Commit 8ed873d8 authored by Joel Fernandes (Google)'s avatar Joel Fernandes (Google) Committed by Andrew Morton
Browse files

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.

Link: https://lkml.kernel.org/r/20230903151328.2981432-5-joel@joelfernandes.org


Signed-off-by: default avatarJoel Fernandes (Google) <joel@joelfernandes.org>
Reviewed-by: default avatarLorenzo 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: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 99eb26d5

tools/testing/selftests/mm/mremap_test.c

+11 −1
Original line number Diff line number Diff line
@@ -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");

	/*