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selftests: mm: add a test for mutually aligned moves > PMD size

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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@joelfernandes.org
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Joel Fernandes (Google) 2023-09-03 15:13:25 +00:00 committed by Andrew Morton
parent 99eb26d59c
commit 8ed873d8e5
1 changed files with 11 additions and 1 deletions
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12
tools/testing/selftests/mm/mremap_test.c
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@ -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");
/*