hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4IMAK
CVE: NA

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

Enable memcg async reclaim when memcg usage is larger than memory_high *
memcg->high_async_ratio / 10; if memcg usage is larger than memory_high *
(memcg->high_async_ratio - 1)/ 10, the reclaim pages is the diff of
memcg usage and memory_high * (memcg->high_async_ratio - 1)/ 10;
else reclaim pages is MEMCG_CHARGE_BATCH;
The default memcg->high_async_ratio is 0; when memcg->high_async_ratio
is 0, memcg async reclaim is disabled;

The situation when enable memcg async reclaim is
1) try_charge;
2) reset memory_high
Signed-off-by: NLu Jialin <lujialin4@huawei.com>
Reviewed-by: NXiu Jianfeng <xiujianfeng@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>