On Fri, 4 Jul 2025, Ahmed S. Darwish wrote: > The cyclictest's manpage references CLOCK_MONOTONIC and CLOCK_REALTIME > multiple times without providing a relevant description or reference. > > Reference clock_getres(2) where such clocks are extensively described. > > Pick the Linux version, instead of the POSIX (3p) one, as the former has > details that are relevant to cyclictest's "--secaligned" implementation; > i.e., Linux's CLOCK_MONOTONIC starts from 0. > > Signed-off-by: Ahmed S. Darwish <darwi@xxxxxxxxxxxxx> > --- > src/cyclictest/cyclictest.8 | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/src/cyclictest/cyclictest.8 b/src/cyclictest/cyclictest.8 > index 6982234..12fb9c1 100644 > --- a/src/cyclictest/cyclictest.8 > +++ b/src/cyclictest/cyclictest.8 > @@ -100,11 +100,15 @@ Obsolete option. Please use \-\-default\-system instead. > . > .TP > .B \-c, \-\-clock=CLOCK > -select clock > +Select the system clock to be used for calculating the measuring thread's > +latency. Allowed CLOCK values are: > .br > 0 = CLOCK_MONOTONIC (default) > .br > 1 = CLOCK_REALTIME > +.br > +For more information on the Linux implementation of such clocks, check > +.MR clock_getres 2 > . > .TP > .B \-x, \-\-posix_timers > -- > 2.49.0 > > > Signed-off-by: John Kacur <jkacur@xxxxxxxxxx>
