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Date: Wed, 20 Sep 2023 14:04:00 +0100
From: David Howells <dhowells@...hat.com>
To: Jens Axboe <axboe@...nel.dk>
Cc: David Howells <dhowells@...hat.com>,
Al Viro <viro@...iv.linux.org.uk>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Christoph Hellwig <hch@....de>,
Christian Brauner <christian@...uner.io>,
David Laight <David.Laight@...LAB.COM>,
Matthew Wilcox <willy@...radead.org>,
Brendan Higgins <brendanhiggins@...gle.com>,
David Gow <davidgow@...gle.com>,
linux-fsdevel@...r.kernel.org,
linux-block@...r.kernel.org,
linux-mm@...ck.org,
netdev@...r.kernel.org,
linux-kselftest@...r.kernel.org,
kunit-dev@...glegroups.com,
linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
Christian Brauner <brauner@...nel.org>,
David Hildenbrand <david@...hat.com>,
John Hubbard <jhubbard@...dia.com>
Subject: [RFC PATCH v2 9/9] iov_iter: Add benchmarking kunit tests for UBUF/IOVEC
Add kunit tests to benchmark 256MiB copies to a UBUF iterator and an IOVEC
iterator. This attaches a userspace VM with a mapped file in it
temporarily to the test thread.
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Andrew Morton <akpm@...ux-foundation.org>
cc: Christoph Hellwig <hch@....de>
cc: Christian Brauner <brauner@...nel.org>
cc: Jens Axboe <axboe@...nel.dk>
cc: Al Viro <viro@...iv.linux.org.uk>
cc: Matthew Wilcox <willy@...radead.org>
cc: David Hildenbrand <david@...hat.com>
cc: John Hubbard <jhubbard@...dia.com>
cc: Brendan Higgins <brendanhiggins@...gle.com>
cc: David Gow <davidgow@...gle.com>
cc: linux-kselftest@...r.kernel.org
cc: kunit-dev@...glegroups.com
cc: linux-mm@...ck.org
cc: linux-fsdevel@...r.kernel.org
---
lib/kunit_iov_iter.c | 95 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 95 insertions(+)
diff --git a/lib/kunit_iov_iter.c b/lib/kunit_iov_iter.c
index 17f85f24b239..4ee939a1c5ec 100644
--- a/lib/kunit_iov_iter.c
+++ b/lib/kunit_iov_iter.c
@@ -1324,6 +1324,99 @@ static void *__init iov_kunit_create_source(struct kunit *test, size_t npages)
return scratch;
}
+/*
+ * Time copying 256MiB through an ITER_UBUF.
+ */
+static void __init iov_kunit_benchmark_ubuf(struct kunit *test)
+{
+ struct iov_iter iter;
+ unsigned int samples[IOV_KUNIT_NR_SAMPLES];
+ ktime_t a, b;
+ ssize_t copied;
+ size_t size = 256 * 1024 * 1024, npages = size / PAGE_SIZE;
+ void *scratch;
+ int i;
+ u8 __user *buffer;
+
+ /* Allocate a huge buffer and populate it with pages. */
+ buffer = iov_kunit_create_user_buf(test, npages, NULL);
+
+ /* Create a single large buffer to copy to/from. */
+ scratch = iov_kunit_create_source(test, npages);
+
+ /* Perform and time a bunch of copies. */
+ kunit_info(test, "Benchmarking copy_to_iter() over UBUF:\n");
+ for (i = 0; i < IOV_KUNIT_NR_SAMPLES; i++) {
+ size_t remain = size;
+
+ a = ktime_get_real();
+ do {
+ size_t part = min(remain, PAGE_SIZE);
+
+ iov_iter_ubuf(&iter, ITER_SOURCE, buffer, part);
+ copied = copy_from_iter(scratch, part, &iter);
+ KUNIT_EXPECT_EQ(test, copied, part);
+ remain -= part;
+ } while (remain > 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_IOVEC.
+ */
+static void __init iov_kunit_benchmark_iovec(struct kunit *test)
+{
+ struct iov_iter iter;
+ struct iovec *iov;
+ unsigned int samples[IOV_KUNIT_NR_SAMPLES];
+ ktime_t a, b;
+ ssize_t copied;
+ size_t size = 256 * 1024 * 1024, npages = size / PAGE_SIZE, part;
+ size_t ioc = size / PAGE_SIZE;
+ void *scratch;
+ int i;
+ u8 __user *buffer;
+
+ iov = kunit_kmalloc_array(test, ioc, sizeof(*iov), GFP_KERNEL);
+ KUNIT_ASSERT_NOT_NULL(test, iov);
+
+ /* Allocate a huge buffer and populate it with pages. */
+ buffer = iov_kunit_create_user_buf(test, npages, NULL);
+
+ /* Create a single large buffer to copy to/from. */
+ scratch = iov_kunit_create_source(test, npages);
+
+ /* Split the target over a number of iovecs */
+ copied = 0;
+ for (i = 0; i < ioc; i++) {
+ part = size / ioc;
+ iov[i].iov_base = buffer + copied;
+ iov[i].iov_len = part;
+ copied += part;
+ }
+ iov[i - 1].iov_len += size - part;
+
+ /* Perform and time a bunch of copies. */
+ kunit_info(test, "Benchmarking copy_to_iter() over IOVEC:\n");
+ for (i = 0; i < IOV_KUNIT_NR_SAMPLES; i++) {
+ iov_iter_init(&iter, ITER_SOURCE, iov, npages, size);
+
+ a = ktime_get_real();
+ copied = copy_from_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_KVEC.
*/
@@ -1524,6 +1617,8 @@ 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_ubuf),
+ KUNIT_CASE(iov_kunit_benchmark_iovec),
KUNIT_CASE(iov_kunit_benchmark_kvec),
KUNIT_CASE(iov_kunit_benchmark_bvec),
KUNIT_CASE(iov_kunit_benchmark_bvec_split),
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