hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I4HOXK
CVE: NA

--------------------------------

Adding periodical memory reclaim support, there are three new
interfaces:

1) /proc/sys/vm/cache_reclaim_s --- used to set reclaim interval
2) /proc/sys/vm/cache_reclaim_weight --- used to calculate reclaim amount
3) /proc/sys/vm/cache_reclaim_enable --- used to switch on/off this feature
Signed-off-by: NChen Wandun <chenwandun@huawei.com>
Reviewed-by: NTong Tiangen <tongtiangen@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>