Received-SPF: pass (google.com: domain of linux-kernel+bounces-190661-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.199.223 as permitted sender) client-ip=147.75.199.223;
Message-ID: <747c6690-5314-4c23-b48d-1b463d058e0d@huaweicloud.com>
Date: Mon, 27 May 2024 15:14:59 +0200
Precedence: bulk
MIME-Version: 1.0
User-Agent: Mozilla Thunderbird
Subject: Re: [PATCH] tools/memory-model: Document herd7 (internal)
 representation
To: Hernan Ponce de Leon <hernan.poncedeleon@huaweicloud.com>,
 Andrea Parri <parri.andrea@gmail.com>, Alan Stern <stern@rowland.harvard.edu>
Cc: 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
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>
From: Jonas Oberhauser <jonas.oberhauser@huaweicloud.com>
In-Reply-To: <b7365700-a983-b787-e22a-7526621d4c18@huaweicloud.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit


Am 5/27/2024 um 2:25 PM schrieb Hernan Ponce de Leon:
> 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]
> 
>>
>>    Andrea
> 


Note that the * is also what herd will show in its graphs.

   jonas