I think syscalls are not as slow as many people imagine they are, especially with modern CPUs and kernels (there are special instruction for syscalls that are f

I think syscalls are not as slow as many people imagine they are, especially with modern CPUs and kernels (there are special instruction for syscalls that are faster than the old "interrupt" approach). See here: http://pzemtsov.github.io/2017/07/23/the-slow-currenttimemillis.html http://pzemtsov.github.io/2017/07/23/the-slow-currenttimemil... ("Off-topic: A system call"). But they will be slow with this mitigation.