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Miller" , Ira Weiny , Jan Kara , Jason Gunthorpe , Jens Axboe , Jonathan Corbet , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Magnus Karlsson , Mauro Carvalho Chehab , Michael Ellerman , Michal Hocko , Mike Kravetz , Paul Mackerras , Shuah Khan , Vlastimil Babka , , , , , , , , , , , , , LKML , John Hubbard Subject: [PATCH v4 21/23] mm/gup_benchmark: support pin_user_pages() and related calls Date: Tue, 12 Nov 2019 20:27:08 -0800 Message-ID: <20191113042710.3997854-22-jhubbard@nvidia.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191113042710.3997854-1-jhubbard@nvidia.com> References: <20191113042710.3997854-1-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=1573619237; bh=qDCGllxYSTERl727bBBMP3MdnPP+9frqWZ2/7CRJeGs=; 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=GngBZrY3L0I1MEQkNJkLis3/3dvW1B9ha9d0we70Rd7Grw3nJ1Q2QY5ZaDBWZgewK 0GukNlCdpY6HNaw8qg4TLwK39SxSwex7JNYD7x9mRJpvoAl4X/kXbrIdaT9dEARUWt ICi1c5fNpZZDNdMBAWasGwsX8tJ8iyDLv6kPhG4wbYYYsFOX1MZB16OlDwWmEs1KL3 4okvL/DgkXfwsTikpS24t0N84abwF4foLM+UAplyHqIoY24AcnW5EiVaTEK54VW5VR eIK501CIa6GOFqQu23XX27mPYlmhOJ6Z48bOyNVBpn/LQhLsQ8aXvYHtobA6iJZFbx QcVkpxhaefo5Q== Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Up until now, gup_benchmark supported testing of the following kernel functions: * get_user_pages(): via the '-U' command line option * get_user_pages_longterm(): via the '-L' command line option * get_user_pages_fast(): as the default (no options required) Add test coverage for the new corresponding pin_*() functions: * pin_user_pages(): via the '-c' command line option * pin_longterm_pages(): via the '-b' command line option * pin_user_pages_fast(): via the '-a' command line option Also, add an option for clarity: '-u' for what is now (still) the default choice: get_user_pages_fast(). Also, for the three commands that set FOLL_PIN, verify that the pages really are dma-pinned, via the new is_dma_pinned() routine. Those commands are: PIN_FAST_BENCHMARK : calls pin_user_pages_fast() PIN_LONGTERM_BENCHMARK : calls pin_longterm_pages() PIN_BENCHMARK : calls pin_user_pages() In between the calls to pin_*() and put_user_pages(), check each page: if page_dma_pinned() returns false, then WARN and return. Do this outside of the benchmark timestamps, so that it doesn't affect reported times. Signed-off-by: John Hubbard --- mm/gup_benchmark.c | 73 ++++++++++++++++++++-- tools/testing/selftests/vm/gup_benchmark.c | 23 ++++++- 2 files changed, 90 insertions(+), 6 deletions(-) diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c index 7fc44d25eca7..8f980d91dbf5 100644 --- a/mm/gup_benchmark.c +++ b/mm/gup_benchmark.c @@ -8,6 +8,9 @@ #define GUP_FAST_BENCHMARK _IOWR('g', 1, struct gup_benchmark) #define GUP_LONGTERM_BENCHMARK _IOWR('g', 2, struct gup_benchmark) #define GUP_BENCHMARK _IOWR('g', 3, struct gup_benchmark) +#define PIN_FAST_BENCHMARK _IOWR('g', 4, struct gup_benchmark) +#define PIN_LONGTERM_BENCHMARK _IOWR('g', 5, struct gup_benchmark) +#define PIN_BENCHMARK _IOWR('g', 6, struct gup_benchmark) =20 struct gup_benchmark { __u64 get_delta_usec; @@ -19,6 +22,44 @@ struct gup_benchmark { __u64 expansion[10]; /* For future use */ }; =20 +static void put_back_pages(int cmd, struct page **pages, unsigned long nr_= pages) +{ + int i; + + switch (cmd) { + case GUP_FAST_BENCHMARK: + case GUP_LONGTERM_BENCHMARK: + case GUP_BENCHMARK: + for (i =3D 0; i < nr_pages; i++) + put_page(pages[i]); + break; + + case PIN_FAST_BENCHMARK: + case PIN_LONGTERM_BENCHMARK: + case PIN_BENCHMARK: + put_user_pages(pages, nr_pages); + break; + } +} + +static void verify_dma_pinned(int cmd, struct page **pages, + unsigned long nr_pages) +{ + int i; + + switch (cmd) { + case PIN_FAST_BENCHMARK: + case PIN_LONGTERM_BENCHMARK: + case PIN_BENCHMARK: + for (i =3D 0; i < nr_pages; i++) { + if (WARN(!page_dma_pinned(pages[i]), + "pages[%d] is NOT dma-pinned\n", i)) + break; + } + break; + } +} + static int __gup_benchmark_ioctl(unsigned int cmd, struct gup_benchmark *gup) { @@ -65,6 +106,18 @@ static int __gup_benchmark_ioctl(unsigned int cmd, nr =3D get_user_pages(addr, nr, gup->flags, pages + i, NULL); break; + case PIN_FAST_BENCHMARK: + nr =3D pin_user_pages_fast(addr, nr, gup->flags, + pages + i); + break; + case PIN_LONGTERM_BENCHMARK: + nr =3D pin_longterm_pages(addr, nr, gup->flags, pages + i, + NULL); + break; + case PIN_BENCHMARK: + nr =3D pin_user_pages(addr, nr, gup->flags, pages + i, + NULL); + break; default: return -1; } @@ -75,15 +128,22 @@ static int __gup_benchmark_ioctl(unsigned int cmd, } end_time =3D ktime_get(); =20 + /* Shifting the meaning of nr_pages: now it is actual number pinned: */ + nr_pages =3D i; + gup->get_delta_usec =3D ktime_us_delta(end_time, start_time); gup->size =3D addr - gup->addr; =20 + /* + * Take an un-benchmark-timed moment to verify DMA pinned + * state: print a warning if any non-dma-pinned pages are found: + */ + verify_dma_pinned(cmd, pages, nr_pages); + start_time =3D ktime_get(); - for (i =3D 0; i < nr_pages; i++) { - if (!pages[i]) - break; - put_page(pages[i]); - } + + put_back_pages(cmd, pages, nr_pages); + end_time =3D ktime_get(); gup->put_delta_usec =3D ktime_us_delta(end_time, start_time); =20 @@ -101,6 +161,9 @@ static long gup_benchmark_ioctl(struct file *filep, uns= igned int cmd, case GUP_FAST_BENCHMARK: case GUP_LONGTERM_BENCHMARK: case GUP_BENCHMARK: + case PIN_FAST_BENCHMARK: + case PIN_LONGTERM_BENCHMARK: + case PIN_BENCHMARK: break; default: return -EINVAL; diff --git a/tools/testing/selftests/vm/gup_benchmark.c b/tools/testing/sel= ftests/vm/gup_benchmark.c index 389327e9b30a..03928e47a86f 100644 --- a/tools/testing/selftests/vm/gup_benchmark.c +++ b/tools/testing/selftests/vm/gup_benchmark.c @@ -18,6 +18,15 @@ #define GUP_LONGTERM_BENCHMARK _IOWR('g', 2, struct gup_benchmark) #define GUP_BENCHMARK _IOWR('g', 3, struct gup_benchmark) =20 +/* + * Similar to above, but use FOLL_PIN instead of FOLL_GET. This is done + * by calling pin_user_pages_fast(), pin_longterm_pages(), and pin_user_pa= ges(), + * respectively. + */ +#define PIN_FAST_BENCHMARK _IOWR('g', 4, struct gup_benchmark) +#define PIN_LONGTERM_BENCHMARK _IOWR('g', 5, struct gup_benchmark) +#define PIN_BENCHMARK _IOWR('g', 6, struct gup_benchmark) + /* Just the flags we need, copied from mm.h: */ #define FOLL_WRITE 0x01 /* check pte is writable */ =20 @@ -40,8 +49,17 @@ int main(int argc, char **argv) char *file =3D "/dev/zero"; char *p; =20 - while ((opt =3D getopt(argc, argv, "m:r:n:f:tTLUwSH")) !=3D -1) { + while ((opt =3D getopt(argc, argv, "m:r:n:f:abctTLUuwSH")) !=3D -1) { switch (opt) { + case 'a': + cmd =3D PIN_FAST_BENCHMARK; + break; + case 'b': + cmd =3D PIN_LONGTERM_BENCHMARK; + break; + case 'c': + cmd =3D PIN_BENCHMARK; + break; case 'm': size =3D atoi(optarg) * MB; break; @@ -63,6 +81,9 @@ int main(int argc, char **argv) case 'U': cmd =3D GUP_BENCHMARK; break; + case 'u': + cmd =3D GUP_FAST_BENCHMARK; + break; case 'w': write =3D 1; break; --=20 2.24.0