linux-kernel - Re: Userspace RCU 0.2.3

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Message-ID: <20091015090042.GA7677@feather>
Date:	Thu, 15 Oct 2009 02:00:43 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
Cc:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Jon Bernard <jbernard@...ian.org>,
	Jan Blunck <jblunck@...e.de>,
	Pierre Habouzit <madcoder@...ian.org>,
	Steven Munroe <munroesj@...ux.vnet.ibm.com>,
	Bert Wesarg <bert.wesarg@...glemail.com>,
	Pierre-Marc Fournier <pierre-marc.fournier@...ymtl.ca>,
	ltt-dev@...ts.casi.polymtl.ca, rp@...s.cs.pdx.edu,
	linux-kernel@...r.kernel.org
Subject: Re: Userspace RCU 0.2.3

On Wed, Oct 14, 2009 at 10:39:25PM -0400, Mathieu Desnoyers wrote:
> * Paul E. McKenney (paulmck@...ux.vnet.ibm.com) wrote:
> > On Wed, Oct 14, 2009 at 06:36:57PM -0400, Mathieu Desnoyers wrote:
> > > Hi,
> > > 
> > > I just released lib urcu 0.2.3, which is now using autotools. I also
> > > integrated automatic architecture detection for old 386 which lack
> > > cmpxchg (using a fall-back if necessary). I also use a lock; addl
> > > instead of mfence on x86-32 to support a larger variety of older Intel
> > > CPUs.
> > 
> > !!!
> > 
> > Is there anyone on these lists other than me who has actually used an
> > SMP 80386-based system?
> 
> SMP 386, ugh, no. But UP 386 yes (at least me). :)
> 
> It will become important as the library gets integrated in
> distributions.

Even Debian has given up on real 386 systems at this point, primarily
because system libraries like glibc have; 486 and better represents the
bare minimum required at this point.  I don't know of any distributions
supporting real 386 systems at this point, and doing so would represent
a major undertaking.

- Josh Triplett
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