Messages in this thread | | | Date | Tue, 15 Nov 2005 10:58:34 -0800 | From | George Anzinger <> | Subject | Re: Timer idea |
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evan@coolrunningconcepts.com wrote: > I was thinking about benchmarking, profiling, and various other applications > that might need frequent access to the current time. Polling timers or > frequent timer signal delivery both seem like there would be a lot of overhead. > I was thinking it would be nice if you could just read the time information > without making an OS call. > > I figure the kernel keeps accurate records of current time information and the > values of various timers. I then had the idea that one could have a /dev or > maybe a /proc entry that would allow you to mmap() the kernel records (read > only) and then you could read this information right from the kernel without > any overhead. >
Your are describing the vsyscall. John Stultz and company are actively working on this as we speak. If memory serves, it is already available on some platforms.
-- George Anzinger george@mvista.com HRT (High-res-timers): http://sourceforge.net/projects/high-res-timers/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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