From patchwork Tue Apr 2 05:34:51 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?SsO8cmdlbiBHcm/Dnw==?= X-Patchwork-Id: 10881021 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D3D45184E for ; Tue, 2 Apr 2019 05:37:16 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C0A6A287E0 for ; Tue, 2 Apr 2019 05:37:16 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B4F1528856; Tue, 2 Apr 2019 05:37:16 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 6A63A287E0 for ; Tue, 2 Apr 2019 05:37:16 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hBC4g-00060i-Mw; Tue, 02 Apr 2019 05:35:06 +0000 Received: from all-amaz-eas1.inumbo.com ([34.197.232.57] helo=us1-amaz-eas2.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1hBC4f-00060J-MZ for xen-devel@lists.xenproject.org; Tue, 02 Apr 2019 05:35:05 +0000 X-Inumbo-ID: 0f6a5e0c-5509-11e9-b4df-732ef3a9da17 Received: from mx1.suse.de (unknown [195.135.220.15]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 0f6a5e0c-5509-11e9-b4df-732ef3a9da17; Tue, 02 Apr 2019 05:35:02 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id ED6E6AEFF; Tue, 2 Apr 2019 05:35:00 +0000 (UTC) From: Juergen Gross To: xen-devel@lists.xenproject.org Date: Tue, 2 Apr 2019 07:34:51 +0200 Message-Id: <20190402053457.24912-1-jgross@suse.com> X-Mailer: git-send-email 2.16.4 Subject: [Xen-devel] [PATCH v3 0/6] xen: simplify suspend/resume handling X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Juergen Gross , Tim Deegan , Stefano Stabellini , Wei Liu , Konrad Rzeszutek Wilk , George Dunlap , Andrew Cooper , Ian Jackson , Dario Faggioli , Julien Grall , Jan Beulich , =?utf-8?q?Roger_Pau_Monn=C3=A9?= MIME-Version: 1.0 Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" X-Virus-Scanned: ClamAV using ClamSMTP Especially in the scheduler area (schedule.c, cpupool.c) there is a rather complex handling involved when doing suspend and resume. This can be simplified a lot by not performing a complete cpu down and up cycle for the non-boot cpus, but keeping the pure software related state and freeing it only in case a cpu didn't come up again during resume. In summary not only the complexity can be reduced, but the failure tolerance will be even better with this series: With a dedicated hook for failing cpus when resuming it is now possible to survive e.g. a cpupool being left without any cpu after resume by moving its domains to cpupool0. Juergen Gross (6): xen/sched: call cpu_disable_scheduler() via cpu notifier xen: add helper for calling notifier_call_chain() to common/cpu.c xen: add new cpu notifier action CPU_RESUME_FAILED xen: don't free percpu areas during suspend xen/cpupool: simplify suspend/resume handling xen/sched: don't disable scheduler on cpus during suspend xen/arch/arm/smpboot.c | 2 - xen/arch/x86/percpu.c | 3 +- xen/arch/x86/smpboot.c | 3 - xen/common/cpu.c | 61 +++++++------- xen/common/cpupool.c | 131 ++++++++++++----------------- xen/common/schedule.c | 203 +++++++++++++++++++-------------------------- xen/include/xen/cpu.h | 29 ++++--- xen/include/xen/sched-if.h | 1 - 8 files changed, 190 insertions(+), 243 deletions(-)