Revert "add procfs interaface"

This reverts commit eca04819c63d6f476e4e8e70dace4e6edb8a64c5.
Revert "hashtable interface fixes"

This reverts commit f664c28c8e09d75b1c05a811efd78d37a54d061b.
Revert "remove reference counter, do all the stuff under rcu_read_lock/unlock"

This reverts commit 70052a46ad8742e44b7de7de05a38ccff9911b66.