From nobody Mon Feb 9 09:33:54 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.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 Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1643398515688889.2161723465258; Fri, 28 Jan 2022 11:35:15 -0800 (PST) Received: from localhost ([::1]:50696 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nDX1e-0004P2-QR for importer@patchew.org; Fri, 28 Jan 2022 14:35:14 -0500 Received: from eggs.gnu.org ([209.51.188.92]:48718) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nDW9U-0001Fw-SM for qemu-devel@nongnu.org; Fri, 28 Jan 2022 13:39:24 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:44151) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nDW9G-0001wE-2O for qemu-devel@nongnu.org; Fri, 28 Jan 2022 13:39:04 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-571-C76gh4zXNIGJu3sBFhUVlA-1; Fri, 28 Jan 2022 13:38:56 -0500 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 833431091DA0; Fri, 28 Jan 2022 18:38:53 +0000 (UTC) Received: from secure.mitica (unknown [10.39.194.185]) by smtp.corp.redhat.com (Postfix) with ESMTP id 82A8812E25; Fri, 28 Jan 2022 18:38:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1643395139; h=from:from: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=ZEDHjNn5660tKa3OsoWZdLmqD8eE6Y5+2rpz+s3JKVA=; b=RlwBfxAvdxB1sP/rBA25NC/ESsKX38ZZxychUQgoBR4NykvVE/v4SCazHwSldoR+ujydQX m7M4dVqlju68nlZnAbl1ZENZTZM9imbheYN9b5zljYxRxPvLOxfpwUzKp3LVqMpUmfhX6T tcglVvffNLRs2T62Q67aVKnDKaCB/4M= X-MC-Unique: C76gh4zXNIGJu3sBFhUVlA-1 From: Juan Quintela To: qemu-devel@nongnu.org Subject: [PULL 26/36] migration: Drop postcopy_chunk_hostpages() Date: Fri, 28 Jan 2022 19:30:23 +0100 Message-Id: <20220128183033.31998-27-quintela@redhat.com> In-Reply-To: <20220128183033.31998-1-quintela@redhat.com> References: <20220128183033.31998-1-quintela@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=quintela@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.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; Received-SPF: pass client-ip=170.10.129.124; envelope-from=quintela@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -10 X-Spam_score: -1.1 X-Spam_bar: - X-Spam_report: (-1.1 / 5.0 requ) DKIMWL_WL_HIGH=-0.167, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Fam Zheng , Peter Maydell , "Michael S. Tsirkin" , Jason Wang , Mark Cave-Ayland , Peter Xu , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Gerd Hoffmann , Ani Sinha , "Edgar E. Iglesias" , Eric Blake , Hannes Reinecke , Vikram Garhwal , qemu-block@nongnu.org, Juan Quintela , Daniel Henrique Barboza , Markus Armbruster , Artyom Tarasenko , Pavel Pisa , Alistair Francis , "Dr. David Alan Gilbert" , Greg Kurz , qemu-arm@nongnu.org, =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Igor Mammedov , Stafford Horne , David Gibson , Laurent Vivier , Andrew Baumann , qemu-ppc@nongnu.org, Paolo Bonzini , Aurelien Jarno Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1643398518142100003 Content-Type: text/plain; charset="utf-8" From: Peter Xu This function calls three functions: - postcopy_discard_send_init(ms, block->idstr); - postcopy_chunk_hostpages_pass(ms, block); - postcopy_discard_send_finish(ms); However only the 2nd function call is meaningful. It's major role is to ma= ke sure dirty bits are applied in host-page-size granule, so there will be no partial dirty bits set for a whole host page if huge pages are used. The 1st/3rd call are for latter when we want to send the disgard ranges. They're mostly no-op here besides some tracepoints (which are misleading!). Drop them, then we can directly drop postcopy_chunk_hostpages() as a whole because we can call postcopy_chunk_hostpages_pass() directly. There're still some nice comments above postcopy_chunk_hostpages() that exp= lain what it does. Copy it over to the caller's site. Signed-off-by: Peter Xu Reviewed-by: Dr. David Alan Gilbert Reviewed-by: Juan Quintela Signed-off-by: Juan Quintela --- migration/ram.c | 33 +++++++-------------------------- 1 file changed, 7 insertions(+), 26 deletions(-) diff --git a/migration/ram.c b/migration/ram.c index c60cf5ad83..91d32002e8 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -2557,30 +2557,6 @@ static void postcopy_chunk_hostpages_pass(MigrationS= tate *ms, RAMBlock *block) } } =20 -/** - * postcopy_chunk_hostpages: discard any partially sent host page - * - * Utility for the outgoing postcopy code. - * - * Discard any partially sent host-page size chunks, mark any partially - * dirty host-page size chunks as all dirty. In this case the host-page - * is the host-page for the particular RAMBlock, i.e. it might be a huge p= age - * - * @ms: current migration state - * @block: block we want to work with - */ -static void postcopy_chunk_hostpages(MigrationState *ms, RAMBlock *block) -{ - postcopy_discard_send_init(ms, block->idstr); - - /* - * Ensure that all partially dirty host pages are made fully dirty. - */ - postcopy_chunk_hostpages_pass(ms, block); - - postcopy_discard_send_finish(ms); -} - /** * ram_postcopy_send_discard_bitmap: transmit the discard bitmap * @@ -2612,8 +2588,13 @@ int ram_postcopy_send_discard_bitmap(MigrationState = *ms) rs->last_page =3D 0; =20 RAMBLOCK_FOREACH_NOT_IGNORED(block) { - /* Deal with TPS !=3D HPS and huge pages */ - postcopy_chunk_hostpages(ms, block); + /* + * Deal with TPS !=3D HPS and huge pages. It discard any partiall= y sent + * host-page size chunks, mark any partially dirty host-page size + * chunks as all dirty. In this case the host-page is the host-pa= ge + * for the particular RAMBlock, i.e. it might be a huge page. + */ + postcopy_chunk_hostpages_pass(ms, block); } trace_ram_postcopy_send_discard_bitmap(); =20 --=20 2.34.1