Re: [PATCH] refcount: provide same memory ordering guarantees as in atomic_t

From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: "Reshetova, Elena" <elena.reshetova@intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	"keescook@chromium.org" <keescook@chromium.org>,
	"tglx@linutronix.de" <tglx@linutronix.de>,
	"mingo@redhat.com" <mingo@redhat.com>,
	"ishkamiel@gmail.com" <ishkamiel@gmail.com>,
	Will Deacon <will.deacon@arm.com>,
	"stern@rowland.harvard.edu" <stern@rowland.harvard.edu>,
	"parri.andrea@gmail.com" <parri.andrea@gmail.com>,
	"boqun.feng@gmail.com" <boqun.feng@gmail.com>,
	"dhowells@redhat.com" <dhowells@redhat.com>,
	"david@fromorbit.com" <david@fromorbit.com>
Subject: Re: [PATCH] refcount: provide same memory ordering guarantees as in atomic_t
Date: Thu, 16 Nov 2017 07:29:22 -0800	[thread overview]
Message-ID: <20171116152922.GS3624@linux.vnet.ibm.com> (raw)
In-Reply-To: <20171116134430.kbc2x2yryx7546z6@dhcp22.suse.cz>

On Thu, Nov 16, 2017 at 02:44:30PM +0100, Michal Hocko wrote:
> On Mon 13-11-17 09:09:57, Reshetova, Elena wrote:
> > <snip>
> > 
> > > Note that there's work done on better documents and updates to this one.
> > > One document that might be good to read (I have not in fact had time to
> > > read it myself yet :-():
> > > 
> > >   https://github.com/aparri/memory-
> > > model/blob/master/Documentation/explanation.txt
> > > 
> > 
> > I have just finished reading over this and must say that this is excellent. 
> 
> I fully second this. The main problem with
> Documentation/memory-barriers.txt is that it jumps from "easy to follow"
> to "blow your head" parts is just too quick. On the other hand the above
> explanation builds the picture from basics and piles up new layers on
> top of previous. So I found it much more easier to grasp. I cannot
> really speak for the correctness in all aspects but it certainly makes a
> lot of sense to me. If you are really interested then feel free to add.
> Acked-by: Michal Hocko <mhocko@suse.com>

Thank you, props to Alan for the writing, and I have applied your ack!

							Thanx, Paul