When we experience a early boot crash, we are not able to analyze the kernel dump, as user-space wasn't able to load the crash system. The idea is to make the crash system compiled into the host kernel (think of initramfs) so that we can create a kernel dump really early in the boot process.
zswap  is a linux kernel component that provides in-memory compression for swap pages. It already provides a limited form of deduplication: if a page is filled with the same value (e.g. all-zeroes) then only that value is kept instead of compressing the contents.
The keys in db or mok can be used to verify boot loader and kernel binary for booting. But upstream kernel doesn't trust them for enrolling to trusted keyring because they are enrolled outside the boundaries of kernel. Which means that IMA can not use db/mok keys for verification.
Nanos is a "unikernel" providing a subset of Linux kernel features. It only allows a single process to run, but has multiple threads. It maintains the kernel-land to user-land boundary unlike other unikernels (so perhaps isn't strictly a unikernel).