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From: "Paul E. McKenney" <pmckenne@us.ibm.com>
Message-Id: <200110131448.f9DEmVR07852@eng4.beaverton.ibm.com>
Subject: Re: RFC: patch to allow lock-free traversal of lists with insertion
To: rusty@rustcorp.com.au (Rusty Russell)
Date: Sat, 13 Oct 2001 07:48:30 -0700 (PDT)
Cc: mckenney@eng4.beaverton.ibm.com (Paul E. McKenney),
        lse-tech@lists.sourceforge.net, linux-kernel@vger.kernel.org
In-Reply-To: <20011012141419.4ea534b5.rusty@rustcorp.com.au> from "Rusty Russell" at Oct 12, 2001 01:14:19 PM PST
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>> Here are two patches.  The wmbdd patch has been modified to use
>> the lighter-weight SPARC instruction, as suggested by Dave Miller.
>> The rmbdd patch defines an rmbdd() primitive that is defined to be
>> rmb() on Alpha and a nop on other architectures.  I believe this
>> rmbdd() primitive is what Richard is looking for.
>
>Surely we don't need both?  If rmbdd exists, any code needing wmbdd
>is terminally broken?

One or the other.  And at this point, it looks like rmbdd() (or
read_cache_depends()) is the mechanism of choice, given wmbdd()'s
performance on Alpha.

						Thanx, Paul
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