Hi!
> Testcase_30 function testing mem_cgroup_force_empty_write
> function return -EBUSY,when there is a task in cgroup.
> Namely when setting memory.force_empty,it will be failed.
> However,kernel 3.16 and above do nothing,
> whatever there is a task in cgroup or not.

This has been fixed in git by:

commit 5c3635d26929a00103f70a54365229449f71a217
Author: Michal Hocko <[email protected]>
Date:   Thu May 14 16:24:38 2015 +0200

    controllers/memcg: fix force_empty

    testcase_29 and testcase_30 are no longer testing anything because
    the kernel allows to use force_empty even for memcgs with active
    tasks since f61c42a7d911 ("memcg: remove tasks/children test from
    mem_cgroup_force_empty()) kernel commit.

    If we really want to test this functionality then just expect the
    success for regular mmap and expect the failure when the charged
    memory is mlocked.

    Signed-off-by: Michal Hocko <[email protected]>
    Signed-off-by: Cyril Hrubis <[email protected]>


-- 
Cyril Hrubis
[email protected]

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