Re: How to know HZ from userspace?

[Erik Tews]

On Wed, May 30, 2001 at 08:37:25PM -0300, Harald Welte wrote:
> Hi!
> 
> Is there any way to read out the compile-time HZ value of the kernel?
> 
> I had a brief look at /proc/* and didn't find anything.
> 
> The background, why it is needed:
> 
> There are certain settings, for example the icmp rate limiting values,
> which can be set using sysctl. Those setting are basically derived from
> HZ values (1*HZ, for example).
> 
> If you now want to set those values from a userspace program / script in
> a portable manner, you need to be able to find out of HZ of the currently
> running kernel.

Have a look at the source of top. There is a lib which can help you to
find out HZ by reading some files from proc.