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=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 B4CEEC33CA1 for ; Wed, 5 Feb 2020 09:49:34 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 76FED2082E for ; Wed, 5 Feb 2020 09:49:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 76FED2082E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 1B6A46B009F; Wed, 5 Feb 2020 04:49:34 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 167926B00A1; Wed, 5 Feb 2020 04:49:34 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 02DF36B00A2; Wed, 5 Feb 2020 04:49:33 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0110.hostedemail.com [216.40.44.110]) by kanga.kvack.org (Postfix) with ESMTP id DC8BF6B009F for ; Wed, 5 Feb 2020 04:49:33 -0500 (EST) Received: from smtpin27.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 80D67180AD802 for ; Wed, 5 Feb 2020 09:49:33 +0000 (UTC) X-FDA: 76455601026.27.dime79_190cf54f81f21 X-HE-Tag: dime79_190cf54f81f21 X-Filterd-Recvd-Size: 4565 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by imf13.hostedemail.com (Postfix) with ESMTP for ; Wed, 5 Feb 2020 09:49:31 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 05 Feb 2020 01:49:30 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,405,1574150400"; d="scan'208";a="404096271" Received: from fmsmsx105.amr.corp.intel.com ([10.18.124.203]) by orsmga005.jf.intel.com with ESMTP; 05 Feb 2020 01:49:30 -0800 Received: from fmsmsx608.amr.corp.intel.com (10.18.126.88) by FMSMSX105.amr.corp.intel.com (10.18.124.203) with Microsoft SMTP Server (TLS) id 14.3.439.0; Wed, 5 Feb 2020 01:49:29 -0800 Received: from fmsmsx608.amr.corp.intel.com (10.18.126.88) by fmsmsx608.amr.corp.intel.com (10.18.126.88) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Wed, 5 Feb 2020 01:49:28 -0800 Received: from shsmsx101.ccr.corp.intel.com (10.239.4.153) by fmsmsx608.amr.corp.intel.com (10.18.126.88) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.1.1713.5 via Frontend Transport; Wed, 5 Feb 2020 01:49:28 -0800 Received: from shsmsx102.ccr.corp.intel.com ([169.254.2.126]) by SHSMSX101.ccr.corp.intel.com ([169.254.1.222]) with mapi id 14.03.0439.000; Wed, 5 Feb 2020 17:49:27 +0800 From: "Wang, Wei W" To: David Hildenbrand , "Michael S. Tsirkin" CC: Nadav Amit , Alexander Duyck , Tyler Sanderson , "virtualization@lists.linux-foundation.org" , David Rientjes , "linux-mm@kvack.org" , "Michal Hocko" Subject: RE: Balloon pressuring page cache Thread-Topic: Balloon pressuring page cache Thread-Index: AQHV1jovoZrFI2PKjUOgo5GIAcuyoKgA6/YAgACRPICAAUzXAIAAibNg///JVwCABdc9AIAANGSAgAAETACAAGklgIAAo12AgAABfACAAGGxgIABj+gw//+atoCAAIwXoP//fmaAABDM2dD//3whAP//eIgwgACMLgD//3kPIIAAixeA//94o6A= Date: Wed, 5 Feb 2020 09:49:26 +0000 Message-ID: <286AC319A985734F985F78AFA26841F73E41F562@shsmsx102.ccr.corp.intel.com> References: <91270a68-ff48-88b0-219c-69801f0c252f@redhat.com> <20200203080520-mutt-send-email-mst@kernel.org> <5ac131de8e3b7fc1fafd05a61feb5f6889aeb917.camel@linux.intel.com> <539B606A-A0CA-4AA4-B99A-759C874A1EF8@vmware.com> <20200204033657-mutt-send-email-mst@kernel.org> <286AC319A985734F985F78AFA26841F73E41F0F0@shsmsx102.ccr.corp.intel.com> <1eff30a0-a38a-cd45-2fc1-80cfd0bf5f04@redhat.com> <286AC319A985734F985F78AFA26841F73E41F306@shsmsx102.ccr.corp.intel.com> <2b388a78-79cd-f99a-6f87-6446dcb4b819@redhat.com> <286AC319A985734F985F78AFA26841F73E41F367@shsmsx102.ccr.corp.intel.com> <605bef3e-373f-f39a-4849-930326564b5b@redhat.com> <286AC319A985734F985F78AFA26841F73E41F3DE@shsmsx102.ccr.corp.intel.com> <286AC319A985734F985F78AFA26841F73E41F490@shsmsx102.ccr.corp.intel.com> <5b184893-014c-35a1-928b-37b8f4647116@redhat.com> In-Reply-To: <5b184893-014c-35a1-928b-37b8f4647116@redhat.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-version: 11.2.0.6 dlp-reaction: no-action x-originating-ip: [10.239.127.40] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wednesday, February 5, 2020 5:37 PM, David Hildenbrand wrote: > > > > Not sure how TCG tracks the dirty bits. But In whatever > > implementation, the hypervisor should have >=20 > There is only a single bitmap for that purpose. (well, the one where KVM > syncs to) >=20 > > already dealt with the race between he current round and the previous > round dirty recording. > > (the race isn't brought by this feature essentially) >=20 > It is guaranteed to work reliably without this feature as you only clear = what > *has been migrated*,=20 Not "clear what has been migrated" (that skips nothing..) Anyway, it's a hint used for optimization. Best, Wei