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=-3.5 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, 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 E3168C282DD for ; Wed, 8 Jan 2020 13:24:11 +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 A606D2067D for ; Wed, 8 Jan 2020 13:24:11 +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="DfcKe3FA" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A606D2067D 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]:43706 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ipBJi-0007CG-MW for qemu-devel@archiver.kernel.org; Wed, 08 Jan 2020 08:24:10 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:36052) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ipBIt-0006Kl-K6 for qemu-devel@nongnu.org; Wed, 08 Jan 2020 08:23:20 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ipBIs-0003iz-Mk for qemu-devel@nongnu.org; Wed, 08 Jan 2020 08:23:19 -0500 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:44787 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 1ipBIs-0003iY-Iv for qemu-devel@nongnu.org; Wed, 08 Jan 2020 08:23:18 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1578489797; 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=AD5r0SOSo1Lvdfs8qyaJgeYHLf02wmF2xJUOPkoDYXc=; b=DfcKe3FA0nmIkubI0bOpP6GLkAIcPaN339De+axFaDXiJj6tcUIhvYKKXbkBJhrBPt1IUX BnW/LVbHbHOVfuzYTwDleHmnYOhcaKldcUI4NBb0lSTWJyyoUGggqQY9g7wjf43N2XnCFx aDbRrT4Fra5hOTW1C2dC0NrRTS2koeE= 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-228-eRkhMmlKPvmHsNSS_WpiJQ-1; Wed, 08 Jan 2020 08:23:16 -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 55DBE1088387; Wed, 8 Jan 2020 13:23:15 +0000 (UTC) Received: from redhat.com (unknown [10.36.118.112]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 43A3819C69; Wed, 8 Jan 2020 13:23:13 +0000 (UTC) From: Juan Quintela To: Yury Kotov Subject: Re: [PATCH v2] migration/ram: Yield periodically to the main loop In-Reply-To: <20191125133632.21387-1-yury-kotov@yandex-team.ru> (Yury Kotov's message of "Mon, 25 Nov 2019 16:36:32 +0300") References: <20191125133632.21387-1-yury-kotov@yandex-team.ru> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) Date: Wed, 08 Jan 2020 14:23:10 +0100 Message-ID: <87imlmgk01.fsf@secure.laptop> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: eRkhMmlKPvmHsNSS_WpiJQ-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: 205.139.110.61 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: "open list:All patches CC here" , yc-core@yandex-team.ru, "Dr. David Alan Gilbert" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Yury Kotov wrote: > Usually, incoming migration coroutine yields to the main loop > while its IO-channel is waiting for data to receive. But there is a case > when RAM migration and data receive have the same speed: VM with huge > zeroed RAM. In this case, IO-channel won't read and thus the main loop > is stuck and for instance, it doesn't respond to QMP commands. > > For this case, yield periodically, but not too often, so as not to > affect the speed of migration. > > Signed-off-by: Yury Kotov Reviewed-by: Juan Quintela