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=-3.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 0BF4ECA9EAF for ; Mon, 21 Oct 2019 21:24:41 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id BF3372084C for ; Mon, 21 Oct 2019 21:24:40 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="lr0DG/CM" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BF3372084C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nvidia.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 6E75A6B0005; Mon, 21 Oct 2019 17:24:40 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6A4676B0007; Mon, 21 Oct 2019 17:24:40 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 537B36B0007; Mon, 21 Oct 2019 17:24:40 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0106.hostedemail.com [216.40.44.106]) by kanga.kvack.org (Postfix) with ESMTP id 2A3826B0005 for ; Mon, 21 Oct 2019 17:24:40 -0400 (EDT) Received: from smtpin06.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id C6B428249980 for ; Mon, 21 Oct 2019 21:24:39 +0000 (UTC) X-FDA: 76069071078.06.stick70_b8eb1eb3c749 X-HE-Tag: stick70_b8eb1eb3c749 X-Filterd-Recvd-Size: 3191 Received: from hqemgate14.nvidia.com (hqemgate14.nvidia.com [216.228.121.143]) by imf02.hostedemail.com (Postfix) with ESMTP for ; Mon, 21 Oct 2019 21:24:39 +0000 (UTC) Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqemgate14.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Mon, 21 Oct 2019 14:24:43 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Mon, 21 Oct 2019 14:24:37 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Mon, 21 Oct 2019 14:24:37 -0700 Received: from HQMAIL101.nvidia.com (172.20.187.10) by HQMAIL111.nvidia.com (172.20.187.18) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Mon, 21 Oct 2019 21:24:37 +0000 Received: from hqnvemgw03.nvidia.com (10.124.88.68) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Mon, 21 Oct 2019 21:24:37 +0000 Received: from blueforge.nvidia.com (Not Verified[10.110.48.28]) by hqnvemgw03.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Mon, 21 Oct 2019 14:24:37 -0700 From: John Hubbard To: Andrew Morton CC: Keith Busch , LKML , , , John Hubbard Subject: [PATCH 0/1] mm/gup_benchmark: fix MAP_HUGETLB case Date: Mon, 21 Oct 2019 14:24:34 -0700 Message-ID: <20191021212435.398153-1-jhubbard@nvidia.com> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable Content-Type: text/plain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1571693083; bh=wu/SMv1VjPJ5GhwwryKc/x1EceeeDVg2bDlxgVqD7SA=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: MIME-Version:X-NVConfidentiality:Content-Transfer-Encoding: Content-Type; b=lr0DG/CMWSKkIRrB6/PQUu74DTjBkutvIoEjyJ7e9I+xY3sg+OdVB28hD/TxYTG6f LinV6bhwqOFcLYnYe5T8TdST9BpSdwaHDLIafrscXs9ylWZ75pFW93dGUKBnAkApWr ewDAEVu1T4yb1ojcafsT8t6V5UtSMkPw8dwC3Eh2/Vi+yt4sCvJTXEYpJQB5oujFfi es8YKQ40DWXvdq8RKvn+WLc2PLfGFilDMn4b82pmQt0z7usL/ttuzs4zyQeYHpGQLT OZ9zPPd+CEovYE57GT5VEcBY37/fxavtpz4mNfRM1ZfNWYErke/gG3NaC6E3USm8X8 MO4Gq9iqAfg6g== 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: Hi, Here's another gup_benchmark.c fix, which I ran into while adding support for the upcoming FOLL_PIN work. Anyway, the problem is clearly described in the patch commit description, and the fix seems like the best way to me, but the fix is not *completely* black and white. This fix forces MAP_ANONYMOUS for the MAP_HUGETLB case. However, another way to do it might be to mmap() against a valid hugetlb page file, instead of /dev/zero. But that seems like a lot of trouble and if I'm reading the intent correctly, MAP_ANONYMOUS is what's desired anyway. John Hubbard (1): mm/gup_benchmark: fix MAP_HUGETLB case tools/testing/selftests/vm/gup_benchmark.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --=20 2.23.0