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=unavailable 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 118F0C43381 for ; Thu, 7 Mar 2019 18:46:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DF47A20840 for ; Thu, 7 Mar 2019 18:46:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726514AbfCGSqV (ORCPT ); Thu, 7 Mar 2019 13:46:21 -0500 Received: from mail-qk1-f196.google.com ([209.85.222.196]:36572 "EHLO mail-qk1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726359AbfCGSqV (ORCPT ); Thu, 7 Mar 2019 13:46:21 -0500 Received: by mail-qk1-f196.google.com with SMTP id c2so9670214qkb.3 for ; Thu, 07 Mar 2019 10:46:20 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=2u7BP1Ui3tuNwWQLTQcvYHKSwz32ntxHiRkj8rks4cs=; b=JZeo5MsWGSp5drATuuD1bNMupyDR9wVk5FS4w6+1Pu8yxZCd6YmEetFqmHwfGQtI/0 CPU4yYp9/wLuFB6RoKA6jZWNr2jiA7BzVqB2mt55I4bee2ObhABez4pONdGeQvG8NWJb r0Of8DoPYJCN1N2mpEHIzo4G447qlj/hQYXg2iLGfm7L1M2nUtDeQbKcJOEgVklzPFxq 9ApPo1Qq0BNt2D44wTklNpgC3oEjku12wgqSjBogXM/6uqyRIEKODMhwJo2DWAM7HeMA jndMATLuu57JGSBLCjZNtWNBBxt3tw/WJpW8QsPZ+x5EN/8f7v/XhfjOOXfQZ3cOHjXp bk5w== X-Gm-Message-State: APjAAAUWPcUZeesVfzbcYmD4Ny5Y8JOMV0xolsgoEsn/YGdtdbXWJ1pI wnGPpmeGVxmjn9W9CFMtTq6FtA== X-Google-Smtp-Source: APXvYqwgo2MGDFDKita4Pt3kdeWKS1YwgR61gSXoAaqc66X2e+GMqH9GgtEtnl5cyDENN/P+vwyYrA== X-Received: by 2002:a37:b105:: with SMTP id a5mr10850516qkf.298.1551984380034; Thu, 07 Mar 2019 10:46:20 -0800 (PST) Received: from redhat.com (pool-173-76-246-42.bstnma.fios.verizon.net. [173.76.246.42]) by smtp.gmail.com with ESMTPSA id h52sm3711686qte.78.2019.03.07.10.46.17 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 07 Mar 2019 10:46:18 -0800 (PST) Date: Thu, 7 Mar 2019 13:46:16 -0500 From: "Michael S. Tsirkin" To: Alexander Duyck Cc: 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 , David Hildenbrand , dodgen@google.com, Konrad Rzeszutek Wilk , dhildenb@redhat.com, Andrea Arcangeli Subject: Re: [RFC][Patch v9 0/6] KVM: Guest Free Page Hinting Message-ID: <20190307134455-mutt-send-email-mst@kernel.org> References: <20190306155048.12868-1-nitesh@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Mar 06, 2019 at 10:00:05AM -0800, Alexander Duyck wrote: > I have been thinking about this. Instead of stealing the page couldn't > you simply flag it that there is a hint in progress and simply wait in > arch_alloc_page until the hint has been processed? The problem is in > stealing pages you are going to introduce false OOM issues when the > memory isn't available because it is being hinted on. Can we not give them back in an OOM notifier? -- MST