Ok, in the kernel, no problem :) I'd like to get some time that tasks take, e.g.: cpu execution time, how much time a process, already ready, waits to be executed and so on On 6/16/05, Nish Aravamudan <nish.aravamudan@xxxxxxxxx> wrote: > On 6/16/05, Arlen Nascimento <arlen.nascimento@xxxxxxxxx> wrote: > > How can I measure 1 second into kernel? > > I assume you mean "in the" not "into"? Measuring "into" is a bit > tricker, I think. If you want to measure 1 second in the kernel, the > first question is why? 1 second is a *long* time. > > > Does one jiffie really corresponds to 1/100 seconds?? is it right? > > It depends on HZ. And ACTHZ. A jiffy is defined to be 1/HZ seconds in > duration, sort of. Really, the kernel requests HZ to the hardware and > gets ACTHZ, which you'll notice is actually less than the request. > Thus, you get rounding compensation in functions like sys_nanosleep() > where 2 jiffies (or 2 milliseconds) are added to each request in 2.6. > > What exactly are you trying to do? > > Thanks, > Nish > -- Arlen Nascimento -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
