From: yodaiken@fsmlabs.com
To: yodaiken@fsmlabs.com, Robert Love <rml@tech9.net>,
Mikael Pettersson <mikpe@csd.uu.se>,
linux kernel <linux-kernel@vger.kernel.org>
Subject: Re: 2.4.18 Preempt Freezeups
Date: Fri, 15 Mar 2002 20:12:40 -0700 [thread overview]
Message-ID: <20020315201240.A7368@hq.fsmlabs.com> (raw)
In-Reply-To: <3C9153A7.292C320@ianduggan.net> <1016157250.4599.62.camel@phantasy> <3C91B2A1.48C74B82@ianduggan.net> <1016202310.908.1.camel@phantasy> <15506.7486.729120.64389@kim.it.uu.se> <1016219530.904.21.camel@phantasy> <20020315174036.A5068@hq.fsmlabs.com> <20020316014615.GE363@matchmail.com>
In-Reply-To: <20020316014615.GE363@matchmail.com>; from mfedyk@matchmail.com on Fri, Mar 15, 2002 at 05:46:15PM -0800
On Fri, Mar 15, 2002 at 05:46:15PM -0800, Mike Fedyk wrote:
> On Fri, Mar 15, 2002 at 05:40:36PM -0700, yodaiken@fsmlabs.com wrote:
> > On Fri, Mar 15, 2002 at 02:11:49PM -0500, Robert Love wrote:
> > > If you "poke the processor", to be SMP-safe, you should hold a lock to
> > > prevent multiple concurrent "pokings of the processor" - thus you become
> > > preempt-safe.
> >
> > Without preempt:
> > x = movefrom processor register;
> > do_something with x
> >
> > is safe in SMP
> > With SMP it requires a lock.
> >
>
> "With preempt it requires a lock" you mean?
Yep. Keyboard Operator error.
--
---------------------------------------------------------
Victor Yodaiken
Finite State Machine Labs: The RTLinux Company.
www.fsmlabs.com www.rtlinux.com
next prev parent reply other threads:[~2002-03-16 3:12 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-15 1:51 2.4.18 Preempt Freezeups Ian Duggan
2002-03-15 1:54 ` Robert Love
2002-03-15 8:36 ` Ian Duggan
2002-03-15 14:25 ` Robert Love
2002-03-15 16:11 ` Mikael Pettersson
2002-03-15 19:11 ` Robert Love
2002-03-16 0:40 ` yodaiken
2002-03-16 1:46 ` Mike Fedyk
2002-03-16 3:12 ` yodaiken [this message]
2002-03-17 0:33 ` Daniel Phillips
2002-03-17 1:13 ` yodaiken
2002-03-17 1:14 ` Daniel Phillips
2002-03-17 1:54 ` yodaiken
2002-03-17 2:08 ` Daniel Phillips
2002-03-17 21:17 ` Davide Libenzi
2002-03-15 14:30 ` Alan Cox
2002-03-15 21:36 ` Ian Duggan
2002-03-15 2:11 ` Alan Cox
2002-03-15 8:38 ` Ian Duggan
2002-03-15 8:51 ` David S. Miller
2002-03-15 14:28 ` Alan Cox
2002-03-16 23:51 ` Daniel Phillips
2002-03-17 3:31 ` Alan Cox
2002-03-17 12:59 ` Dave Jones
2002-03-15 8:43 ` Daniel Phillips
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