linux-kernel - Re: [PATCH v2] tools/memory-model: Add extra ordering for locks and remove it for ordinary release/acquire

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Date:   Thu, 12 Jul 2018 19:17:46 -0700
From:   Daniel Lustig <dlustig@...dia.com>
To:     Will Deacon <will.deacon@....com>,
        Peter Zijlstra <peterz@...radead.org>
CC:     Andrea Parri <andrea.parri@...rulasolutions.com>,
        Alan Stern <stern@...land.harvard.edu>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        LKMM Maintainers -- Akira Yokosawa <akiyks@...il.com>,
        Boqun Feng <boqun.feng@...il.com>,
        David Howells <dhowells@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        Luc Maranget <luc.maranget@...ia.fr>,
        Nicholas Piggin <npiggin@...il.com>,
        Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] tools/memory-model: Add extra ordering for locks and
 remove it for ordinary release/acquire

On 7/12/2018 2:45 AM, Will Deacon wrote:
> On Thu, Jul 12, 2018 at 11:34:32AM +0200, Peter Zijlstra wrote:
>> On Thu, Jul 12, 2018 at 09:40:40AM +0200, Peter Zijlstra wrote:
>>> And I think if we raise atomic*_acquire() to require TSO (but ideally
>>> raise it to RCsc) we're there.
>>
>> To clarify, just the RmW-acquire. Things like atomic_read_acquire() can
>> stay smp_load_acquire() and be RCpc.
> 
> I don't have strong opinions about strengthening RmW atomics to TSO, so
> if it helps to unblock Alan's patch (which doesn't go near this!) then I'll
> go with it. The important part is that we continue to allow roach motel
> into the RmW for other accesses in the non-fully-ordered cases.
> 
> Daniel -- your AMO instructions are cool with this, right? It's just the
> fence-based implementations that will need help?
> 
> Will
Right, let me pull this part out of the overly-long response I just gave
on the thread with Linus :)

if we pair AMOs with AMOs, we get RCsc, and everything is fine.  If we
start mixing in fences (mostly because we don't currently have native
load-acquire or store-release opcodes), then that's when all the rest of the
complexity comes in.

Dan