linux-kernel - Re: HZ from userspace

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Message-ID: <d77765540808061507v47561931x23a23c30067bc57b@mail.gmail.com>
Date:	Wed, 6 Aug 2008 22:07:46 +0000
From:	"Piotr Jaroszyński" <p.jaroszynski@...il.com>
To:	"Ray Lee" <ray-lk@...rabbit.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: HZ from userspace

>> 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).

manpage says it's obsolete and i read in some discussion that it only
returns the default and not the real HZ used.

-- 
Best Regards,
Piotr Jaroszyński