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Date: Thu, 14 Sep 2023 06:04:10 +0000
From: Johannes Thumshirn <Johannes.Thumshirn@....com>
To: David Howells <dhowells@...hat.com>, Al Viro <viro@...iv.linux.org.uk>,
Linus Torvalds <torvalds@...ux-foundation.org>
CC: Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>, Christian
Brauner <christian@...uner.io>, David Laight <David.Laight@...LAB.COM>,
Matthew Wilcox <willy@...radead.org>, Jeff Layton <jlayton@...nel.org>,
"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
"linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
"linux-mm@...ck.org" <linux-mm@...ck.org>, "netdev@...r.kernel.org"
<netdev@...r.kernel.org>, "linux-kernel@...r.kernel.org"
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 01/13] iov_iter: Add a benchmarking kunit test
On 13.09.23 18:58, David Howells wrote:
> ---
> lib/kunit_iov_iter.c | 181 +++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 181 insertions(+)
Hi David,
#1 this is missing a SoB
#2 looks like all the KUNIT_ASSERT_NOT_NULL() macros are indented wrong
#3 a bit more of a commit message would be nice
Byte,
Johannes
>
> diff --git a/lib/kunit_iov_iter.c b/lib/kunit_iov_iter.c
> index 859b67c4d697..478fea956f58 100644
> --- a/lib/kunit_iov_iter.c
> +++ b/lib/kunit_iov_iter.c
> @@ -756,6 +756,184 @@ static void __init iov_kunit_extract_pages_xarray(struct kunit *test)
> KUNIT_SUCCEED();
> }
>
> +static void iov_kunit_free_page(void *data)
> +{
> + __free_page(data);
> +}
> +
> +static void __init iov_kunit_benchmark_print_stats(struct kunit *test,
> + unsigned int *samples)
> +{
> + unsigned long total = 0;
> + int i;
> +
> + for (i = 0; i < 16; i++) {
> + total += samples[i];
> + kunit_info(test, "run %x: %u uS\n", i, samples[i]);
> + }
> +
> + kunit_info(test, "avg %lu uS\n", total / 16);
> +}
> +
> +/*
> + * Time copying 256MiB through an ITER_BVEC.
> + */
> +static void __init iov_kunit_benchmark_bvec(struct kunit *test)
> +{
> + struct iov_iter iter;
> + struct bio_vec *bvec;
> + struct page *page, **pages;
> + unsigned int samples[16];
> + ktime_t a, b;
> + ssize_t copied;
> + size_t size = 256 * 1024 * 1024, npages = size / PAGE_SIZE;
> + void *scratch;
> + int i;
> +
> + /* Allocate a page and tile it repeatedly in the buffer. */
> + page = alloc_page(GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, page);
> + kunit_add_action_or_reset(test, iov_kunit_free_page, page);
> +
> + bvec = kunit_kmalloc_array(test, npages, sizeof(bvec[0]), GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, bvec);
> + for (i = 0; i < npages; i++)
> + bvec_set_page(&bvec[i], page, PAGE_SIZE, 0);
> +
> + /* Create a single large buffer to copy to/from. */
> + pages = kunit_kmalloc_array(test, npages, sizeof(pages[0]), GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, pages);
> + for (i = 0; i < npages; i++)
> + pages[i] = page;
> +
> + scratch = vmap(pages, npages, VM_MAP | VM_MAP_PUT_PAGES, PAGE_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, scratch);
> + kunit_add_action_or_reset(test, iov_kunit_unmap, scratch);
> +
> + /* Perform and time a bunch of copies. */
> + kunit_info(test, "Benchmarking copy_to_iter() over BVEC:\n");
> + for (i = 0; i < 16; i++) {
> + iov_iter_bvec(&iter, ITER_DEST, bvec, npages, size);
> + a = ktime_get_real();
> + copied = copy_to_iter(scratch, size, &iter);
> + b = ktime_get_real();
> + KUNIT_EXPECT_EQ(test, copied, size);
> + samples[i] = ktime_to_us(ktime_sub(b, a));
> + }
> +
> + iov_kunit_benchmark_print_stats(test, samples);
> + KUNIT_SUCCEED();
> +}
> +
> +/*
> + * Time copying 256MiB through an ITER_BVEC in 256 page chunks.
> + */
> +static void __init iov_kunit_benchmark_bvec_split(struct kunit *test)
> +{
> + struct iov_iter iter;
> + struct bio_vec *bvec;
> + struct page *page, **pages;
> + unsigned int samples[16];
> + ktime_t a, b;
> + ssize_t copied;
> + size_t size, npages = 64;
> + void *scratch;
> + int i, j;
> +
> + /* Allocate a page and tile it repeatedly in the buffer. */
> + page = alloc_page(GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, page);
> + kunit_add_action_or_reset(test, iov_kunit_free_page, page);
> +
> + /* Create a single large buffer to copy to/from. */
> + pages = kunit_kmalloc_array(test, npages, sizeof(pages[0]), GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, pages);
> + for (i = 0; i < npages; i++)
> + pages[i] = page;
> +
> + scratch = vmap(pages, npages, VM_MAP | VM_MAP_PUT_PAGES, PAGE_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, scratch);
> + kunit_add_action_or_reset(test, iov_kunit_unmap, scratch);
> +
> + /* Perform and time a bunch of copies. */
> + kunit_info(test, "Benchmarking copy_to_iter() over BVEC:\n");
> + for (i = 0; i < 16; i++) {
> + size = 256 * 1024 * 1024;
> + a = ktime_get_real();
> + do {
> + size_t part = min(size, npages * PAGE_SIZE);
> +
> + bvec = kunit_kmalloc_array(test, npages, sizeof(bvec[0]), GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, bvec);
> + for (j = 0; j < npages; j++)
> + bvec_set_page(&bvec[j], page, PAGE_SIZE, 0);
> +
> + iov_iter_bvec(&iter, ITER_DEST, bvec, npages, part);
> + copied = copy_to_iter(scratch, part, &iter);
> + KUNIT_EXPECT_EQ(test, copied, part);
> + size -= part;
> + } while (size > 0);
> + b = ktime_get_real();
> + samples[i] = ktime_to_us(ktime_sub(b, a));
> + }
> +
> + iov_kunit_benchmark_print_stats(test, samples);
> + KUNIT_SUCCEED();
> +}
> +
> +/*
> + * Time copying 256MiB through an ITER_XARRAY.
> + */
> +static void __init iov_kunit_benchmark_xarray(struct kunit *test)
> +{
> + struct iov_iter iter;
> + struct xarray *xarray;
> + struct page *page, **pages;
> + unsigned int samples[16];
> + ktime_t a, b;
> + ssize_t copied;
> + size_t size = 256 * 1024 * 1024, npages = size / PAGE_SIZE;
> + void *scratch;
> + int i;
> +
> + /* Allocate a page and tile it repeatedly in the buffer. */
> + page = alloc_page(GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, page);
> + kunit_add_action_or_reset(test, iov_kunit_free_page, page);
> +
> + xarray = iov_kunit_create_xarray(test);
> +
> + for (i = 0; i < npages; i++) {
> + void *x = xa_store(xarray, i, page, GFP_KERNEL);
> +
> + KUNIT_ASSERT_FALSE(test, xa_is_err(x));
> + }
> +
> + /* Create a single large buffer to copy to/from. */
> + pages = kunit_kmalloc_array(test, npages, sizeof(pages[0]), GFP_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, pages);
> + for (i = 0; i < npages; i++)
> + pages[i] = page;
> +
> + scratch = vmap(pages, npages, VM_MAP | VM_MAP_PUT_PAGES, PAGE_KERNEL);
> + KUNIT_ASSERT_NOT_NULL(test, scratch);
> + kunit_add_action_or_reset(test, iov_kunit_unmap, scratch);
> +
> + /* Perform and time a bunch of copies. */
> + kunit_info(test, "Benchmarking copy_to_iter() over XARRAY:\n");
> + for (i = 0; i < 16; i++) {
> + iov_iter_xarray(&iter, ITER_DEST, xarray, 0, size);
> + a = ktime_get_real();
> + copied = copy_to_iter(scratch, size, &iter);
> + b = ktime_get_real();
> + KUNIT_EXPECT_EQ(test, copied, size);
> + samples[i] = ktime_to_us(ktime_sub(b, a));
> + }
> +
> + iov_kunit_benchmark_print_stats(test, samples);
> + KUNIT_SUCCEED();
> +}
> +
> static struct kunit_case __refdata iov_kunit_cases[] = {
> KUNIT_CASE(iov_kunit_copy_to_kvec),
> KUNIT_CASE(iov_kunit_copy_from_kvec),
> @@ -766,6 +944,9 @@ static struct kunit_case __refdata iov_kunit_cases[] = {
> KUNIT_CASE(iov_kunit_extract_pages_kvec),
> KUNIT_CASE(iov_kunit_extract_pages_bvec),
> KUNIT_CASE(iov_kunit_extract_pages_xarray),
> + KUNIT_CASE(iov_kunit_benchmark_bvec),
> + KUNIT_CASE(iov_kunit_benchmark_bvec_split),
> + KUNIT_CASE(iov_kunit_benchmark_xarray),
> {}
> };
>
>
>
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