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Message-ID: <12c511ca0607071951p4fe7e1bfm7be5ad48ede895f1@mail.gmail.com>
Date: Fri, 7 Jul 2006 19:51:52 -0700
From: "Tony Luck" <tony.luck@intel.com>
To: "Jeremy Higdon" <jeremy@sgi.com>
Subject: Re: [PATCH] ia64: change usermode HZ to 250
Cc: "Arjan van de Ven" <arjan@infradead.org>, "Jes Sorensen" <jes@sgi.com>,
       "Alan Cox" <alan@lxorguk.ukuu.org.uk>, "John Daiker" <jdaiker@osdl.org>,
       "John Hawkes" <hawkes@sgi.com>, "Andrew Morton" <akpm@osdl.org>,
       linux-ia64@vger.kernel.org, linux-kernel@vger.kernel.org,
       "Jack Steiner" <steiner@sgi.com>, "Dan Higgins" <djh@sgi.com>
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> So does i386 convert the return value of the times(2) call to user
> hertz?  On IA64, it returns the value in internal clock ticks, and
> then when a program uses the value in param.h, it gets it wrong now,
> because internal HZ is now 250.
>
> So is times() is broken in IA64, or is this an exception to Alan's
> statement?

The Linux man page for times(2) specifically says "ticks" and refers
to sysconf for how to determine how long a "tick" is.  So ia64 matches
the man page.  Dunno if that matches POSIX though.

-Tony