[SAFS]: print error when no page can be evicted.
[SAFS]: print error when no page can be evicted.

silky/FlashGraph,zheng-da/FlashX,icoming/FlashGraph,zheng-da/FlashX,icoming/FlashX,icoming/FlashX,silky/FlashGraph,flashxio/FlashX,icoming/FlashX,flashxio/FlashX,zheng-da/FlashX,flashxio/FlashX,zheng-da/FlashX,zheng-da/FlashX,icoming/FlashGraph,icoming/FlashX,silky/FlashGraph,flashxio/FlashX,icoming/FlashGraph,flashxio/FlashX,silky/FlashGraph,flashxio/FlashX,icoming/FlashGraph,icoming/FlashX,icoming/FlashGraph,silky/FlashGraph