Device Drivers ---> [*] Block devices ---> [BLK_DEV] <*/M> RAM block device support [BLK_DEV_RAM] [*] Multiple devices driver support (RAID and LVM) ---> [MD] <*/M> Device mapper support [BLK_DEV_DM] <*/M> Crypt target support [DM_CRYPT] <*/M> Snapshot target [DM_SNAPSHOT] <*/M> Thin provisioning target [DM_THIN_PROVISIONING] <*/M> Cache target (EXPERIMENTAL) [DM_CACHE] <*/M> Mirror target [DM_MIRROR] <*/M> Zero target [DM_ZERO] <*/M> I/O delaying target [DM_DELAY] Kernel hacking ---> Generic Kernel Debugging Instruments ---> [*] Magic SysRq key [MAGIC_SYSRQ]