From: Joel Becker <Joel.Becker@oracle.com>
To: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Clock monotonic a suggestion
Date: Fri, 21 Mar 2003 11:44:17 -0800 [thread overview]
Message-ID: <20030321194417.GC31586@ca-server1.us.oracle.com> (raw)
In-Reply-To: <20030321131744.GL27366@admingilde.org>
On Fri, Mar 21, 2003 at 02:17:44PM +0100, Martin Waitz wrote:
> why don't you simply use asm("rdtsc") ?
> (ok, you should make sure that you always ask the same processor and
> stuff, but using the built in TSC seems to do everything you want...)
It does. That's the point. monotonic_clock() is intended as a
portable and consistent wrapper around such access. Otherwise, any
module that needs such access must do system specific work (TSC on x86,
cyclone on x86-x440, other stuff on S/390, etc). In addition, having
speedstep handling in one place is a good thing.
Joel
--
Life's Little Instruction Book #335
"Every so often, push your luck."
Joel Becker
Senior Member of Technical Staff
Oracle Corporation
E-mail: joel.becker@oracle.com
Phone: (650) 506-8127
prev parent reply other threads:[~2003-03-21 19:54 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-21 0:16 Clock monotonic a suggestion george anzinger
2003-03-21 2:50 ` Joel Becker
2003-03-21 5:53 ` Chris Friesen
2003-03-21 8:10 ` george anzinger
2003-03-21 8:01 ` george anzinger
2003-03-21 19:43 ` Joel Becker
2003-03-21 20:53 ` john stultz
2003-03-21 13:17 ` Martin Waitz
2003-03-21 19:18 ` george anzinger
2003-03-21 19:46 ` Joel Becker
2003-03-21 19:44 ` Joel Becker [this message]
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