on 31/03/2010 15:05 Tsuyoshi Ozawa said the following: > Thank you for replying ! > > The patch for FreeBSD 8.0 original source is here : > http://gist.github.com/350230 > If this patch cause collision, I'm going to throw patch between > FreeBSD 8.0 HEAD and my chage. (sorry for this, I cannot connect to > CVS repository now for network reason. It take a few days to connect > CVS repository.)
Thank you for this interesting and useful work! I looked through the code and here is my understanding of how it works, it coincides with how you described it, but I'd like to state it in my own words :-) 1. Instead of firing clock (LAPIC timer) interrupt regularly with a frequency derived from HZ, the interrupt is scheduled to fire (in one-shot mode) at the time of the soonest scheduled callout. 2. The code also makes sure to run hard/stat/prof-clocks if time since last interrupt is greater than their respective periods in !dyntick mode. Thus, it appears that in dyntick mode hard/stat/prof-clocks would run irregularly. I couldn't find any code that makes sure that the rest of the system handles this properly. Perhaps I missed it, or is it still in progress/plans? Also, I am not sure if the code handles the case when a new 'soonest' callout is scheduled after we already decided when to fire the next LAPIC timer interrupt. Thank you very much again! Please keep up the good work :) -- Andriy Gapon _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
