From: Avi Kivity Subject: [PATCH 2/5] KVM: MMU: use 16 bits for root_count Date: Mon, 26 Apr 2010 11:48:40 +0300 Message-ID: <1272271723-9070-3-git-send-email-avi@redhat.com> References: <1272271723-9070-1-git-send-email-avi@redhat.com> Cc: kvm@vger.kernel.org To: Marcelo Tosatti Return-path: Received: from mx1.redhat.com ([209.132.183.28]:1025 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751229Ab0DZIsp (ORCPT ); Mon, 26 Apr 2010 04:48:45 -0400 Received: from int-mx04.intmail.prod.int.phx2.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.17]) by mx1.redhat.com (8.13.8/8.13.8) with ESMTP id o3Q8mig1009165 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Mon, 26 Apr 2010 04:48:44 -0400 Received: from cleopatra.tlv.redhat.com (cleopatra.tlv.redhat.com [10.35.255.11]) by int-mx04.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id o3Q8mhr0031309 for ; Mon, 26 Apr 2010 04:48:44 -0400 In-Reply-To: <1272271723-9070-1-git-send-email-avi@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: This is incremented by a maximum of 4 for every vcpu, so we are far from overflow. 16 bits improve struct packing. Signed-off-by: Avi Kivity --- arch/x86/include/asm/kvm_host.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index cdaaedc..f38007d 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -192,7 +192,7 @@ struct kvm_mmu_page { */ gfn_t gfn; union kvm_mmu_page_role role; - int root_count; /* Currently serving as active root */ + short root_count; /* Currently serving as active root */ bool multimapped; /* More than one parent_pte? */ bool unsync; union { -- 1.7.0.4