Correct me if I'm wrong Linux only supports KSM (memory-deduping) between processes when doing it between VMs, as QEMU provides information to the kernel to perform it.
> KSM was originally developed for use with KVM (where it was known as Kernel Shared Memory), to fit more virtual machines into physical memory, by sharing the data common between them. But it can be useful to any application which generates many instances of the same data
Although...
> KSM only operates on those areas of address space which an application has advised to be likely candidates for merging, by using the madvise(2) system call
1. You need a much better newer systemd than your distro likely packages.
2. KSM dedupe scans aren't free. Your system can spend its time doing that scan or it can spend its doing work with duplicate pages. Only relatively idle or highly homogenous systems would be free of the penalty.
3. For applications, especially statically linked ones, the duplicated code is not super likely to fall along page boundaries, thus the actual detectable duplication will be relatively low.
That said, it's still great for densely deploying a high traffic microservice that's more memory than CPU bound.