read/write periodically

Signed-off-by: Kohei Takahashi <flast@flast.jp>
Fix early escaping

  * cased by e790c290a8d9696addc54d554d42c8c59721296e

Signed-off-by: Kohei Takahashi <flast@flast.jp>
Aggressive scan more and more

Signed-off-by: Kohei Takahashi <flast@flast.jp>