Date: Tue, 23 Mar 2004 00:34:56 +0200
From: Micha Feigin <michf@post.tau.ac.il>
To: lkml <linux-kernel@vger.kernel.org>
Subject: Re: finding out the value of HZ from userspace
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On Sat, Mar 20, 2004 at 12:28:00PM +0100, Stefan Smietanowski wrote:
> >>>there is one. Nothing uses it
> >>>(sysconf() provides this info)
> >>
> >>Seems to me that it would be fairly trivial to modify those programs 
> >>(that should use this mechanism but don't) to use it?  So why should 
> >>they be allowed to dictate kernel behaviour?
> >
> >
> >quality of implementation; for example shell scripts that want to do
> >echo 500 > /proc/sys/foo/bar/something_in_HZ
> >...
> >or /etc/sysctl.conf or ...
> >
> 
> Then write a simple program already. How hard is it to write a program
> that does a sysconf() and returns (as ascii of course) just the
> value of HZ? Then do some trivial calculation off of that.
> 
> HZ=$(gethz)
> 
> If your 500 was 5 seconds, do
> 
> TIME=$[HZ*5]
> echo $TIME > /proc/sys/foo/bar/something_in_HZ
> 

Will this be USER_HZ or kernel HZ?
Someone earlier suggested it would be USER_HZ which would make it
pointless.

> I mean, come on.
> 
> Then you include it in the default distro of choice so that
> everybody can use it and there you are.
> 
> If someone doesn't have "gethz" then they can download it.
> 
> // Stefan
> 
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