linux-kernel - Re: Internal vs. external barriers (was: Re: Interesting LKMM litmus test)

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Date:   Fri, 20 Jan 2023 23:36:15 +0100
From:   Jonas Oberhauser <jonas.oberhauser@...weicloud.com>
To:     paulmck@...nel.org
Cc:     Alan Stern <stern@...land.harvard.edu>,
        Andrea Parri <parri.andrea@...il.com>,
        Jonas Oberhauser <jonas.oberhauser@...wei.com>,
        Peter Zijlstra <peterz@...radead.org>, will <will@...nel.org>,
        "boqun.feng" <boqun.feng@...il.com>, npiggin <npiggin@...il.com>,
        dhowells <dhowells@...hat.com>,
        "j.alglave" <j.alglave@....ac.uk>,
        "luc.maranget" <luc.maranget@...ia.fr>, akiyks <akiyks@...il.com>,
        dlustig <dlustig@...dia.com>, joel <joel@...lfernandes.org>,
        urezki <urezki@...il.com>,
        quic_neeraju <quic_neeraju@...cinc.com>,
        frederic <frederic@...nel.org>,
        Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Internal vs. external barriers (was: Re: Interesting LKMM litmus
 test)

On 1/20/2023 10:37 PM, Paul E. McKenney wrote:
>
> Just out of curiosity, are you [set] up to run LKMM locally at your end?

I don't know what exactly that means. I generally run it on wetware.
But I sometimes ask Hernan to run Dat3M (on his machine) over all the 
litmus tests in your repo to spot any obvious problems with variations I 
consider.
I don't think Dat3M is feature-complete with herd at the moment, just 
unbelievably faster. For example I think it ignores all flags in the cat 
files.
Oh, I just remembered that I also installed herd7 recently to make sure 
that any patches I might send in satisfy herd7 syntax requirements (I 
think you called this diagnostic driven development?), but I haven't 
used it to really run anything.

Is it too obvious that my words usually aren't backed by cold machine logic?

Best wishes,
jonas