From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Monjalon <thomas@monjalon.net>
Subject: Re: [PATCH v3 0/2] ring library with c11 memory model
	bug fix and optimization
Date: Wed, 31 Oct 2018 17:58:15 +0100
Message-ID: <1608765.iL9IWifpLk@xps>
References: <1540956945-211373-1-git-send-email-gavin.hu@arm.com>
 <1540981587-88590-1-git-send-email-gavin.hu@arm.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7Bit
Cc: Gavin Hu <gavin.hu@arm.com>, olivier.matz@6wind.com,
 chaozhu@linux.vnet.ibm.com, bruce.richardson@intel.com,
 konstantin.ananyev@intel.com, jerin.jacob@caviumnetworks.com,
 Honnappa.Nagarahalli@arm.com
To: dev@dpdk.org, qian.q.xu@intel.com
Return-path: <dev-bounces@dpdk.org>
Received: from out3-smtp.messagingengine.com (out3-smtp.messagingengine.com
 [66.111.4.27]) by dpdk.org (Postfix) with ESMTP id 3178E239
 for <dev@dpdk.org>; Wed, 31 Oct 2018 17:58:13 +0100 (CET)
In-Reply-To: <1540981587-88590-1-git-send-email-gavin.hu@arm.com>
List-Id: DPDK patches and discussions <dev.dpdk.org>
List-Unsubscribe: <https://mails.dpdk.org/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://mails.dpdk.org/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <https://mails.dpdk.org/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
Errors-To: dev-bounces@dpdk.org
Sender: "dev" <dev-bounces@dpdk.org>

Last call for review.

Qian, it probably makes to have a validation test of this patchset.


31/10/2018 11:26, Gavin Hu:
> v2->v3
> 1) reword the change and relocate it in the release note.
> 
> v1->v2
> 1) Add the changes to the 18.11 release note.
> 
> V1:
> Updated the ring library with C11 memory model including the following changes
> 1) Synchronize the load and store of the tail to ensure the enqueue/dequeue
>    operations are really completed before seen by the observers on the other
>    sides.
> 2) Move the atomic load of head above the loop for the first iteration,it is
>    not unnecessary and degrade performance for the other iteration as the head
>    was loaded in the failure case of CAS.
> 
> Gavin Hu (2):
>   ring: synchronize the load and store of the tail
>   ring: move the atomic load of head above the loop
> 
>  doc/guides/rel_notes/release_18_11.rst |  7 +++++++
>  lib/librte_ring/rte_ring_c11_mem.h     | 24 +++++++++++++++++-------
>  2 files changed, 24 insertions(+), 7 deletions(-)