On 2015/1/26 23:22, Cyril Hrubis wrote:
> Hi!
>> For kernel commit c4c27fbdda4e8ba87806c415b6d15266b07bce4b,
>> disallow attaching kthreadd or PF_THREAD_BOUND threads to cgroups.
>>
>> So, we kindly avoid to attach these threads in cgroup tests.
>
> What happens when we try that out? Can you include the error message (if
> any)?
>
>> Signed-off-by: Li Jinyue <lijin...@huawei.com>
>> ---
>> testcases/kernel/controllers/cgroup_fj/cgroup_fj_function.sh | 10 ++++++++++
>> 1 file changed, 10 insertions(+)
>>
>> diff --git a/testcases/kernel/controllers/cgroup_fj/cgroup_fj_function.sh
>> b/testcases/kernel/controllers/cgroup_fj/cgroup_fj_function.sh
>> index 30476bd..30fffb6 100755
>> --- a/testcases/kernel/controllers/cgroup_fj/cgroup_fj_function.sh
>> +++ b/testcases/kernel/controllers/cgroup_fj/cgroup_fj_function.sh
>> @@ -186,6 +186,16 @@ case $attach_operation in
>> do
>> cur_pid=`sed -n "$i""p" $TMPFILE`
>> if [ -e /proc/$cur_pid/ ];then
>> + #For kernel 3.4.0 and higher,kernel disallow attaching
>> kthreadd or
>> + #PF_THREAD_BOUND threads to cgroups.
>> + #kernel commit: c4c27fbdda4e8ba87806c415b6d15266b07bce4b
>> + tst_kvercmp 3 4 0
>> + if [ $? -ne 0 ]; then
>> + thread_flag=`cat /proc/$cur_pid/stat | awk
>> '{print $9}'`
>
> Why not just thread_flag=$(awk '{print $9}'/proc/$cur_pid/stat) ?
>
>> + if [ $cur_pid -eq 2 -o
>> $((${thread_flag}&0x04000000)) -eq 67108864 ];then
>
> So you are relying on fact that kthreadadd pid is 2. Is that specified
> somewhere? I doubt that this will hold forever.
>
> Also the magical constant 67108864 is very cryptic, what about using
> -ne 0 instead -eq 67108864?
>
Hi,
Thanks for the suggestions! I'll attach the error message and post a new one.
Regards,
Li Jinyue
lijin...@huawei.com
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