Ingo Molnar wrote:
Tomorrow, uh, later today. Need some sleep now...* George Anzinger <george@mvista.com> wrote:
What I am suggesting is spliting the mark code so that it would only grap the offset (current TSC in most systems) during interrupt processing. Applying this would be done later in the thread. Since it is not applying the offset, the xtime_lock would not need to be taken.
ok, you are right, and this would be fine with me. Wanna take a shot at it? I've uploaded the -03 patch which is my most current tree. (with the do_timer() moving done already.) I've reviewed the TSC offset codepath again and i'm not sure where i got the 10 usecs from ... it's a pretty cheap codepath that can be done in the direct interrupt just fine.
Ingo, I have been looking at the code being proposed by John Stultz. It looks like it handles all the issues I am talking about here. I think it would be best to leave the RT patch as it is WRT this issue and work on getting John's patch ready for prime time as any work I would do here will just get tossed when his patch hits the steet.
Meanwhile, I will (already have) get HRT working on RT and make that available in the next few days.
-- George Anzinger george@mvista.com High-res-timers: http://sourceforge.net/projects/high-res-timers/
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