The patch titled
Subject: selftests: mm: add a test for mutually aligned moves > PMD size
has been added to the -mm mm-unstable branch. Its filename is
selftests-mm-add-a-test-for-mutually-aligned-moves-pmd-size.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/selftests-mm-add-a-test-for-mutually-aligned-moves-pmd-size.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Joel Fernandes (Google)" <joel@xxxxxxxxxxxxxxxxx>
Subject: selftests: mm: add a test for mutually aligned moves > PMD size
Date: Sun, 3 Sep 2023 15:13:25 +0000
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.
Link: https://lkml.kernel.org/r/20230903151328.2981432-5-joel@xxxxxxxxxxxxxxxxx
Signed-off-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Reviewed-by: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Cc: Kalesh Singh <kaleshsingh@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>
Cc: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Lokesh Gidra <lokeshgidra@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Paul E. McKenney <paulmck@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/mm/mremap_test.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
--- a/tools/testing/selftests/mm/mremap_test.c~selftests-mm-add-a-test-for-mutually-aligned-moves-pmd-size
+++ a/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 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 **a
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");
/*
_
Patches currently in -mm which might be from joel@xxxxxxxxxxxxxxxxx are
mm-vmalloc-add-a-safer-version-of-find_vm_area-for-debug.patch
mm-mremap-optimize-the-start-addresses-in-move_page_tables.patch
mm-mremap-allow-moves-within-the-same-vma-for-stack-moves.patch
selftests-mm-fix-failure-case-when-new-remap-region-was-not-found.patch
selftests-mm-add-a-test-for-mutually-aligned-moves-pmd-size.patch
selftests-mm-add-a-test-for-remapping-to-area-immediately-after-existing-mapping.patch
selftests-mm-add-a-test-for-remapping-within-a-range.patch
selftests-mm-add-a-test-for-moving-from-an-offset-from-start-of-mapping.patch
