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 36810ECE58D for ; Fri, 11 Oct 2019 23:42:11 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 03D462084C for ; Fri, 11 Oct 2019 23:42:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 03D462084C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=canonical.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id A14556B0006; Fri, 11 Oct 2019 19:42:10 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 9C46C6B0007; Fri, 11 Oct 2019 19:42:10 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8DA886B0008; Fri, 11 Oct 2019 19:42:10 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0080.hostedemail.com [216.40.44.80]) by kanga.kvack.org (Postfix) with ESMTP id 6B0CC6B0006 for ; Fri, 11 Oct 2019 19:42:10 -0400 (EDT) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with SMTP id 0AD313811 for ; Fri, 11 Oct 2019 23:42:10 +0000 (UTC) X-FDA: 76033129620.22.plant19_2ff6f7a483138 X-HE-Tag: plant19_2ff6f7a483138 X-Filterd-Recvd-Size: 3267 Received: from youngberry.canonical.com (youngberry.canonical.com [91.189.89.112]) by imf33.hostedemail.com (Postfix) with ESMTP for ; Fri, 11 Oct 2019 23:42:09 +0000 (UTC) Received: from mail-wm1-f72.google.com ([209.85.128.72]) by youngberry.canonical.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1iJ4Xw-0001ZB-4P for linux-mm@kvack.org; Fri, 11 Oct 2019 23:42:08 +0000 Received: by mail-wm1-f72.google.com with SMTP id o188so4823473wmo.5 for ; Fri, 11 Oct 2019 16:42:08 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=92pEGUqS/S/KSPp9bTMahlMDEufG25vdMFkXaZGplCE=; b=ClAa1CalUDuuQTPi/RjNIjltdyeh9G6y+3LzhMnCZ07/wGfDS7Q0kYKdBslwcRQQop R2k3DOlI6nJcy2f/qDl830tDiehNgNX2EUtFfNYbtd3grqN+HRX1OiscQC2xpqybGhMc tMSXGYbOh8+CZrcc4bPOq8NV2G/6Crk3BBoceo2fmFWGowqKllR+K4m5WtPrvXm8qtsB yUVhZukwEV38UG2goI6F9Jv1qhtf13T57RRltm96oGHTX3rtZF8kYKjqT83P8z+Vl+6h 6QjzvFbupvwZlENnhlMfyWlE4/t/wnjJcg3FWsvjS9rB2Nlbb6J3ACJiGRMy8cwnopzX upLQ== X-Gm-Message-State: APjAAAXJ4zpOpWFSRz+0m+iRfCCNMeNVkYlEhVwjOcmkFsItmtLQngdM +u1EnIFyKA+vB6HybsQSf7b5ygcifCbbPNx7if54Xf4ri4tJ8KtaE4Ugx2ki0tpuCfizwvVnUCt qtl5ZiGT0ofx1YGoEUi7sEF2FFDvIZAj6eA1D9lKyni+T X-Received: by 2002:a1c:6a05:: with SMTP id f5mr5125925wmc.121.1570837327878; Fri, 11 Oct 2019 16:42:07 -0700 (PDT) X-Google-Smtp-Source: APXvYqylQm8kBOrJN1wK3uuE1r9eFdnGsE1vLFTpvB9yJbMEzLxNJu9inthxOqwtdtx/wsxR+hw/CoX8TYXgKJlpkc0= X-Received: by 2002:a1c:6a05:: with SMTP id f5mr5125908wmc.121.1570837327692; Fri, 11 Oct 2019 16:42:07 -0700 (PDT) MIME-Version: 1.0 References: <20191011223955.1435-1-gpiccoli@canonical.com> <36C2B5DF-7F21-42C6-BA77-6D86EDCB6BB3@lca.pw> In-Reply-To: <36C2B5DF-7F21-42C6-BA77-6D86EDCB6BB3@lca.pw> From: Guilherme Piccoli Date: Fri, 11 Oct 2019 20:41:31 -0300 Message-ID: Subject: Re: [PATCH] hugetlb: Add nohugepages parameter to prevent hugepages creation To: Qian Cai Cc: linux-mm@kvack.org, mike.kravetz@oracle.com, linux-kernel@vger.kernel.org, Jay Vosburgh , "Guilherme G. Piccoli" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.014287, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Oct 11, 2019 at 8:36 PM Qian Cai wrote: > > Typically, kdump kernel has its own initramfs, and don=E2=80=99t even nee= d to mount a rootfs, so I can=E2=80=99t see how sysfs/sysctl is relevant he= re. Thanks for the quick response. Kdump in Ubuntu, for example, rely in mounting the root filesystem. Even in initrd-only approaches, we could have sysctl.conf being copied to initramfs, and hugepages end-up getting set. Also, I don't think the "nohugepages" is useful only for kdump - I found odd we cannot prevent the creation of hugepages at all when using sysfs writes. Cheers, Guilherme