From: Kasper Dupont <kasperd@daimi.au.dk>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Linux-Kernel <linux-kernel@vger.kernel.org>
Subject: Re: It hurts when I shoot myself in the foot
Date: Fri, 24 May 2002 17:36:27 +0200 [thread overview]
Message-ID: <3CEE5DFB.985EFF6E@daimi.au.dk> (raw)
In-Reply-To: <E17BHKb-0006hz-00@the-village.bc.nu>
Alan Cox wrote:
>
> > If the kernel knew multipliers couldn't it actually use the TSCs
> > anyway? Of course it would take some work, but is there any
> > reason why it would not be posible?
>
> In 2.4 yes. In 2.5 it would be close to impossible due to the pre-empt code
Couldn't that be solved in one of the following ways?
1) Disable pre-emption while reading TSC and CPU nr.
2) Use affinity for processes pre-empted in kernel mode.
3) Disable pre-emption for SMP systems.
--
Kasper Dupont -- der bruger for meget tid på usenet.
For sending spam use mailto:razor-report@daimi.au.dk
next prev parent reply other threads:[~2002-05-24 15:37 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-05-22 16:15 It hurts when I shoot myself in the foot Chris
2002-05-22 23:39 ` H. Peter Anvin
2002-05-23 3:48 ` Andreas Dilger
2002-05-23 4:49 ` Mike Fedyk
2002-05-23 5:42 ` Andreas Dilger
2002-05-23 17:33 ` Mike Fedyk
2002-05-23 22:28 ` Vojtech Pavlik
2002-05-24 7:32 ` Mike Fedyk
2002-05-24 7:36 ` Vojtech Pavlik
2002-05-24 15:28 ` Alan Cox
2002-05-24 15:20 ` Kasper Dupont
2002-05-24 15:50 ` Alan Cox
2002-05-24 15:36 ` Kasper Dupont [this message]
2002-05-24 16:09 ` Alan Cox
2002-05-24 16:39 ` Kasper Dupont
2002-05-24 18:44 ` Alan Cox
2002-05-24 16:36 ` Austin Gonyou
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