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Date: Mon, 27 May 2024 15:32:24 +0200
From: Andrea Parri <parri.andrea@gmail.com>
To: Hernan Ponce de Leon <hernan.poncedeleon@huaweicloud.com>
Cc: Alan Stern <stern@rowland.harvard.edu>, will@kernel.org,
	peterz@infradead.org, boqun.feng@gmail.com, npiggin@gmail.com,
	dhowells@redhat.com, j.alglave@ucl.ac.uk, luc.maranget@inria.fr,
	paulmck@kernel.org, akiyks@gmail.com, dlustig@nvidia.com,
	joel@joelfernandes.org, linux-kernel@vger.kernel.org,
	linux-arch@vger.kernel.org, jonas.oberhauser@huaweicloud.com
Subject: Re: [PATCH] tools/memory-model: Document herd7 (internal)
 representation
Message-ID: <ZlSLaOiSqmX+mPDC@andrea>
References: <20240524151356.236071-1-parri.andrea@gmail.com>
 <1c6d4146-86f8-4fd5-a23e-a95ba2464c9e@rowland.harvard.edu>
 <ZlC5q7bcdCAe7xPp@andrea>
 <b7365700-a983-b787-e22a-7526621d4c18@huaweicloud.com>
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In-Reply-To: <b7365700-a983-b787-e22a-7526621d4c18@huaweicloud.com>

On Mon, May 27, 2024 at 02:25:01PM +0200, Hernan Ponce de Leon wrote:
> On 5/24/2024 6:00 PM, Andrea Parri wrote:
> > > What's the difference between R and R*, or between W and W*?
> > 
> > AFAIU, herd7 uses such notation, "*", to denote a load or a store which
> > is also in RMW.
> 
> I also got confused with this. What about the following notation?
> 
> 	R[once,RMW] ->rmw W[once,RMW]

I'll add a (minimal) legenda describing this and some other notations in the
next version.  As Jonas remarked in his reply, * is what you would currently
find in herd7-generated graphs, so I'd stick to it for the moment.

  Andrea