memcg: Modify memory.high_async_ratio changing scope

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


CVE: NA

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This patch changes HIGH_ASYNC_RATIO_BASE from 10 to 100 and changes
HIGH_ASYNC_RATIO_GAP from 1 to 10.
After this patch, user can set high_async_ratio from 0 to 99, which will
make memcg async reclaim more delicacy management.
If high_async_ratio is smaller than 10, try to reclaim all the pages of the
memcg.

Signed-off-by: Lu Jialin <lujialin4@huawei.com>
Reviewed-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>