1
rdma 7 1 1


Anyway, we can fix this by picking a supported cgroup ctrl in a separate
patch.


-- 
Regards,
Li Wang
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