periodically save current time to time-of-day hardware

[Andriy Gapon]

on 06/04/2010 15:47 Andriy Gapon said the following:
> on 30/03/2010 19:43 Andriy Gapon said the following:
>> do you think that periodic saving of system clock to hardware and making resettodr
>> asynchronous are dependent issues?  Or are they orthogonal and can be implemented
>> independently?
> 
> A new version of the patch:
> http://people.freebsd.org/~avg/periodic_resettodr.diff

Given total lack of reviews and comments I am keeping this patch for my local use.

> Some notes:
> - this patch doesn't implement any resettodr enhancements proposed earlier: making
> it non-blocking/asynchronous and saving time closer to seconds boundary;
> - the patch adds code for saving time on shutdown, adds logic for checking ntp
> synchronization status and for dynamically stoping/(re-)starting the callout via
> period sysctl;
> - the patch consists of two pieces: the first is abstracting ntp status check into
> a separate function and the other is all the time saving code;
> - I don't feel that kern_ntptime.c is best place for this code, I only chose it
> because of ntp status checking; perhaps ntp_is_time_error needs to be made public
> and the code moved to a better file; suggestion are welcome!
> 
> I also welcome any comments and suggestions on code style, identifier naming,
> logic, strategy, etc.
> Thank you!
> 
> P.S. it seems that machdep is not the best place for "RTC" sysctls, but I am
> deferring this issue at the moment.
> 


-- 
Andriy Gapon