From nobody Mon May 6 08:02:29 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1494972619238904.310341675723; Tue, 16 May 2017 15:10:19 -0700 (PDT) Received: from localhost ([::1]:44345 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dAkfZ-0002X6-QS for importer@patchew.org; Tue, 16 May 2017 18:10:17 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37040) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dAken-0002F3-0K for qemu-devel@nongnu.org; Tue, 16 May 2017 18:09:29 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dAkej-0006oE-Oy for qemu-devel@nongnu.org; Tue, 16 May 2017 18:09:29 -0400 Received: from mga02.intel.com ([134.134.136.20]:53978) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dAkej-0006ni-HB for qemu-devel@nongnu.org; Tue, 16 May 2017 18:09:25 -0400 Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga101.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 16 May 2017 15:09:24 -0700 Received: from xps7800.sc.intel.com ([10.3.52.155]) by fmsmga006.fm.intel.com with ESMTP; 16 May 2017 15:09:24 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.38,351,1491289200"; d="scan'208";a="102923264" From: Anthony Xu To: qemu-devel@nongnu.org Date: Tue, 16 May 2017 15:15:23 -0700 Message-Id: <1494972923-31756-1-git-send-email-anthony.xu@intel.com> X-Mailer: git-send-email 1.8.3.1 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 134.134.136.20 Subject: [Qemu-devel] [PATCH] Memory: use memory address space for cpu-memory X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: pbonzini@redhat.com, Anthony Xu Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" If cpu-memory address space is same as memory address space, use memory address space for cpu-memory address space. any memory region change causeaddress space to rebuild PhysPageMap, rebuilding PhysPageMap is very expensive. removing cpu-memory address space reduces the guest boot time and memory usage. Signed-off-by: Anthony Xu --- cpus.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/cpus.c b/cpus.c index 740b8dc..15c7a6a 100644 --- a/cpus.c +++ b/cpus.c @@ -1748,8 +1748,13 @@ void qemu_init_vcpu(CPUState *cpu) /* If the target cpu hasn't set up any address spaces itself, * give it the default one. */ - AddressSpace *as =3D address_space_init_shareable(cpu->memory, - "cpu-memory"); + AddressSpace *as; + if (cpu->memory =3D=3D address_space_memory.root) { + address_space_memory.ref_count++; + as =3D &address_space_memory; + } else { + as =3D address_space_init_shareable(cpu->memory, "cpu-memory"); + } cpu->num_ases =3D 1; cpu_address_space_init(cpu, as, 0); } --=20 1.8.3.1