From nobody Mon Feb 9 06:00:47 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1569423908; cv=none; d=zoho.com; s=zohoarc; b=khZzwbrL7rSliZ2BfNDr3Hfiq4M4MDfB5n97jp2fQhVazQRCOlYX2AppCCxoNA2H9ywNDckk5zRE1dGbkQlphy6Tk7mmw92GNBW0+rled3fusD2gnNYI6GnMQrZT8y/zG2eAU3UXGDqQyfcpWoeFrE7r91r1WWrkefKMNxDcp68= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1569423908; h=Content-Transfer-Encoding:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=qyiDyfTK9hAdqd2zaiihSOS40G6cslJnkWfIO581g1A=; b=cU8p20k5dyZiOU2tkj2aYkJLAATY69LdjvOVy/S0B0bWc1z1VuUzyVWRQJthJEC/HHySuQAWXmb+rdlTZcGqUINe1UcgyckyKngO8cbK787xUjFKWEcAZd32ed1iH0bUQkj84jwYfSmsVu+4oQnkSvIUQFPMN9peoFWCnne97G4= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1569423908702186.67277958077295; Wed, 25 Sep 2019 08:05:08 -0700 (PDT) Received: from localhost ([::1]:53354 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iD8qm-0003CP-I5 for importer@patchew.org; Wed, 25 Sep 2019 11:05:04 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:57571) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iD8nc-0000c0-2O for qemu-devel@nongnu.org; Wed, 25 Sep 2019 11:01:49 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iD8na-0004ZK-TY for qemu-devel@nongnu.org; Wed, 25 Sep 2019 11:01:47 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35556) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iD8na-0004Yo-O4 for qemu-devel@nongnu.org; Wed, 25 Sep 2019 11:01:46 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 008F0306731D; Wed, 25 Sep 2019 15:01:46 +0000 (UTC) Received: from dgilbert-t580.localhost (ovpn-117-251.ams2.redhat.com [10.36.117.251]) by smtp.corp.redhat.com (Postfix) with ESMTP id B3DD15C21F; Wed, 25 Sep 2019 15:01:40 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, quintela@redhat.com, peterx@redhat.com, marcandre.lureau@redhat.com, richardw.yang@linux.intel.com, alex.benee@linaro.org Subject: [PULL 2/9] migration/postcopy: not necessary to do discard when canonicalizing bitmap Date: Wed, 25 Sep 2019 16:01:23 +0100 Message-Id: <20190925150130.12303-3-dgilbert@redhat.com> In-Reply-To: <20190925150130.12303-1-dgilbert@redhat.com> References: <20190925150130.12303-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.48]); Wed, 25 Sep 2019 15:01:46 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" From: Wei Yang All pages, either partially sent or partially dirty, will be discarded in postcopy_send_discard_bm_ram(), since we update the unsentmap to be unsentmap =3D unsentmap | dirty in ram_postcopy_send_discard_bitmap(). This is not necessary to do discard when canonicalizing bitmap. And by doing so, we separate the page discard into two individual steps: * canonicalize bitmap * discard page Signed-off-by: Wei Yang Message-Id: <20190819061843.28642-2-richardw.yang@linux.intel.com> Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Dr. David Alan Gilbert --- migration/ram.c | 14 +------------- 1 file changed, 1 insertion(+), 13 deletions(-) diff --git a/migration/ram.c b/migration/ram.c index 01df326767..57d1a4627e 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -2928,7 +2928,7 @@ static int postcopy_each_ram_send_discard(MigrationSt= ate *ms) } =20 /** - * postcopy_chunk_hostpages_pass: canocalize bitmap in hostpages + * postcopy_chunk_hostpages_pass: canonicalize bitmap in hostpages * * Helper for postcopy_chunk_hostpages; it's called twice to * canonicalize the two bitmaps, that are similar, but one is @@ -2991,18 +2991,6 @@ static void postcopy_chunk_hostpages_pass(MigrationS= tate *ms, bool unsent_pass, host_ratio); run_start =3D QEMU_ALIGN_UP(run_start, host_ratio); =20 - /* Tell the destination to discard this page */ - if (unsent_pass || !test_bit(fixup_start_addr, unsentmap)) { - /* For the unsent_pass we: - * discard partially sent pages - * For the !unsent_pass (dirty) we: - * discard partially dirty pages that were sent - * (any partially sent pages were already discarded - * by the previous unsent_pass) - */ - postcopy_discard_send_range(ms, fixup_start_addr, host_rat= io); - } - /* Clean up the bitmap */ for (page =3D fixup_start_addr; page < fixup_start_addr + host_ratio; page++) { --=20 2.21.0