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

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Message-ID: <20230120231952.GZ2948950@paulmck-ThinkPad-P17-Gen-1>
Date:   Fri, 20 Jan 2023 15:19:52 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Jonas Oberhauser <jonas.oberhauser@...weicloud.com>
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 Fri, Jan 20, 2023 at 11:36:15PM +0100, Jonas Oberhauser wrote:
> 
> 
> 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?

Well, there was this in one of your messages from earlier today: "I'm not
going to get it right today, am I?"  And I freely confess that this led
me to suspect that you might not have been availing yourself of herd7's
opinion before posting.  ;-)

If you clone the Linux kernel source on a Linux system, the information
here should help you get started.  And we are of course here to help.

Your choice, just pointing out the option!

							Thanx, Paul