Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757219AbaAHSvI (ORCPT ); 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" 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 Content-Type: text/plain X-DLP: MIA2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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) -- 1.7.10.4 -- 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/