Re: How to know HZ from userspace?

[Tomas Telensky]

> On Wed, Jun 06, 2001 at 08:09:33PM +0200, Tomas Telensky wrote:
> > > Hi!
> > > 
> > > Is there any way to read out the compile-time HZ value of the kernel?
> > 
> > Why simply #include <asm/param.h>?
> 
> because the include file doesn't say anything about the HZ value of 
> the currently running kernel, but only about some kernel source somewhere
> on your harddrive?

This _SHOULD_ correspond on each linux instalation. But if you would
distribute a binary to other people it's a problem.

(note that I'm running an rc script, which sets the symlink /usr/src/linux
properly at boottime ... this should be everywhere)

There is also one way how to guess HZ - calibrate :-)))
Recently I've done more difficult thing - I not only guess the HZ value, I
also guess the time when the tick comes. But it uses a bit of statistics and 
may be inaccurate on loaded systems. And you need TSC :-)

	Tomas