Why is memory allocation via syscalls bad? I get it for embedded (which was mentioned above so perhaps that's what this targets), but I kind of assumed malloc was a syscall underneath on an actual OS and that was fine.
Actually, you don't need to run any functions to cause a context switch. For example, at the very lowest level, even trying to access a memory page that is presently in physical memory but does not have entry in TLB causes CPU to interrupt to OS to ask for mapping.
