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Message-ID: <20230903151328.2981432-5-joel@joelfernandes.org>
Date: Sun, 3 Sep 2023 15:13:25 +0000
From: "Joel Fernandes (Google)" <joel@...lfernandes.org>
To: linux-kernel@...r.kernel.org
Cc: "Joel Fernandes (Google)" <joel@...lfernandes.org>,
Lorenzo Stoakes <lstoakes@...il.com>,
linux-kselftest@...r.kernel.org, linux-mm@...ck.org,
Shuah Khan <shuah@...nel.org>,
Vlastimil Babka <vbabka@...e.cz>,
Michal Hocko <mhocko@...e.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Kirill A Shutemov <kirill@...temov.name>,
"Liam R. Howlett" <liam.howlett@...cle.com>,
"Paul E. McKenney" <paulmck@...nel.org>,
Suren Baghdasaryan <surenb@...gle.com>,
Kalesh Singh <kaleshsingh@...gle.com>,
Lokesh Gidra <lokeshgidra@...gle.com>
Subject: [PATCH v6 4/7] selftests: mm: Add a test for mutually aligned moves > PMD size
This patch adds a test case to check if a PMD-alignment optimization
successfully happens.
I add support to make sure there is some room before the source mapping,
otherwise the optimization to trigger PMD-aligned move will be disabled
as the kernel will detect that a mapping before the source exists and
such optimization becomes impossible.
Reviewed-by: Lorenzo Stoakes <lstoakes@...il.com>
Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
---
tools/testing/selftests/mm/mremap_test.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/mm/mremap_test.c b/tools/testing/selftests/mm/mremap_test.c
index 6822d657f589..6304eb0947a3 100644
--- a/tools/testing/selftests/mm/mremap_test.c
+++ b/tools/testing/selftests/mm/mremap_test.c
@@ -44,6 +44,7 @@ enum {
_1MB = 1ULL << 20,
_2MB = 2ULL << 20,
_4MB = 4ULL << 20,
+ _5MB = 5ULL << 20,
_1GB = 1ULL << 30,
_2GB = 2ULL << 30,
PMD = _2MB,
@@ -235,6 +236,11 @@ static void *get_source_mapping(struct config c)
unsigned long long mmap_min_addr;
mmap_min_addr = get_mmap_min_addr();
+ /*
+ * For some tests, we need to not have any mappings below the
+ * source mapping. Add some headroom to mmap_min_addr for this.
+ */
+ mmap_min_addr += 10 * _4MB;
retry:
addr += c.src_alignment;
@@ -434,7 +440,7 @@ static int parse_args(int argc, char **argv, unsigned int *threshold_mb,
return 0;
}
-#define MAX_TEST 13
+#define MAX_TEST 14
#define MAX_PERF_TEST 3
int main(int argc, char **argv)
{
@@ -500,6 +506,10 @@ int main(int argc, char **argv)
test_cases[12] = MAKE_TEST(PUD, PUD, _2GB, NON_OVERLAPPING, EXPECT_SUCCESS,
"2GB mremap - Source PUD-aligned, Destination PUD-aligned");
+ /* Src and Dest addr 1MB aligned. 5MB mremap. */
+ test_cases[13] = MAKE_TEST(_1MB, _1MB, _5MB, NON_OVERLAPPING, EXPECT_SUCCESS,
+ "5MB mremap - Source 1MB-aligned, Destination 1MB-aligned");
+
perf_test_cases[0] = MAKE_TEST(page_size, page_size, _1GB, NON_OVERLAPPING, EXPECT_SUCCESS,
"1GB mremap - Source PTE-aligned, Destination PTE-aligned");
/*
--
2.42.0.283.g2d96d420d3-goog
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