Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752822Ab3IIKep (ORCPT ); Mon, 9 Sep 2013 06:34:45 -0400 Received: from smtp02.citrix.com ([66.165.176.63]:38068 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752168Ab3IIKeo (ORCPT ); Mon, 9 Sep 2013 06:34:44 -0400 X-IronPort-AV: E=Sophos;i="4.90,866,1371081600"; d="scan'208";a="49544886" Message-ID: <522DA442.4050803@citrix.com> Date: Mon, 9 Sep 2013 11:34:42 +0100 From: David Vrabel User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.16) Gecko/20121215 Iceowl/1.0b1 Icedove/3.0.11 MIME-Version: 1.0 To: Konrad Rzeszutek Wilk CC: , , , , , Subject: Re: [PATCH] Bug-fixes to enable PV ticketlock to work under Xen PVHVM with Linux v3.12. (v1) References: <1378561605-18998-1-git-send-email-konrad.wilk@oracle.com> In-Reply-To: <1378561605-18998-1-git-send-email-konrad.wilk@oracle.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.80.2.76] X-DLP: MIA2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1624 Lines: 32 On 07/09/13 14:46, Konrad Rzeszutek Wilk wrote: > After a bit of false starts, lots of debugging, and tons of help from Stefano and > David on how event mechanism is suppose to work I am happy to present a set > of bug-fixes that make PV ticketlocks work under Xen PVHVM with Linux v3.12. > > v3.12 has now thanks to commit 816434ec4a674fcdb3c2221a6dffdc8f34020550 > (Merge branch 'x86-spinlocks-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip) > PV ticketlocks. That means: > - Xen PV bytelock has been replaced by Xen PV ticketlock. > - Xen PVHVM is using ticketlock (not PV variant) - this patch makes it PV. > - baremetal is still using ticketlocks. > > In other words everything in the kernel is ticketlock based with the virtualizations > having the 'PV' part to aid. > > Please take a look at the patches. If you are interested in testing them > out I will post a git tree on Monday based on v3.11 and v3.12-rc0. > > Note that I had not run any performance tests and I am not sure when I will > be able to (got other bugs to squash now). I've asked our internal performance > engineer to do some benchmarking - but those results won't be available for > some time as it takes time to do good benchmarking. If there was favourable performance data I would be happy for these to go in 3.12, without I think they'll have to wait for 3.13. David -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/