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=-3.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=no 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 CD4D0C32771 for ; Thu, 9 Jan 2020 09:45:00 +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 94F2D206ED for ; Thu, 9 Jan 2020 09:45:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="OWRrmOqr" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 94F2D206ED 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]:57488 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ipUN9-0002O4-Pk for qemu-devel@archiver.kernel.org; Thu, 09 Jan 2020 04:44:59 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:36374) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ipUMU-0001wN-5T for qemu-devel@nongnu.org; Thu, 09 Jan 2020 04:44:19 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ipUMS-0000kG-W4 for qemu-devel@nongnu.org; Thu, 09 Jan 2020 04:44:17 -0500 Received: from us-smtp-2.mimecast.com ([207.211.31.81]:33649 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ipUMS-0000hI-P8 for qemu-devel@nongnu.org; Thu, 09 Jan 2020 04:44:16 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1578563056; 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=vLSqyyR7AcX0CQmCuyqsHUHujGC858FTBG6qOSkKufo=; b=OWRrmOqr8dAI9DA5qkNsLl3wGYmbix60audfL9Io1lGssalZvHRmVPElM2qOd9Itc+vExS ghszXmkCysOldF02LLW/XNu/ZXbBLmKAZQHbpmP1FqYIPlLQ+JQaYA9CYgg+MBABMXBjhf AG//OzjSMjZYSIwVvWq/0W5ZCp2LhBg= 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-365-NgFjt09PMBqxEMgOitfDZA-1; Thu, 09 Jan 2020 04:44:12 -0500 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D0AAC10054E3; Thu, 9 Jan 2020 09:44:11 +0000 (UTC) Received: from redhat.com (ovpn-116-22.ams2.redhat.com [10.36.116.22]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 65DD0272A3; Thu, 9 Jan 2020 09:44:11 +0000 (UTC) From: Juan Quintela To: Wei Yang Subject: Re: [Patch v2 6/6] migration/postcopy: enable compress during postcopy In-Reply-To: <20191107123907.29791-7-richardw.yang@linux.intel.com> (Wei Yang's message of "Thu, 7 Nov 2019 20:39:07 +0800") References: <20191107123907.29791-1-richardw.yang@linux.intel.com> <20191107123907.29791-7-richardw.yang@linux.intel.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) Date: Thu, 09 Jan 2020 10:44:09 +0100 Message-ID: <87zhexynfa.fsf@secure.laptop> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: NgFjt09PMBqxEMgOitfDZA-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain 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: 207.211.31.81 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: quintela@redhat.com Cc: dgilbert@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Wei Yang wrote: > postcopy requires to place a whole host page, while migration thread > migrate memory in target page size. This makes postcopy need to collect > all target pages in one host page before placing via userfaultfd. > > To enable compress during postcopy, there are two problems to solve: > > 1. Random order for target page arrival > 2. Target pages in one host page arrives without interrupt by target > page from other host page > > The first one is handled by previous cleanup patch. > > This patch handles the second one by: > > 1. Flush compress thread for each host page > 2. Wait for decompress thread for before placing host page > > Signed-off-by: Wei Yang > Reviewed-by: Dr. David Alan Gilbert Reviewed-by: Juan Quintela