From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754282AbcESKxN (ORCPT ); Thu, 19 May 2016 06:53:13 -0400 Received: from mail-wm0-f65.google.com ([74.125.82.65]:33178 "EHLO mail-wm0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753960AbcESKxM (ORCPT ); Thu, 19 May 2016 06:53:12 -0400 Subject: Re: [Xen-devel] [PATCH] x86, locking: Remove ticket (spin)lock implementation To: Peter Zijlstra , Konrad Rzeszutek Wilk References: <20160518184302.GO3193@twins.programming.kicks-ass.net> <20160518191344.GA9101@char.us.oracle.com> <20160518193431.GQ3193@twins.programming.kicks-ass.net> Cc: mingo@kernel.org, kvm@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, Waiman.Long@hpe.com, dhowells@redhat.com, david.vrabel@citrix.com, xen-devel@lists.xenproject.org From: Paolo Bonzini Message-ID: Date: Thu, 19 May 2016 12:52:57 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.0 MIME-Version: 1.0 In-Reply-To: <20160518193431.GQ3193@twins.programming.kicks-ass.net> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 18/05/2016 21:34, Peter Zijlstra wrote: >> I don't know of any enterprise distro that is shipping anything >> > more modern than 4.1? > RHEL 7 -- v3.10 > SLES 12 -- v3.12 > Debian Jessie -- v3.16 > Ubuntu 16.04 LTS -- v4.4 > > But waiting for the major enterprise distros (RHEL/SLES) would mean > another decade or so before people start using it. We don't usually wait > this long for anything. We're looking at converting a few specific spinlocks to qspinlock in RHEL, though we cannot convert all of them due to the spin_lock_t ABI. It won't get into customer's hands for a while of course. Thanks, Paolo