Date: Fri, 20 Aug 2010 10:14:23 -0300 From: Jesse Smith <jessefrgsmith@yahoo.ca> To: freebsd-hackers@freebsd.org Subject: Converting from jiffies to ticks Message-ID: <1282310063.2601.9.camel@hp-laptop>
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I am currently trying to port a program from Linux to FreeBSD which detects how much processor time a process is using. The native Linux code does this (in part) by reading the number of "jiffies" a given process uses. This info is pulled from the /proc/PID/stat file. One function is failing on FreeBSD and it's obviously because FreeBSD does not have all the same files/data in the /proc directory. I've looked around and, as I understand it, FreeBSD uses "ticks" instead of "jiffies" to measure process usage. However, how to gather that data is a bit lost on me. This raises a question for me: Where can I find the equivalent information on FreeBSD? I assume there's a function call. Maybe in the kvm_* family? I need to be able to get the number of ticks a given PID is using, both in the kernel and userspace. The rest of the program measures everything in "jiffies", so it would be ideal for me to get the ticks used on FreeBSD (based on PID), convert it to "jiffies" and pass it back to the main program. Thanks for any advice, Jesse
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