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Message-ID: <20191113190359.GB12947@iweiny-DESK2.sc.intel.com>
Date: Wed, 13 Nov 2019 11:03:59 -0800
From: Ira Weiny <ira.weiny@...el.com>
To: John Hubbard <jhubbard@...dia.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Al Viro <viro@...iv.linux.org.uk>,
Alex Williamson <alex.williamson@...hat.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Björn Töpel <bjorn.topel@...el.com>,
Christoph Hellwig <hch@...radead.org>,
Dan Williams <dan.j.williams@...el.com>,
Daniel Vetter <daniel@...ll.ch>,
Dave Chinner <david@...morbit.com>,
David Airlie <airlied@...ux.ie>,
"David S . Miller" <davem@...emloft.net>, Jan Kara <jack@...e.cz>,
Jason Gunthorpe <jgg@...pe.ca>, Jens Axboe <axboe@...nel.dk>,
Jonathan Corbet <corbet@....net>,
Jérôme Glisse <jglisse@...hat.com>,
Magnus Karlsson <magnus.karlsson@...el.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Michael Ellerman <mpe@...erman.id.au>,
Michal Hocko <mhocko@...e.com>,
Mike Kravetz <mike.kravetz@...cle.com>,
Paul Mackerras <paulus@...ba.org>,
Shuah Khan <shuah@...nel.org>,
Vlastimil Babka <vbabka@...e.cz>, bpf@...r.kernel.org,
dri-devel@...ts.freedesktop.org, kvm@...r.kernel.org,
linux-block@...r.kernel.org, linux-doc@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-kselftest@...r.kernel.org,
linux-media@...r.kernel.org, linux-rdma@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 21/23] mm/gup_benchmark: support pin_user_pages() and
related calls
On Tue, Nov 12, 2019 at 08:27:08PM -0800, John Hubbard wrote:
> 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 <jhubbard@...dia.com>
Reviewed-by: Ira Weiny <ira.weiny@...el.com>
> ---
> 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)
>
> struct gup_benchmark {
> __u64 get_delta_usec;
> @@ -19,6 +22,44 @@ struct gup_benchmark {
> __u64 expansion[10]; /* For future use */
> };
>
> +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 = 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 = 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 = get_user_pages(addr, nr, gup->flags, pages + i,
> NULL);
> break;
> + case PIN_FAST_BENCHMARK:
> + nr = pin_user_pages_fast(addr, nr, gup->flags,
> + pages + i);
> + break;
> + case PIN_LONGTERM_BENCHMARK:
> + nr = pin_longterm_pages(addr, nr, gup->flags, pages + i,
> + NULL);
> + break;
> + case PIN_BENCHMARK:
> + nr = 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 = ktime_get();
>
> + /* Shifting the meaning of nr_pages: now it is actual number pinned: */
> + nr_pages = i;
> +
> gup->get_delta_usec = ktime_us_delta(end_time, start_time);
> gup->size = addr - gup->addr;
>
> + /*
> + * 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 = ktime_get();
> - for (i = 0; i < nr_pages; i++) {
> - if (!pages[i])
> - break;
> - put_page(pages[i]);
> - }
> +
> + put_back_pages(cmd, pages, nr_pages);
> +
> end_time = ktime_get();
> gup->put_delta_usec = ktime_us_delta(end_time, start_time);
>
> @@ -101,6 +161,9 @@ static long gup_benchmark_ioctl(struct file *filep, unsigned 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/selftests/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)
>
> +/*
> + * 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_pages(),
> + * 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 */
>
> @@ -40,8 +49,17 @@ int main(int argc, char **argv)
> char *file = "/dev/zero";
> char *p;
>
> - while ((opt = getopt(argc, argv, "m:r:n:f:tTLUwSH")) != -1) {
> + while ((opt = getopt(argc, argv, "m:r:n:f:abctTLUuwSH")) != -1) {
> switch (opt) {
> + case 'a':
> + cmd = PIN_FAST_BENCHMARK;
> + break;
> + case 'b':
> + cmd = PIN_LONGTERM_BENCHMARK;
> + break;
> + case 'c':
> + cmd = PIN_BENCHMARK;
> + break;
> case 'm':
> size = atoi(optarg) * MB;
> break;
> @@ -63,6 +81,9 @@ int main(int argc, char **argv)
> case 'U':
> cmd = GUP_BENCHMARK;
> break;
> + case 'u':
> + cmd = GUP_FAST_BENCHMARK;
> + break;
> case 'w':
> write = 1;
> break;
> --
> 2.24.0
>
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