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=-0.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 A5885C3F2C6 for ; Tue, 10 Mar 2020 13:17:01 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id 360C62467D for ; Tue, 10 Mar 2020 13:17:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="Dyd17xpV" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 360C62467D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id F11364A597; Tue, 10 Mar 2020 09:16:59 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@kernel.org Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6UFYi-HXDADr; Tue, 10 Mar 2020 09:16:59 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 07ED94A4E5; Tue, 10 Mar 2020 09:16:59 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id F181C4A4AA for ; Tue, 10 Mar 2020 09:16:57 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id NQv0xt-e11L1 for ; Tue, 10 Mar 2020 09:16:57 -0400 (EDT) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 06D9640A52 for ; Tue, 10 Mar 2020 09:16:56 -0400 (EDT) Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9503E24693; Tue, 10 Mar 2020 13:16:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583846215; bh=CiF2e4Gu3MUdh7Lg3zur4QzwVBU4lRXnHY3VzJVyY/4=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=Dyd17xpVF0JxkmyH3agz6PA0jQ9JY+cKzy37NP2xJREQyR1k4eYVBwOMm3QBwZafZ 78doEykwC9a3jiy++aeUHd2sjMmBr52uxv6lUDfQzWrsO5rzavgL7Be86zUEPOKaZw rwwyMfDKk9vYKGWvUHcwjyAXo+h3EcV1GpDqMlbg= Received: from disco-boy.misterjones.org ([51.254.78.96] helo=www.loen.fr) by disco-boy.misterjones.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1jBekf-00Bb9d-VK; Tue, 10 Mar 2020 13:16:54 +0000 MIME-Version: 1.0 Date: Tue, 10 Mar 2020 13:16:53 +0000 From: Marc Zyngier To: zhukeqian Subject: Re: [RFC] KVM: arm64: support enabling dirty log graually in small chunks In-Reply-To: <64925c8b-af3d-beb5-bc9b-66ef1e47f92d@huawei.com> References: <20200309085727.1106-1-zhukeqian1@huawei.com> <4b85699ec1d354cc73f5302560231f86@misterjones.org> <64925c8b-af3d-beb5-bc9b-66ef1e47f92d@huawei.com> Message-ID: X-Sender: maz@kernel.org User-Agent: Roundcube Webmail/1.3.10 X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: zhukeqian1@huawei.com, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, jianjay.zhou@huawei.com, sean.j.christopherson@intel.com, pbonzini@redhat.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Sean Christopherson , Jay Zhou , Paolo Bonzini , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On 2020-03-10 08:26, zhukeqian wrote: > Hi Marc, > > On 2020/3/9 19:45, Marc Zyngier wrote: >> Kegian, [...] >> Is there a userspace counterpart to it? >> > As this KVM/x86 related changes have not been merged to mainline > kernel, some little modification is needed on mainline Qemu. Could you please point me to these changes? > As I tested this patch on a 128GB RAM Linux VM with no huge pages, the > time of enabling dirty log will decrease obviously. I'm not sure how realistic that is. Not having huge pages tends to lead to pretty bad performance in general... Thanks, M. -- Jazz is not dead. It just smells funny... _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm