Re: [RFC][PATCH] new timeofday core subsystem (v.A0)

Andi Kleen
2004-09-15T09:14:46Z

> I really think a tickless system, for other than UML systems, is a loosing
> thing. The accounting overhead on context switch (which increases as the

You can run the accounting independently at much lower frequency (10ms is
perfectly fine as 2.4 has proven - i suspect even lower would be ok too)
IMHO it should be a sysctl so that users can do a trade off between
power consumption and accounting accuracy.

And there is one important special that doesn't need any accounting
for user space at all: the idle loop.
It still needs some way to account interrupts, but that could be done
in do_IRQ or also do with rather low frequency.

-Andi