On Fri, Jan 24, 2020 at 11:46:53AM -0500, Waiman Long wrote: > I also thought about that. As you said, it can be hard to guarantee that > reliable time value can be retrieved in a timely manner across all the > archs. Rememer that this code is limited to 64bit archs that have NUMA, my quick grep says that is limited to: alpha, arm64, ia64, mips, powerpc, s390, sparc, x86 afaict, x86 is the one with the worst clocks between the lot of them (with exception of ia64, which has been completely buggered for a while and nobody cares). > Even if we can do that, we will introduce latency to important > tasks or contexts. I like the first approach better. In general, the kernel has no clues what is actually important.
