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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 D359DC43381 for ; Mon, 1 Apr 2019 14:48:00 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 9455D20840 for ; Mon, 1 Apr 2019 14:48:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9455D20840 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 409006B0005; Mon, 1 Apr 2019 10:48:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 390076B0008; Mon, 1 Apr 2019 10:48:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2591C6B000A; Mon, 1 Apr 2019 10:48:00 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-qk1-f198.google.com (mail-qk1-f198.google.com [209.85.222.198]) by kanga.kvack.org (Postfix) with ESMTP id 00FF46B0005 for ; Mon, 1 Apr 2019 10:48:00 -0400 (EDT) Received: by mail-qk1-f198.google.com with SMTP id d8so8661280qkk.17 for ; Mon, 01 Apr 2019 07:47:59 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:date:from:to :cc:subject:message-id:references:mime-version:content-disposition :in-reply-to; bh=Nt8nCkiL/lmRXg5mImkQVFR8ydDkGxqOHtXpP9B9HMI=; b=nxXGooJI33q3OnJT/MHrJmJ80i6pX2rDEyo9NWT3ez6cNjgXRZEDo8wh31VjzMgS3q ECyfVSddScADl3cqFsZuJzko9DOM5WPe0lnLellAzTau2wi/sBPGFmZal8NeOazoP3GN cDDG9iGyloZkgY05Up4XFrunUcXiUxgQEkdRLUINMo9spJqFWHVjJK3MZVfQ3vtLCi7+ uMKQlTXJ1eDbqAHdd0sJLy9V6US937RKF4cJ1L5xG2PvFB8e4v+FKJ5JkZRSOj3ZWrds 5wb5vl5EpIyq7VJ3viZCkuAad4i7yH+eGNbeYJ3327l3KOzgUCb2cS+6XOweNR3NxPv4 GDKg== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of mst@redhat.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=mst@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com X-Gm-Message-State: APjAAAUupzbHI2I3AoCpitrsuPVFNP7plZj/tBYhO6fTHCb1xfAXmkCu RubEW6dhC1wijOgcWFcKEQqP+xZMAsrQTd/eLjMkJFGNtxbCJV2dq+lTe8/zIdo6vrg41zuCYYi lgD5Gy+mWGlWYVJcgdBtGpHWk1t8OcPfe6Y7UCwIFsrmptzhadI4/5/BumWXIbCx6Ng== X-Received: by 2002:a05:620a:1407:: with SMTP id d7mr47352563qkj.189.1554130079771; Mon, 01 Apr 2019 07:47:59 -0700 (PDT) X-Received: by 2002:a05:620a:1407:: with SMTP id d7mr47352537qkj.189.1554130079310; Mon, 01 Apr 2019 07:47:59 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1554130079; cv=none; d=google.com; s=arc-20160816; b=PtgH2/u9cdKlTnf+GImM/Wrb+eyyc5yT33w3LK7CUcTAVFnQp/pnaPHuvzVttu/X+W kQUJyt0hAjWsqHoqcW230QJ8u1EvYq5XAK5R7sY1iAT1Zks+UOfRO5BKEAApcYgpcUz7 031lRg2AzWAeKWB/oiZEQFIPSAqHqW3Rsblaoc4LjNTNrRxOKnaaAFvepuPYVHHK6hDu 0acYqOkT0p8xyb4uxjffYL7FUtCgESgQfY7+glX/2VVpgxbViRJYTz1Kp7w8yr/+o/lV 68VFvRnDQd5FKgX1KuExMcp3TrDAS2iiNyVz9hBVDaCs37C5Bib+1anzfjYYBbXpwxzu J4uA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date; bh=Nt8nCkiL/lmRXg5mImkQVFR8ydDkGxqOHtXpP9B9HMI=; b=HicGAAUgGnomWmtuzrcFTqglOGdrKApezmNt1yGcujrrSLmj7h1fVUFcs9bjyboGjr 77Drm5srjVOTEe4fQ80tAiz3Ule92vXs1Ydbd4g5VEbHpcVnOa0ky403pQrptVBoLhIj CxeGIKlj/KQlaQBq5zyZ/51ZzOfsDaRBp/VirDS/y2EdASQ52VRcoIWUIafVCVvFuHCM iWHC1kiHtYELSMkGhRh2HJxm5N+E8SOJx7wB09W5PWbdGHcxaWwhQya48ugzAeu21iaJ IrQv837IVYUCb063P+FIlSxMcSDRHcd5Q7KXFNTJmF8Pmvzh1ba1Lfqv0bWgMF0ZEQGJ yHzA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of mst@redhat.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=mst@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id u2sor10594621qvi.67.2019.04.01.07.47.59 for (Google Transport Security); Mon, 01 Apr 2019 07:47:59 -0700 (PDT) Received-SPF: pass (google.com: domain of mst@redhat.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; spf=pass (google.com: domain of mst@redhat.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=mst@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com X-Google-Smtp-Source: APXvYqwzMFehCXyKpzmyvfdZzFoZbM7plT1F+hAXxH2SANmhbRwnjoxXtZ7V+qdz4DDg0+b8E538ew== X-Received: by 2002:a0c:d1a6:: with SMTP id e35mr53515321qvh.174.1554130079126; Mon, 01 Apr 2019 07:47:59 -0700 (PDT) Received: from redhat.com (pool-173-76-246-42.bstnma.fios.verizon.net. [173.76.246.42]) by smtp.gmail.com with ESMTPSA id u16sm7752118qtc.84.2019.04.01.07.47.57 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 01 Apr 2019 07:47:58 -0700 (PDT) Date: Mon, 1 Apr 2019 10:47:56 -0400 From: "Michael S. Tsirkin" To: David Hildenbrand Cc: Nitesh Narayan Lal , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, pbonzini@redhat.com, lcapitulino@redhat.com, pagupta@redhat.com, wei.w.wang@intel.com, yang.zhang.wz@gmail.com, riel@surriel.com, dodgen@google.com, konrad.wilk@oracle.com, dhildenb@redhat.com, aarcange@redhat.com, alexander.duyck@gmail.com Subject: Re: On guest free page hinting and OOM Message-ID: <20190401104608-mutt-send-email-mst@kernel.org> References: <20190329084058-mutt-send-email-mst@kernel.org> <20190329104311-mutt-send-email-mst@kernel.org> <7a3baa90-5963-e6e2-c862-9cd9cc1b5f60@redhat.com> <20190329125034-mutt-send-email-mst@kernel.org> <20190401073007-mutt-send-email-mst@kernel.org> <29e11829-c9ac-a21b-b2f1-ed833e4ca449@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: 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 Mon, Apr 01, 2019 at 04:11:42PM +0200, David Hildenbrand wrote: > > The interesting thing is most probably: Will the hinting size usually be > > reasonable small? At least I guess a guest with 4TB of RAM will not > > suddenly get a hinting size of hundreds of GB. Most probably also only > > something in the range of 1GB. But this is an interesting question to > > look into. > > > > Also, if the admin does not care about performance implications when > > already close to hinting, no need to add the additional 1Gb to the ram size. > > "close to OOM" is what I meant. Problem is, host admin is the one adding memory. Guest admin is the one that knows about performance. > > -- > > Thanks, > > David / dhildenb