On Fri, Jul 31, 2020 at 08:36:12AM -0700, Andi Kleen wrote: > > yep, we have a customer that needs to compare data from multiple servers > > It's also needed to correlate over different guests on the same machine. > This is an important use case.
Both these cases you want to sync up CLOCK_MONOTONIC, using walltime is just utterly misguided. What happens if the servers have (per accident or otherwise) different DST settings, or someone does a clock_setttime() for giggles. All you really want is a clock that runs at the same rate but is not subject to random jumps and user foibles.
