On Wed, 22 Dec 2021 08:54:00 +0800 Yanling Song <son...@ramaxel.com> wrote:
> > If all you want is jiffie accuracy, you could use > > CLOCK_MONOTONIC_COARSE. > > > I did not get your point: CLOCK_MONOTONIC is more accurate than > CLOCK_MONOTONIC_COARSE, right? CLOCK_MONOTONIC ends up using the TSC counter and values in the shared page (VDSO) to compute time accurately. CLOCK_MONOTONIC_COARSE is faster and good enough if you only want ms accuracy. It just reads a value from shared page and avoids the TSC instruction.
