* rtc_gettimeofday VS. do_gettimeofday @ 2004-03-06 15:27 Abhishek Rai 2004-03-11 21:54 ` George Anzinger 0 siblings, 1 reply; 2+ messages in thread From: Abhishek Rai @ 2004-03-06 15:27 UTC (permalink / raw) To: linux-kernel Hi, I need a mechanism to get accurate timeofday from inside the kernel. Though rtc_gettimeofday() and do_gettimeofday() both look appropriate, is there a reason to prefer one over the other ? Thanks !! Abhishek ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: rtc_gettimeofday VS. do_gettimeofday 2004-03-06 15:27 rtc_gettimeofday VS. do_gettimeofday Abhishek Rai @ 2004-03-11 21:54 ` George Anzinger 0 siblings, 0 replies; 2+ messages in thread From: George Anzinger @ 2004-03-11 21:54 UTC (permalink / raw) To: Abhishek Rai; +Cc: linux-kernel Abhishek Rai wrote: > Hi, > I need a mechanism to get accurate timeofday from inside the kernel. > Though rtc_gettimeofday() and do_gettimeofday() both look appropriate, is > there a reason to prefer one over the other ? Well, gettimeofday is corrected by ntp, if that matters. It also has a resolution down to the micro second. The rtc, on the other hand, is an I/O device (i.e. slower) and only goes to the second. If all you need is second resolution the faster way is to use the seconds part of xtime. This is available as CURRENT_TIME which is defined in include/linux/sched.h. -- George Anzinger george@mvista.com High-res-timers: http://sourceforge.net/projects/high-res-timers/ Preemption patch: http://www.kernel.org/pub/linux/kernel/people/rml ^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2004-03-11 21:54 UTC | newest] Thread overview: 2+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2004-03-06 15:27 rtc_gettimeofday VS. do_gettimeofday Abhishek Rai 2004-03-11 21:54 ` George Anzinger
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