Messages in this thread | | | Date | Thu, 27 Jan 2005 12:53:34 -0800 | From | George Anzinger <> | Subject | Re: [PATCH] to fix xtime lock for in the RT kernel patch |
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George Anzinger wrote: > Ingo Molnar wrote: > >> * 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. >> > Tomorrow, uh, later today. Need some sleep now...
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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