!3701 mm: Add sysctl to clear free list pages

Merge Pull Request from: @ci-robot 
 
PR sync from: Yu Liao <liaoyu15@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/NTM2QZ4LH7HMKTM4R6D5XYS3JUWIXVRL/ 
 
https://gitee.com/openeuler/kernel/issues/I8MK3O 
 
Link:https://gitee.com/openeuler/kernel/pulls/3701

 

Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>