Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763481AbXJRMjY (ORCPT ); Thu, 18 Oct 2007 08:39:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757553AbXJRMjQ (ORCPT ); Thu, 18 Oct 2007 08:39:16 -0400 Received: from mtagate6.de.ibm.com ([195.212.29.155]:31951 "EHLO mtagate6.de.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757373AbXJRMjP (ORCPT ); Thu, 18 Oct 2007 08:39:15 -0400 From: Christian Borntraeger To: Avi Kivity Subject: Use virtual cpu accounting if available for guest times. Date: Thu, 18 Oct 2007 14:39:10 +0200 User-Agent: KMail/1.9.7 Cc: Laurent Vivier , linux-kernel@vger.kernel.org, kvm-devel References: <47135D1B.1060004@bull.net> <11926264852739-git-send-email-Laurent.Vivier@bull.net> In-Reply-To: <11926264852739-git-send-email-Laurent.Vivier@bull.net> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200710181439.10390.borntraeger@de.ibm.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1601 Lines: 55 Avi, ppc and s390 offer the possibility to track process times precisely by looking at cpu timer on every context switch, irq, softirq etc. We can use that infrastructure as well for guest time accounting. We need to account the used time before we change the state. This patch adds a call to account_system_vtime to kvm_guest_enter and kvm_guest exit. If CONFIG_VIRT_CPU_ACCOUNTING is not set, account_system_vtime is defined in hardirq.h as an empty function, which means this patch does not change the behaviour on other platforms. I compile tested this patch on x86 and function tested the patch on s390. Avi, please apply. Signed-off-by: Christian Borntraeger --- drivers/kvm/kvm.h | 3 +++ 1 file changed, 3 insertions(+) Index: kvm/drivers/kvm/kvm.h =================================================================== --- kvm.orig/drivers/kvm/kvm.h +++ kvm/drivers/kvm/kvm.h @@ -7,6 +7,7 @@ */ #include +#include #include #include #include @@ -669,11 +670,13 @@ __init void kvm_arch_init(void); static inline void kvm_guest_enter(void) { + account_system_vtime(current); current->flags |= PF_VCPU; } static inline void kvm_guest_exit(void) { + account_system_vtime(current); current->flags &= ~PF_VCPU; } - 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/