From patchwork Wed Jan 8 18:49:56 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Stabellini X-Patchwork-Id: 22982 Return-Path: X-Original-To: linaro@patches.linaro.org Delivered-To: linaro@patches.linaro.org Received: from mail-pd0-f197.google.com (mail-pd0-f197.google.com [209.85.192.197]) by ip-10-151-82-157.ec2.internal (Postfix) with ESMTPS id 9C58B202E2 for ; Wed, 8 Jan 2014 18:51:25 +0000 (UTC) Received: by mail-pd0-f197.google.com with SMTP id v10sf5021626pde.4 for ; Wed, 08 Jan 2014 10:51:24 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:delivered-to:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:sender:precedence:list-id :x-original-sender:x-original-authentication-results:mailing-list :list-post:list-help:list-archive:list-unsubscribe:content-type; bh=iDaOlaLsQrRsJojkx/P7q4y+ce2Po9uoojWPOj9DyuY=; b=JgZn4dsox3FTCqhPd3FpMJ3IXMnuy4OqaNSPhE3UAcJ8THr/nef5BrBtmMTXaExBLU LApM4oDvAwbeQOi0/e3lVTPH+4X6ku+8idx4udRg8KyJMEfF1bWL+p1e+5l6m3ih9tiP GjwVpnBDm+aleLNPL8HNYm5cxGsn9schRqvpHxw1lz31n8bjZU0HW+AXJ3E/Z8tFHimy zRZQGYvUYmJ8TXnMtLh6xHcRxSfNRHTgY826BjoaxjqSWrqPICFgnDwXTzWaNWzhGljm /5G//NbPKACPQgyzKEz1JWesaWLYg1AJCE6yDwZQ0ZD2bYzPo6fwifNz5PMko1Zg1kN8 V3Ng== X-Gm-Message-State: ALoCoQkvHDAJvMshxCIL3c1GkDKgiOZxRkeLXGJCW5jR2r7Z+TrrUvRS8qjLbNo5jZkzUxJcD3YI X-Received: by 10.66.221.137 with SMTP id qe9mr5330577pac.4.1389207084902; Wed, 08 Jan 2014 10:51:24 -0800 (PST) X-BeenThere: patchwork-forward@linaro.org Received: by 10.49.35.18 with SMTP id d18ls684541qej.14.gmail; Wed, 08 Jan 2014 10:51:24 -0800 (PST) X-Received: by 10.52.237.228 with SMTP id vf4mr68220183vdc.3.1389207084768; Wed, 08 Jan 2014 10:51:24 -0800 (PST) Received: from mail-ve0-f178.google.com (mail-ve0-f178.google.com [209.85.128.178]) by mx.google.com with ESMTPS id wl16si802795vec.94.2014.01.08.10.51.24 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Wed, 08 Jan 2014 10:51:24 -0800 (PST) Received-SPF: neutral (google.com: 209.85.128.178 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) client-ip=209.85.128.178; Received: by mail-ve0-f178.google.com with SMTP id c14so1601961vea.37 for ; Wed, 08 Jan 2014 10:51:24 -0800 (PST) X-Received: by 10.53.8.1 with SMTP id dg1mr4708887vdd.52.1389207084617; Wed, 08 Jan 2014 10:51:24 -0800 (PST) X-Forwarded-To: patchwork-forward@linaro.org X-Forwarded-For: patch@linaro.org patchwork-forward@linaro.org Delivered-To: patch@linaro.org Received: by 10.59.13.131 with SMTP id ey3csp245618ved; Wed, 8 Jan 2014 10:51:24 -0800 (PST) X-Received: by 10.68.172.196 with SMTP id be4mr144381458pbc.12.1389207083660; Wed, 08 Jan 2014 10:51:23 -0800 (PST) Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id vz4si1352523pac.35.2014.01.08.10.51.23; Wed, 08 Jan 2014 10:51:23 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757221AbaAHSvI (ORCPT + 26 others); Wed, 8 Jan 2014 13:51:08 -0500 Received: from smtp.citrix.com ([66.165.176.89]:9052 "EHLO SMTP.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757167AbaAHSvC (ORCPT ); Wed, 8 Jan 2014 13:51:02 -0500 X-IronPort-AV: E=Sophos;i="4.95,625,1384300800"; d="scan'208";a="90999357" Received: from accessns.citrite.net (HELO FTLPEX01CL01.citrite.net) ([10.9.154.239]) by FTLPIPO01.CITRIX.COM with ESMTP; 08 Jan 2014 18:51:01 +0000 Received: from ukmail1.uk.xensource.com (10.80.16.128) by smtprelay.citrix.com (10.13.107.78) with Microsoft SMTP Server id 14.2.342.4; Wed, 8 Jan 2014 13:51:01 -0500 Received: from kaball.uk.xensource.com ([10.80.2.59]) by ukmail1.uk.xensource.com with esmtp (Exim 4.69) (envelope-from ) id 1W0yDL-0005sr-73; Wed, 08 Jan 2014 18:50:51 +0000 From: Stefano Stabellini To: CC: , , , , , , , , , , , Stefano Stabellini , , , Subject: [PATCH v8 4/6] arm64: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops Date: Wed, 8 Jan 2014 18:49:56 +0000 Message-ID: <1389206998-27875-4-git-send-email-stefano.stabellini@eu.citrix.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: References: MIME-Version: 1.0 X-DLP: MIA2 Sender: linux-kernel-owner@vger.kernel.org Precedence: list List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: stefano.stabellini@eu.citrix.com X-Original-Authentication-Results: mx.google.com; spf=neutral (google.com: 209.85.128.178 is neither permitted nor denied by best guess record for domain of patch+caf_=patchwork-forward=linaro.org@linaro.org) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , Introduce CONFIG_PARAVIRT and PARAVIRT_TIME_ACCOUNTING on ARM64. Necessary duplication of paravirt.h and paravirt.c with ARM. The only paravirt interface supported is pv_time_ops.steal_clock, so no runtime pvops patching needed. This allows us to make use of steal_account_process_tick for stolen ticks accounting. Signed-off-by: Stefano Stabellini CC: will.deacon@arm.com CC: nico@linaro.org CC: marc.zyngier@arm.com CC: cov@codeaurora.org CC: arnd@arndb.de CC: olof@lixom.net CC: Catalin.Marinas@arm.com --- Changes in v7: - ifdef CONFIG_PARAVIRT the content of paravirt.h. --- arch/arm64/Kconfig | 20 ++++++++++++++++++++ arch/arm64/kernel/Makefile | 1 + 2 files changed, 21 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 6d4dd22..d1003ba 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -212,6 +212,25 @@ config HAVE_ARCH_TRANSPARENT_HUGEPAGE source "mm/Kconfig" +config PARAVIRT + bool "Enable paravirtualization code" + ---help--- + This changes the kernel so it can modify itself when it is run + under a hypervisor, potentially improving performance significantly + over full virtualization. + +config PARAVIRT_TIME_ACCOUNTING + bool "Paravirtual steal time accounting" + select PARAVIRT + default n + ---help--- + Select this option to enable fine granularity task steal time + accounting. Time spent executing other tasks in parallel with + the current vCPU is discounted from the vCPU power. To account for + that, there can be a small performance impact. + + If in doubt, say N here. + config XEN_DOM0 def_bool y depends on XEN @@ -220,6 +239,7 @@ config XEN bool "Xen guest support on ARM64 (EXPERIMENTAL)" depends on ARM64 && OF select SWIOTLB_XEN + select PARAVIRT help Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64. diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index 5ba2fd4..1dee735 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -18,6 +18,7 @@ arm64-obj-$(CONFIG_SMP) += smp.o smp_spin_table.o arm64-obj-$(CONFIG_HW_PERF_EVENTS) += perf_event.o arm64-obj-$(CONFIG_HAVE_HW_BREAKPOINT)+= hw_breakpoint.o arm64-obj-$(CONFIG_EARLY_PRINTK) += early_printk.o +arm64-obj-$(CONFIG_PARAVIRT) += paravirt.o obj-y += $(arm64-obj-y) vdso/ obj-m += $(arm64-obj-m)