From: Russell King <rmk@arm.linux.org.uk>
To: george anzinger <george@mvista.com>
Cc: Andrew Morton <akpm@zip.com.au>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] Fix jiffies_to_time[spec | val] and converse to use actual jiffies increment rather than 1/HZ
Date: Tue, 15 Apr 2003 09:55:28 +0100 [thread overview]
Message-ID: <20030415095528.B32468@flint.arm.linux.org.uk> (raw)
In-Reply-To: <3E9BC49E.7010903@mvista.com>; from george@mvista.com on Tue, Apr 15, 2003 at 01:36:46AM -0700
On Tue, Apr 15, 2003 at 01:36:46AM -0700, george anzinger wrote:
> In the current system (2.5.67) time_spec to jiffies, time_val to
> jiffies and the converse (jiffies to time_val and jiffies to
> time_spec) all use 1/HZ as the measure of a jiffie. Because of the
> inability of the PIT to actually generate an accurate 1/HZ interrupt,
> the wall clock is updated with a more accurate value (999848
> nanoseconds per jiffie for HZ = 1000).
There's an increasing amount of 64-bit math appearing here, which gcc
has been historically bad with. Is there any chance that all this
extra complexity can vanish for architectures which do not have this
problem?
--
Russell King (rmk@arm.linux.org.uk) The developer of ARM Linux
http://www.arm.linux.org.uk/personal/aboutme.html
next prev parent reply other threads:[~2003-04-15 8:43 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-04-15 8:36 [PATCH] Fix jiffies_to_time[spec | val] and converse to use actual jiffies increment rather than 1/HZ george anzinger
2003-04-15 8:55 ` Russell King [this message]
2003-04-15 9:25 ` george anzinger
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