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Wed, 8 Jan 2020 09:46:05 +1100 (AEDT) Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate25.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Tue, 07 Jan 2020 14:45:45 -0800 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Tue, 07 Jan 2020 14:46:02 -0800 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Tue, 07 Jan 2020 14:46:02 -0800 Received: from HQMAIL107.nvidia.com (172.20.187.13) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 7 Jan 2020 22:46:02 +0000 Received: from hqnvemgw03.nvidia.com (10.124.88.68) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Tue, 7 Jan 2020 22:46:02 +0000 Received: from blueforge.nvidia.com (Not Verified[10.110.48.28]) by hqnvemgw03.nvidia.com with Trustwave SEG (v7, 5, 8, 10121) id ; Tue, 07 Jan 2020 14:46:01 -0800 From: John Hubbard To: Andrew Morton Subject: [PATCH v12 21/22] mm/gup_benchmark: use proper FOLL_WRITE flags instead of hard-coding "1" Date: Tue, 7 Jan 2020 14:45:57 -0800 Message-ID: <20200107224558.2362728-22-jhubbard@nvidia.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200107224558.2362728-1-jhubbard@nvidia.com> References: <20200107224558.2362728-1-jhubbard@nvidia.com> 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=1578437145; bh=QmPxrU1QAodbGxQOTjUXr6s2/wIdqi7diGO1jSgiLTQ=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:X-NVConfidentiality: Content-Transfer-Encoding:Content-Type; b=MVgWMvjdCoYVAfxCmBg0NkeDuPYr/zOYLE4OTWeZR9q3VqqevAsdy2UdGUuFZxfeA SMXnAV+U/1AQPUQHcK4HAu3zgWUEx+Dp3LLq0fmKMcRIgp4qB0DWjZ+VuMvfOjtJzB FGceX1ZoJtOhybYH/7Tc+eWjMlMFwLDP5ggAZ3tnXeUk+18gPYHqnQv7Xq5O5aDZTh EJMGjywChJyLI9V3528wjXiiRjSLVSp1+FVD+98X1l/ottZlL21BJDshqX6wxXGRN/ jy4gD3rsAW6FsslS5UKchsny0+bSxhxCtODDUO8KOA+5NC5F3EXV9TsGAco6HAcOU/ ATjD6ZgtnQnkg== X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Michal Hocko , Jan Kara , kvm@vger.kernel.org, linux-doc@vger.kernel.org, David Airlie , Dave Chinner , dri-devel@lists.freedesktop.org, LKML , linux-mm@kvack.org, Paul Mackerras , linux-kselftest@vger.kernel.org, Ira Weiny , Jonathan Corbet , linux-rdma@vger.kernel.org, Christoph Hellwig , Jason Gunthorpe , Vlastimil Babka , =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , linux-media@vger.kernel.org, Shuah Khan , John Hubbard , linux-block@vger.kernel.org, =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Al Viro , "Kirill A . Shutemov" , Dan Williams , Mauro Carvalho Chehab , Magnus Karlsson , Jens Axboe , netdev@vger.kernel.org, Alex Williamson , Daniel Vetter , linux-fsdevel@vger.kernel.org, bpf@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, "David S . Miller" , Mike Kravetz Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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. Reviewed-by: Ira Weiny Signed-off-by: John Hubbard --- mm/gup_benchmark.c | 9 ++++++--- tools/testing/selftests/vm/gup_benchmark.c | 6 +++++- 2 files changed, 11 insertions(+), 4 deletions(-) diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c index ad9d5b1c4473..8dba38e79a9f 100644 --- a/mm/gup_benchmark.c +++ b/mm/gup_benchmark.c @@ -49,18 +49,21 @@ static int __gup_benchmark_ioctl(unsigned int cmd, 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: diff --git a/tools/testing/selftests/vm/gup_benchmark.c b/tools/testing/sel= ftests/vm/gup_benchmark.c index 485cf06ef013..389327e9b30a 100644 --- a/tools/testing/selftests/vm/gup_benchmark.c +++ b/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) --=20 2.24.1