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Mon, 27 May 2024 06:32:27 -0700 (PDT) Received: from andrea ([151.76.32.59]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-42100ee7e1fsm143047805e9.6.2024.05.27.06.32.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 27 May 2024 06:32:27 -0700 (PDT) Date: Mon, 27 May 2024 15:32:24 +0200 From: Andrea Parri To: Hernan Ponce de Leon Cc: Alan Stern , 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: References: <20240524151356.236071-1-parri.andrea@gmail.com> <1c6d4146-86f8-4fd5-a23e-a95ba2464c9e@rowland.harvard.edu> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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