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Date: Tue, 14 Nov 2006 02:50:57 +0100 From: Andi Kleen <ak@...e.de> To: Suleiman Souhlal <ssouhlal@...ebsd.org> Cc: Linux Kernel ML <linux-kernel@...r.kernel.org>, vojtech@...e.cz, Jiri Bohac <jbohac@...e.cz> Subject: Re: [PATCH 0/2] Make the TSC safe to be used by gettimeofday(). On Tuesday 14 November 2006 02:06, Suleiman Souhlal wrote: > I've had a proof-of-concept for this since August, and finally got around to > somewhat cleaning it up. Thanks. I got a competing implementation for this unfortunately now from Vojtech & Jiri Yours is simpler, but I'm not sure as complete. What are your assurances against non monoticity for example? > > It can certainly still be improved, namely by using vgetcpu() instead of CPUID > to find the cpu number (but I couldn't get it to work, when I tried). What did not work? > Another possible improvement would be to use RDTSCP when available. > There's also a small race in do_gettimeofday(), vgettimeofday() and > vmonotonic_clock() but I've never seen it happen. I did a vposix_getclock with monotonic clock support on my own already, was about to be merged with the vDSO. It still used global synchronized TSC though. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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