What does mean this : kernel time sync enabled

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There was some logs in /var/log/messages:
kernel time sync enabled 4001
kernel time sync enabled 0001

I didn't find anything related these messages. What does mean the message?


Reading the ntpd source, it seems this is printed if ntpd succeeds in syncing a high-precision timer with the kernel via ntp_adjtime(). ntpd appears to treat this as a system call, but it isn't a syscall on Linux, it's implemented by glibc.

I think one would need to understand quite a lot about the internal operation of NTP and system time to fully understand this. That ends up as pretty brainy stuff which I'm not familiar with. Some possibly useful references: