Jemalloc dirty page only use madvise MADV_FREE, memory is not release back to system, RSS won't reduce in time, So when the process memory exceed limit or system available memory is insufficient, manually transfer dirty page to the muzzy page, which will call MADV_DONTNEED to release the physical memory back to the system. https://jemalloc.net/jemalloc.3.html#opt.dirty_decay_ms