Revert "When kswapd is awoken due to reclaim by a running task, set the priority of"

This reverts commit acc8aab1faf8c3151854998455e47060ca5172cd.
Revert "drop caches more agressively"

This reverts commit 544dfb4aeb7f480c0436c2115c9c9782fa5f0f8a.