Messages in this thread | | | Date | Fri, 24 Aug 2007 01:43:30 +0200 | From | Luka Napotnik <> | Subject | division and cpu usage |
| |
Hello.
I'm new to kernel development and have some questions.
1. Why can't I divide with regular casting to double ((double)a / (double)b)? It gives me strange errors when compiling:
WARNING: "__divdf3" [/root....] undefined! WARNING: "__addf3" [/root/...] undefined! WARNING: "__floatsidf" [/root/...] undefined!
And if I compile with normal integers, I get zero as the result.
2. I'm trying to get the percentage of CPU used for a certain task_struct and figured the following formula:
(task->utime + task->stime) / jiffies
Before calculating I convert all the variables to jiffies. Is this correct?
Please help.
Greets, Lukla - 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/
| |