From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754525AbdBGRuc (ORCPT ); Tue, 7 Feb 2017 12:50:32 -0500 Received: from aserp1040.oracle.com ([141.146.126.69]:43248 "EHLO aserp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751743AbdBGRub (ORCPT ); Tue, 7 Feb 2017 12:50:31 -0500 Subject: Re: [PATCH v3 3/3] xen: optimize xenbus driver for multiple concurrent xenstore accesses To: Juergen Gross , linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org References: <20170123100918.13523-1-jgross@suse.com> <20170123100918.13523-4-jgross@suse.com> <46b54be4-297a-af8f-aac2-f2a080752034@oracle.com> <252c5d0b-0195-0a56-e236-21e8da449071@oracle.com> <12bbe7e7-eea4-09d0-8282-0b04504daeb2@suse.com> From: Boris Ostrovsky Message-ID: Date: Tue, 7 Feb 2017 12:51:42 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.6.0 MIME-Version: 1.0 In-Reply-To: <12bbe7e7-eea4-09d0-8282-0b04504daeb2@suse.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Source-IP: aserv0022.oracle.com [141.146.126.234] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 01/24/2017 11:23 AM, Juergen Gross wrote: > On 24/01/17 14:47, Boris Ostrovsky wrote: >> On 01/23/2017 01:59 PM, Boris Ostrovsky wrote: >>> On 01/23/2017 05:09 AM, Juergen Gross wrote: >>>> Handling of multiple concurrent Xenstore accesses through xenbus driver >>>> either from the kernel or user land is rather lame today: xenbus is >>>> capable to have one access active only at one point of time. >>>> >>>> >> >> This patch appears to break save/restore: > Hmm, tried multiple times, but I can't reproduce this issue. > > Anything special in the setup? I tried a 64 bit pv guest and did > "xl save". > > Do I have to run some load in parallel? Any luck reproducing this? I am still failing the test on dumpdata but I couldn't reproduce it on another system. -boris