linux-kernel - Re: [PATCH] tools/memory-model: Document herd7 (internal) representation

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Message-ID: <ZlSLaOiSqmX+mPDC@andrea>
Date: Mon, 27 May 2024 15:32:24 +0200
From: Andrea Parri <parri.andrea@...il.com>
To: Hernan Ponce de Leon <hernan.poncedeleon@...weicloud.com>
Cc: Alan Stern <stern@...land.harvard.edu>, will@...nel.org,
	peterz@...radead.org, boqun.feng@...il.com, npiggin@...il.com,
	dhowells@...hat.com, j.alglave@....ac.uk, luc.maranget@...ia.fr,
	paulmck@...nel.org, akiyks@...il.com, dlustig@...dia.com,
	joel@...lfernandes.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org, jonas.oberhauser@...weicloud.com
Subject: Re: [PATCH] tools/memory-model: Document herd7 (internal)
 representation

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