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=-3.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 3CFB3C33CB7 for ; Fri, 31 Jan 2020 06:13:35 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 00563214D8 for ; Fri, 31 Jan 2020 06:13:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="1iqXLKau" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 00563214D8 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id A51DA6B0513; Fri, 31 Jan 2020 01:13:34 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id A01826B0515; Fri, 31 Jan 2020 01:13:34 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8F0116B0516; Fri, 31 Jan 2020 01:13:34 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0063.hostedemail.com [216.40.44.63]) by kanga.kvack.org (Postfix) with ESMTP id 7B4AA6B0513 for ; Fri, 31 Jan 2020 01:13:34 -0500 (EST) Received: from smtpin30.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 3BC61824999B for ; Fri, 31 Jan 2020 06:13:34 +0000 (UTC) X-FDA: 76436912748.30.sink11_1f1e8ff936658 X-HE-Tag: sink11_1f1e8ff936658 X-Filterd-Recvd-Size: 5124 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf50.hostedemail.com (Postfix) with ESMTP for ; Fri, 31 Jan 2020 06:13:33 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 6379C24683; Fri, 31 Jan 2020 06:13:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1580451213; bh=d9e2v5qlp3HGZU22ThTF0nZqci/MSnKQ8KaofJF1pU8=; h=Date:From:To:Subject:In-Reply-To:From; b=1iqXLKau8mNswYZPpn2jZNlG+EL9xn9pBWT+i0jnzteeeQ2GSZQVLrph19qX4olF2 3Qw5EhqtznUEbvqsAwezOTD1Ue1VQZ0YmGO8uaqSFllWfX5HeGLithesFokI9ejFWV Bts3Ana+gXLzhisd1s06i86VNPrm3+MT6iVoR1Gs= Date: Thu, 30 Jan 2020 22:13:32 -0800 From: Andrew Morton To: akpm@linux-foundation.org, alex.williamson@redhat.com, aneesh.kumar@linux.ibm.com, axboe@kernel.dk, bjorn.topel@intel.com, corbet@lwn.net, dan.j.williams@intel.com, daniel.vetter@ffwll.ch, hch@lst.de, hverkuil-cisco@xs4all.nl, ira.weiny@intel.com, jack@suse.cz, jgg@mellanox.com, jgg@ziepe.ca, jglisse@redhat.com, jhubbard@nvidia.com, kirill@shutemov.name, leonro@mellanox.com, linux-mm@kvack.org, mchehab@kernel.org, mm-commits@vger.kernel.org, rppt@linux.ibm.com, torvalds@linux-foundation.org Subject: [patch 044/118] mm/gup_benchmark: use proper FOLL_WRITE flags instead of hard-coding "1" Message-ID: <20200131061332.OQK3vA8vG%akpm@linux-foundation.org> In-Reply-To: <20200130221021.5f0211c56346d5485af07923@linux-foundation.org> User-Agent: s-nail v14.8.16 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable 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: =46rom: John Hubbard Subject: mm/gup_benchmark: use proper FOLL_WRITE flags instead of hard-codi= ng "1" Fix the gup benchmark flags to use the symbolic FOLL_WRITE, instead of a hard-coded "1" value. Also, clean up the filtering of gup flags a little, by just doing it once before issuing any of the get_user_pages*() calls. This makes it harder to overlook, instead of having little "gup_flags & 1" phrases in the function calls. Link: http://lkml.kernel.org/r/20200107224558.2362728-22-jhubbard@nvidia.com Signed-off-by: John Hubbard Reviewed-by: Ira Weiny Cc: Alex Williamson Cc: Aneesh Kumar K.V Cc: Bj=C3=B6rn T=C3=B6pel Cc: Christoph Hellwig Cc: Daniel Vetter Cc: Dan Williams Cc: Hans Verkuil Cc: Jan Kara Cc: Jason Gunthorpe Cc: Jason Gunthorpe Cc: Jens Axboe Cc: Jerome Glisse Cc: Jonathan Corbet Cc: Kirill A. Shutemov Cc: Leon Romanovsky Cc: Mauro Carvalho Chehab Cc: Mike Rapoport Signed-off-by: Andrew Morton --- mm/gup_benchmark.c | 9 ++++++--- tools/testing/selftests/vm/gup_benchmark.c | 6 +++++- 2 files changed, 11 insertions(+), 4 deletions(-) --- a/mm/gup_benchmark.c~mm-gup_benchmark-use-proper-foll_write-flags-inste= ad-of-hard-coding-1 +++ a/mm/gup_benchmark.c @@ -49,18 +49,21 @@ static int __gup_benchmark_ioctl(unsigne nr =3D (next - addr) / PAGE_SIZE; } =20 + /* Filter out most gup flags: only allow a tiny subset here: */ + gup->flags &=3D FOLL_WRITE; + switch (cmd) { case GUP_FAST_BENCHMARK: - nr =3D get_user_pages_fast(addr, nr, gup->flags & 1, + nr =3D get_user_pages_fast(addr, nr, gup->flags, pages + i); break; case GUP_LONGTERM_BENCHMARK: nr =3D get_user_pages(addr, nr, - (gup->flags & 1) | FOLL_LONGTERM, + gup->flags | FOLL_LONGTERM, pages + i, NULL); break; case GUP_BENCHMARK: - nr =3D get_user_pages(addr, nr, gup->flags & 1, pages + i, + nr =3D get_user_pages(addr, nr, gup->flags, pages + i, NULL); break; default: --- a/tools/testing/selftests/vm/gup_benchmark.c~mm-gup_benchmark-use-prope= r-foll_write-flags-instead-of-hard-coding-1 +++ a/tools/testing/selftests/vm/gup_benchmark.c @@ -18,6 +18,9 @@ #define GUP_LONGTERM_BENCHMARK _IOWR('g', 2, struct gup_benchmark) #define GUP_BENCHMARK _IOWR('g', 3, struct gup_benchmark) =20 +/* Just the flags we need, copied from mm.h: */ +#define FOLL_WRITE 0x01 /* check pte is writable */ + struct gup_benchmark { __u64 get_delta_usec; __u64 put_delta_usec; @@ -85,7 +88,8 @@ int main(int argc, char **argv) } =20 gup.nr_pages_per_call =3D nr_pages; - gup.flags =3D write; + if (write) + gup.flags |=3D FOLL_WRITE; =20 fd =3D open("/sys/kernel/debug/gup_benchmark", O_RDWR); if (fd =3D=3D -1) _