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 1AEB6C4360F for ; Thu, 4 Apr 2019 13:28:44 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id CC381206B7 for ; Thu, 4 Apr 2019 13:28:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CC381206B7 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 7CA366B0003; Thu, 4 Apr 2019 09:28:43 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 74F016B0005; Thu, 4 Apr 2019 09:28:43 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6178B6B0006; Thu, 4 Apr 2019 09:28:43 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-qt1-f197.google.com (mail-qt1-f197.google.com [209.85.160.197]) by kanga.kvack.org (Postfix) with ESMTP id 3C7F56B0003 for ; Thu, 4 Apr 2019 09:28:43 -0400 (EDT) Received: by mail-qt1-f197.google.com with SMTP id p26so2195002qtq.21 for ; Thu, 04 Apr 2019 06:28:43 -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=7yyf+HgxleLYBHaKJbIu80u0jEokOC4UH8AehtEvcEM=; b=TSoB0i/1RgNwkE9gj1bmKZ99rbh3edAUKZFJS+m86Qu59XEVjvSIwHHIKAZyYWZpBz jNoH5siVIJq+DfBXCzTz5iPEr8l4ad+PQjhK/2tDzJCV6sFSpdEVHSby5lWqfhhxxFw5 d2OPhyC3ecohvYK8y/Afeu73ZDjUrcDRA33AQXCKWlf7wkf9dqGkJOXdIAeEYOMRj8yy EOVajyH1SesvkFyGs6+H55nQKpN7saUiqgzCGyFzslaLKVByS7RUc9yRiRZM77lgQg0V gqo7Hnal7qSBNsQPV90ZDNJccZnIUQkrlsqBuGVo1ysn94Aqb/eg+LPUlsYjP5m02Ka/ Gx1g== 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: APjAAAXpyaXdUDYYWMHUT1tme+1vM11ONaENi9KGFzv1Geljk/UfzmvP oKWiYF2bQbc1gSTzJyEZUGxpROhjfreVyje6sBeFcjkAI8zIMvlyrDzWJ9JfDHa5453tdaAFl+2 SmID/sCrNrBEqCQ67nz+SdPlP6yuLKVB5lI9gptrIuAjxHKeRAtRcZgRvTFP5mRpNiQ== X-Received: by 2002:ac8:35ea:: with SMTP id l39mr5507888qtb.151.1554384523060; Thu, 04 Apr 2019 06:28:43 -0700 (PDT) X-Received: by 2002:ac8:35ea:: with SMTP id l39mr5507837qtb.151.1554384522357; Thu, 04 Apr 2019 06:28:42 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1554384522; cv=none; d=google.com; s=arc-20160816; b=RpCKq9QM8cD/q+ECIKd+pX0p6+RY1th/KPl0y5onOL+olTFwG8l8ppDl9xBKJ+RrhR vT11eZBj3LYNXesVBhFDHTK7GNvyLpSKsGiWAE5oZZ0aRWDmUTZMIpU0SbNhahMmr108 2GTEbXHibyz3avZtGZMgCgI9y1vdFaAwGV65V67c8YCxZBRXAgISq8/3OfhTy+yCl/fE JyJjVJ6RKzAPf+MJOOwSWr4H7Ie0+EorpZOb8mNL9xZPqfz2pjxr3gCOWs1YWQE1OPvY uaqYJXneAMEfMgwrVk5aVNcz7Knm8o/Oh8Ge+sPm7syW0JeQc9UE4AmSBH1tD0EU7WPK bJ0g== 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=7yyf+HgxleLYBHaKJbIu80u0jEokOC4UH8AehtEvcEM=; b=uvcsqv/izbgnYAzGnwOdoI0CNdu2GTeBDY4GAzyHlAGombHH0Y8ro9Q+ToMwXr486Q YJtzwX/smc4ehSVPe5xMkou0949FLmR2ugMrLe+kC6gg42QnWw0Rbj+eqEa5uV8aIhMT i5B9DVz6gkiLWUEgbn5gCGzKp2WaHOmr7I/ycHm4E528Pd7zomcaQNQwwErfMJVZZ9Bw 5JU2Q/mIVpxXVdBx9ts9+64QShHLcSW8F+ZohKdDN/KKaE71ODn2vGMSXIKqTx063kBY 7m4ilBFzczgG065+Q77QbRPVBEaldjcQSwXMA1i+0QHceUax16q6dzgdrX8fZdf5dgqf Bq5Q== 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 55sor26390686qtu.34.2019.04.04.06.28.42 for (Google Transport Security); Thu, 04 Apr 2019 06:28:42 -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: APXvYqyGfRXpzQFNaSliZNlz6/G8SzOU+HMRc8xYFoGZ0ZQbt0QhYGmCO8b8oYZ6Q0w9Htvlju38sw== X-Received: by 2002:ac8:28e9:: with SMTP id j38mr5244597qtj.297.1554384522144; Thu, 04 Apr 2019 06:28:42 -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 q51sm12443768qtc.38.2019.04.04.06.28.39 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 04 Apr 2019 06:28:41 -0700 (PDT) Date: Thu, 4 Apr 2019 09:28:38 -0400 From: "Michael S. Tsirkin" To: Alexander Duyck Cc: David Hildenbrand , Nitesh Narayan Lal , kvm list , LKML , linux-mm , Paolo Bonzini , lcapitulino@redhat.com, pagupta@redhat.com, wei.w.wang@intel.com, Yang Zhang , Rik van Riel , dodgen@google.com, Konrad Rzeszutek Wilk , dhildenb@redhat.com, Andrea Arcangeli Subject: Re: On guest free page hinting and OOM Message-ID: <20190404083321-mutt-send-email-mst@kernel.org> References: <29e11829-c9ac-a21b-b2f1-ed833e4ca449@redhat.com> <20190401104608-mutt-send-email-mst@kernel.org> <6a612adf-e9c3-6aff-3285-2e2d02c8b80d@redhat.com> <1249f9dd-d22d-9e19-ee33-767581a30021@redhat.com> <0fdc41fb-b2ba-c6e6-36b9-97ad5a6eb54c@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 Tue, Apr 02, 2019 at 04:43:03PM -0700, Alexander Duyck wrote: > Yes, but hopefully it should be a small enough amount that nobody will > notice. In many cases devices such as NICs can consume much more than > this regularly for just their Rx buffers and it is not an issue. There > has to be a certain amount of overhead that any given device is > allowed to consume. If we contain the balloon hinting to just 64M that > should be a small enough amount that nobody would notice in practice. I am still inclined to add ability for balloon to exit to host on OOM if any hints are outstanding. If nothing else will be helpful for stats. -- MST