From patchwork Wed Jul 24 14:31:02 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Garzarella X-Patchwork-Id: 1136345 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 45tyTK0nLCz9s3l for ; Thu, 25 Jul 2019 00:31:31 +1000 (AEST) Received: from localhost ([::1]:52148 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hqIIh-0002Se-TB for incoming@patchwork.ozlabs.org; Wed, 24 Jul 2019 10:31:27 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:58730) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hqIIa-0002SF-Hu for qemu-devel@nongnu.org; Wed, 24 Jul 2019 10:31:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hqIIZ-000556-B8 for qemu-devel@nongnu.org; Wed, 24 Jul 2019 10:31:20 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59360) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hqIIW-00052D-D7 for qemu-devel@nongnu.org; Wed, 24 Jul 2019 10:31:17 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3E49213A98; Wed, 24 Jul 2019 14:31:14 +0000 (UTC) Received: from steredhat.redhat.com (ovpn-117-46.ams2.redhat.com [10.36.117.46]) by smtp.corp.redhat.com (Postfix) with ESMTP id 52BC860BF3; Wed, 24 Jul 2019 14:31:06 +0000 (UTC) From: Stefano Garzarella To: qemu-devel@nongnu.org Date: Wed, 24 Jul 2019 16:31:02 +0200 Message-Id: <20190724143105.307042-1-sgarzare@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.29]); Wed, 24 Jul 2019 14:31:14 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v4 0/3] pc: mmap kernel (ELF image) and initrd X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Eduardo Habkost , Sergio Lopez , "Michael S. Tsirkin" , Julio Montes , "Dr . David Alan Gilbert" , Paolo Bonzini , Richard Henderson Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" In order to reduce the memory footprint when PVH kernel and initrd are used, we map them into memory instead of reading them. In this way we can share them between multiple instances of QEMU. v4: - Patch 1: fix the rom_add_elf_program() comment [Paolo] - Patch 2: ~ fix the missing of g_mapped_file_unref() in the success case [Paolo] ~ fix the rom_add_elf_program() comment [Paolo] v3: https://patchew.org/QEMU/20190724112531.232260-1-sgarzare@redhat.com/ v2: https://patchew.org/QEMU/20190723140445.12748-1-sgarzare@redhat.com/ These are the results using a PVH kernel and initrd (cpio): - memory footprint (using smem) [MB] QEMU before now # instances USS PSS USS PSS 1 102.0M 105.8M 102.3M 106.2M 2 94.6M 101.2M 72.3M 90.1M 4 94.1M 98.0M 72.0M 81.5M 8 94.0M 96.2M 71.8M 76.9M 16 93.9M 95.1M 71.6M 74.3M Initrd size: 3.0M Kernel image size: 28M sections size [size -A -d vmlinux]: 18.9M - boot time [ms] before now qemu_init_end: 63.85 55.91 linux_start_kernel: 82.11 (+18.26) 74.51 (+18.60) linux_start_user: 169.94 (+87.83) 159.06 (+84.56) QEMU command used: ./qemu-system-x86_64 -bios /path/to/seabios/out/bios.bin -no-hpet \ -machine q35,accel=kvm,kernel_irqchip,nvdimm,sata=off,smbus=off,vmport=off \ -cpu host -m 1G -smp 1 -vga none -display none -no-user-config -nodefaults \ -kernel /path/to/vmlinux -initrd /path/to/rootfs.cpio \ -append 'root=/dev/mem0 ro console=hvc0 pci=lastbus=0 nosmap' Stefano Garzarella (3): loader: Handle memory-mapped ELFs elf-ops.h: Map into memory the ELF to load hw/i386/pc: Map into memory the initrd hw/core/loader.c | 38 +++++++++++++++++++----- hw/i386/pc.c | 17 ++++++++--- include/hw/elf_ops.h | 71 ++++++++++++++++++++++++++------------------ include/hw/i386/pc.h | 1 + include/hw/loader.h | 5 ++-- 5 files changed, 89 insertions(+), 43 deletions(-)