Hi Robert.... On Tue, Dec 29, 2009 at 7:04 PM, Robert P. J. Day <[email protected]> wrote: > > i'm about to dig into some prose regarding system timers, and i'm > wondering -- before i start -- if there have been any major > developments or changes in system timers over the last few major > kernel releases, or whether i can expect older documentation on that > topic to still be relatively accurate.
I suspect, latest development on tickless kernel (especially on how it uses HPET) will moderately change the way system timer work. All I know, in general, if kernel detects nothing needs to be done up to the next tick shot (it means, a task or function asking for alarm), it will be "rounded" to the next tick and so on. Or, explicitly, certain functions (I forget their names) can be used to register a timer-based callbak in a way that it can be loosely rounded up. PS: Perhaps you might need to check in case software suspend and cpu frequency scaling also slightly change the way timer works -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to [email protected] Please read the FAQ at http://kernelnewbies.org/FAQ
