linux-kernel - Re: HZ from userspace

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Message-ID: <2c0942db0808061449s48ba235cy1b5672c0952b8fdf@mail.gmail.com>
Date:	Wed, 6 Aug 2008 14:49:49 -0700
From:	"Ray Lee" <ray-lk@...rabbit.org>
To:	"Piotr Jaroszyński" <p.jaroszynski@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: HZ from userspace

On Wed, Aug 6, 2008 at 1:48 PM, Piotr Jaroszyński
<p.jaroszynski@...il.com> wrote:
> Hello,
>
> I want to be able to convert starttime from /proc/#/stat to absolute
> time and it seems that I need HZ to do that as it is measured in
> jiffies. How can I get HZ? I have seen some discussion about this but
> haven't found a definite answer. procps is using some hacks do it and
> I would prefer to avoid them.
> I only need a solution for modern kernels, say 2.6.20+ if that matters.

`man sysconf`, in particular you want sysconf(_SC_CLK_TCK).