From patchwork Wed Dec 2 11:06:03 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Borntraeger X-Patchwork-Id: 7744801 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 8D89E9F387 for ; Wed, 2 Dec 2015 11:08:20 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C306920534 for ; Wed, 2 Dec 2015 11:08:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E734B20511 for ; Wed, 2 Dec 2015 11:08:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756748AbbLBLID (ORCPT ); Wed, 2 Dec 2015 06:08:03 -0500 Received: from e06smtp11.uk.ibm.com ([195.75.94.107]:33637 "EHLO e06smtp11.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756984AbbLBLGG (ORCPT ); Wed, 2 Dec 2015 06:06:06 -0500 Received: from localhost by e06smtp11.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Wed, 2 Dec 2015 11:06:04 -0000 Received: from d06dlp02.portsmouth.uk.ibm.com (9.149.20.14) by e06smtp11.uk.ibm.com (192.168.101.141) with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted; Wed, 2 Dec 2015 11:06:01 -0000 X-IBM-Helo: d06dlp02.portsmouth.uk.ibm.com X-IBM-MailFrom: borntraeger@de.ibm.com X-IBM-RcptTo: kvm@vger.kernel.org;linux-s390@vger.kernel.org Received: from b06cxnps4074.portsmouth.uk.ibm.com (d06relay11.portsmouth.uk.ibm.com [9.149.109.196]) by d06dlp02.portsmouth.uk.ibm.com (Postfix) with ESMTP id D1727219006E; Wed, 2 Dec 2015 11:05:53 +0000 (GMT) Received: from d06av06.portsmouth.uk.ibm.com (d06av06.portsmouth.uk.ibm.com [9.149.37.217]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id tB2B60jj8519960; Wed, 2 Dec 2015 11:06:00 GMT Received: from d06av06.portsmouth.uk.ibm.com (localhost [127.0.0.1]) by d06av06.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id tB2B5xJJ017590; Wed, 2 Dec 2015 04:06:00 -0700 Received: from tuxmaker.boeblingen.de.ibm.com (tuxmaker.boeblingen.de.ibm.com [9.152.85.9]) by d06av06.portsmouth.uk.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id tB2B5xUu017575 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Wed, 2 Dec 2015 04:05:59 -0700 Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 25651) id 6457B20F537; Wed, 2 Dec 2015 12:05:59 +0100 (CET) From: Christian Borntraeger To: Paolo Bonzini Cc: KVM , linux-s390 , Cornelia Huck , Jens Freimann , Alexander Graf Subject: [GIT PULL 02/23] KVM: use heuristic for fast VCPU lookup by id Date: Wed, 2 Dec 2015 12:06:03 +0100 Message-Id: <1449054384-76374-3-git-send-email-borntraeger@de.ibm.com> X-Mailer: git-send-email 2.3.0 In-Reply-To: <1449054384-76374-1-git-send-email-borntraeger@de.ibm.com> References: <1449054384-76374-1-git-send-email-borntraeger@de.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 15120211-0041-0000-0000-000006BC106B Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: David Hildenbrand Usually, VCPU ids match the array index. So let's try a fast lookup first before falling back to the slow iteration. Suggested-by: Christian Borntraeger Reviewed-by: Dominik Dingel Reviewed-by: Christian Borntraeger Signed-off-by: David Hildenbrand Signed-off-by: Christian Borntraeger --- include/linux/kvm_host.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 2911919..a754fc0 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -472,6 +472,11 @@ static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id) struct kvm_vcpu *vcpu; int i; + if (id < 0 || id >= KVM_MAX_VCPUS) + return NULL; + vcpu = kvm_get_vcpu(kvm, id); + if (vcpu && vcpu->vcpu_id == id) + return vcpu; kvm_for_each_vcpu(i, vcpu, kvm) if (vcpu->vcpu_id == id) return vcpu;