From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933771AbXDZJYL (ORCPT ); Thu, 26 Apr 2007 05:24:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S933793AbXDZJYG (ORCPT ); Thu, 26 Apr 2007 05:24:06 -0400 Received: from il.qumranet.com ([82.166.9.18]:53038 "EHLO il.qumranet.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933771AbXDZJW1 (ORCPT ); Thu, 26 Apr 2007 05:22:27 -0400 From: Avi Kivity To: kvm-devel@lists.sourceforge.net Cc: linux-kernel@vger.kernel.org, Eddie Dong , Avi Kivity Subject: [PATCH 14/18] KVM: VMX: Avoid unnecessary vcpu_load()/vcpu_put() cycles Date: Thu, 26 Apr 2007 12:22:14 +0300 Message-Id: <1177579338397-git-send-email-avi@qumranet.com> X-Mailer: git-send-email 1.5.0.6 In-Reply-To: <11775793382353-git-send-email-avi@qumranet.com> References: <11775793382353-git-send-email-avi@qumranet.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org From: Eddie Dong By checking if a reschedule is needed, we avoid dropping the vcpu. [With changes by me, based on Anthony Liguori's observations] Signed-off-by: Avi Kivity --- drivers/kvm/kvm_main.c | 2 ++ 1 files changed, 2 insertions(+), 0 deletions(-) diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 03c0ee7..f535635 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -1590,6 +1590,8 @@ static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data) void kvm_resched(struct kvm_vcpu *vcpu) { + if (!need_resched()) + return; vcpu_put(vcpu); cond_resched(); vcpu_load(vcpu); -- 1.5.0.6