On Tue, Jun 11, 2019 at 11:09:20PM +0200, Thomas Gleixner wrote: > Jason, > > On Fri, 7 Jun 2019, Jason A. Donenfeld wrote: > > Adding a few more people on cc and keeping full context. > > > Hey Thomas, > > > > After some discussions here prior about the different clocks > > available, WireGuard uses ktime_get_boot_fast_ns() pretty extensively. > > The requirement is for a quasi-accurate monotonic counter that takes > > into account sleep time, and this seems to fit the bill pretty well.
How quasi? Do the comments in kernel/sched/clock.c look like something you could use? As already mentioned in the other tasks, anything ktime will be horrifically crap when it ends up using the HPET, the code in kernel/sched/clock.c is a best effort to keep using TSC even when it is deemed unusable for timekeeping.
