hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I3ZN3O
CVE: NA

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We first kill the process from the low priority memcg if OOM occurs.
If the process is not found, then fallback to normal handle.
Signed-off-by: NJing Xiangfeng <jingxiangfeng@huawei.com>
Reviewed-by: NLiu Shixin <liushixin2@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>