From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 46965C3F2CD for ; Thu, 5 Mar 2020 13:43:44 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 119AD2073D for ; Thu, 5 Mar 2020 13:43:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="IxRfGW/6" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 119AD2073D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:49292 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j9qmt-0001rX-7Q for qemu-devel@archiver.kernel.org; Thu, 05 Mar 2020 08:43:43 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:53244) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j9qm3-0001GI-V7 for qemu-devel@nongnu.org; Thu, 05 Mar 2020 08:42:53 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j9qm1-0004Hi-IC for qemu-devel@nongnu.org; Thu, 05 Mar 2020 08:42:51 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:29075 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1j9qm1-0004HQ-Er for qemu-devel@nongnu.org; Thu, 05 Mar 2020 08:42:49 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1583415769; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5U1jcN4sA13f/aT+uXQIVD4ub6a//UX3n63FTLnQIKA=; b=IxRfGW/6cUSkfVLs8Jj5yyYHRvDuVv4kn/RqNSH3rxtN1+els7abqNgL40lIrTpvQ4k22v 17QNO6qKHTHu1G8g+jBl6p4k5KQsTh804D6VseoYu2nI1yfArXOZNrKI375WO8npEw/R/8 /TbD1dH2yMIuA8T79EeG5/id9lHbfpw= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-27-WahPDiqmMo6_5GYbq1j_7A-1; Thu, 05 Mar 2020 08:42:39 -0500 X-MC-Unique: WahPDiqmMo6_5GYbq1j_7A-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5418C800D5A; Thu, 5 Mar 2020 13:42:38 +0000 (UTC) Received: from redhat.com (ovpn-112-77.ams2.redhat.com [10.36.112.77]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C15D273890; Thu, 5 Mar 2020 13:42:32 +0000 (UTC) Date: Thu, 5 Mar 2020 13:42:29 +0000 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= Subject: Re: [PATCH v2 0/9] hw, ui, virtfs-proxy-helper: Reduce QEMU .data/.rodata/.bss footprint Message-ID: <20200305134229.GB2112347@redhat.com> References: <20200305124525.14555-1-philmd@redhat.com> MIME-Version: 1.0 In-Reply-To: <20200305124525.14555-1-philmd@redhat.com> User-Agent: Mutt/1.13.3 (2020-01-12) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 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: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Cc: Dmitry Fleytman , qemu-trivial@nongnu.org, Jason Wang , Christian Schoenebeck , qemu-devel@nongnu.org, Greg Kurz , Gerd Hoffmann , Stefano Garzarella Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Thu, Mar 05, 2020 at 01:45:16PM +0100, Philippe Mathieu-Daud=C3=A9 wrote= : > Since v1: > - merged 2 series > - reworked hw/usb/quirks > - added R-b/A-b tags >=20 > This series reduce the footprint of the QEMU binary: > .bss: 106KiB (moved to .heap) Did this actually have an impact on the binary size, or just on the size the elf-dissector reports ? I'm not very familiar with ELF, but Wikipedia's description of BSS makes me question it... "Typically only the length of the bss section, but no data,=20 is stored in the object file. The program loader allocates=20 memory for the bss section when it loads the program. On some platforms, some or all of the bss section is initialized to zeroes. Unix-like systems and Windows initialize the bss=20 section to zero" This suggests .bss has no on-disk overhead, only runtime overhead, which is presumably going to be the same with heap allocations. > .data: 1MiB > .rodata: 4.34MiB These looks useful though in terms of disk footprint. > (sizes on x86_64 building with -Os) >=20 > The elf-dissector tool [1] [2] helped to notice the big array. >=20 > [1] https://phabricator.kde.org/source/elf-dissector/ > [2] https://www.volkerkrause.eu/2019/06/22/elf-dissector-aarch64-support.= html > [heap equivalent tool working with QEMU: https://github.com/KDE/heaptrack= ] >=20 > Supersedes: <20200304221807.25212-1-philmd@redhat.com> > Supersedes: <20200305010446.17029-1-philmd@redhat.com> >=20 > Philippe Mathieu-Daud=C3=A9 (9): > hw/audio/fmopl: Fix a typo twice > hw/audio/fmopl: Move ENV_CURVE to .heap to save 32KiB of .bss > hw/audio/intel-hda: Use memory region alias to reduce .rodata by > 4.34MB > hw/net/e1000: Add readops/writeops typedefs > hw/net/e1000: Move macreg[] arrays to .rodata to save 1MiB of .data > hw/usb/quirks: Use smaller types to reduce .rodata by 10KiB > ui/curses: Make control_characters[] array const > ui/curses: Move arrays to .heap to save 74KiB of .bss > virtfs-proxy-helper: Make the helper_opts[] array const >=20 > hw/usb/quirks.h | 22 +++++++++++++--------- > fsdev/virtfs-proxy-helper.c | 2 +- > hw/audio/fmopl.c | 8 +++++--- > hw/audio/intel-hda.c | 24 ++++++++++-------------- > hw/net/e1000.c | 6 ++++-- > hw/net/e1000e_core.c | 6 ++++-- > hw/usb/quirks.c | 4 ++-- > ui/curses.c | 10 +++++++--- > 8 files changed, 46 insertions(+), 36 deletions(-) >=20 > --=20 > 2.21.1 >=20 >=20 Regards, Daniel --=20 |: https://berrange.com -o- https://www.flickr.com/photos/dberrange= :| |: https://libvirt.org -o- https://fstop138.berrange.com= :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange= :|