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=-2.0 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_2 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 479B1C2D0B1 for ; Tue, 4 Feb 2020 11:18:55 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 157A520674 for ; Tue, 4 Feb 2020 11:18:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="N2kUPUP1" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 157A520674 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1iywDz-0002ZL-OY; Tue, 04 Feb 2020 11:18:35 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.89) (envelope-from ) id 1iywDx-0002YD-Ir for xen-devel@lists.xenproject.org; Tue, 04 Feb 2020 11:18:33 +0000 X-Inumbo-ID: 131f8ef8-4740-11ea-b211-bc764e2007e4 Received: from merlin.infradead.org (unknown [2001:8b0:10b:1231::1]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 131f8ef8-4740-11ea-b211-bc764e2007e4; Tue, 04 Feb 2020 11:18:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Mime-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=xPVqDnW5l1o7tFKYHX7llauuDgWvfj5cnI28JlGtoFA=; b=N2kUPUP1KVreTo+Gm6pOZ+XOe0 4k2MB+t5iS5rJnRQzqffhYx+/y7pp8W/8LD2anvlqTBUa6s0uII/fdK9OG4PYKdswo4/43RnHhLIB /yYWvH1GbyLuBO+hRqhwfGx7lrE+MC//jtxNzarnCbHdhyqugm8m6GQLH/DWTXlRsnuAjdBFTXiK9 ug5M8O/wpFB974rGZ997bQvYceYuk/B6FwIAs/Vw+MyKEzGQAyNsYuMW95oIiti64x1IMhP9jYVAM JoonABZ+OuhaLFwnBlLOYwsSbdflwrOQRnj1q308TFDWUJ7lcD7zqMs0KHA3069hOqQfjFtwG0nsK 8iDVSGZA==; Received: from 54-240-197-231.amazon.com ([54.240.197.231] helo=u3832b3a9db3152.ant.amazon.com) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1iywDd-0002mU-13; Tue, 04 Feb 2020 11:18:13 +0000 Message-ID: <5b0e45911cf159f4ef363f3f0b5016c2a2dac8ea.camel@infradead.org> From: David Woodhouse To: George Dunlap Date: Tue, 04 Feb 2020 11:18:09 +0000 In-Reply-To: References: <8a95f787ca93b23ee8d8c0b55fcc63d22a75c5f3.camel@infradead.org> <20200201003303.2363081-5-dwmw2@infradead.org> <4eb039f7-597c-cc07-3fa9-29b60646ae7e@xen.org> X-Mailer: Evolution 3.28.5-0ubuntu0.18.04.1 Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html Subject: Re: [Xen-devel] [PATCH 5/8] xen/vmap: allow vmap() to be called during early boot X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Stefano Stabellini , Julien Grall , Wei Liu , Konrad Rzeszutek Wilk , Andrew Cooper , Varad Gautam , Ian Jackson , Hongyan Xia , xen-devel , Paul Durrant , Roger Pau =?ISO-8859-1?Q?Monn=E9?= Content-Type: multipart/mixed; boundary="===============3085602659805906696==" Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" --===============3085602659805906696== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-Cr7hQjA7iQXs63s4YbT4" --=-Cr7hQjA7iQXs63s4YbT4 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2020-02-04 at 11:06 +0000, David Woodhouse wrote: >=20 > I still don't really get it. What if the zone boundary is at MFN 0x300? >=20 > What prevents the buddy allocator from merging a range a 0x200-0x2FF > with another from 0x300-0x3FF, creating a single range 0x200-0x400 > which crosses nodes? >=20 > The MFN0 trick only works if all zone boundaries must be at an address > which is 2=E2=81=BF, doesn't it? Is that always true? As yes, it is. And you called it out explicitly. Sorry. I think I was conflating NUMA nodes, with the allocator zones. On the plus side, this is a whole lot easier for the boot allocator to cope with. It's easy enough to avoid handing out any high-order allocations from the boot allocator which would cross a *zone* boundary. 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