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Diffstat (limited to 'tools/testing/selftests/mm/mremap_test.c')
-rw-r--r--tools/testing/selftests/mm/mremap_test.c361
1 files changed, 360 insertions, 1 deletions
diff --git a/tools/testing/selftests/mm/mremap_test.c b/tools/testing/selftests/mm/mremap_test.c
index bb84476a177f..fccf9e797a0c 100644
--- a/tools/testing/selftests/mm/mremap_test.c
+++ b/tools/testing/selftests/mm/mremap_test.c
@@ -380,6 +380,359 @@ out:
ksft_test_result_fail("%s\n", test_name);
}
+static bool is_multiple_vma_range_ok(unsigned int pattern_seed,
+ char *ptr, unsigned long page_size)
+{
+ int i;
+
+ srand(pattern_seed);
+ for (i = 0; i <= 10; i += 2) {
+ int j;
+ char *buf = &ptr[i * page_size];
+ size_t size = i == 4 ? 2 * page_size : page_size;
+
+ for (j = 0; j < size; j++) {
+ char chr = rand();
+
+ if (chr != buf[j]) {
+ ksft_print_msg("page %d offset %d corrupted, expected %d got %d\n",
+ i, j, chr, buf[j]);
+ return false;
+ }
+ }
+ }
+
+ return true;
+}
+
+static void mremap_move_multiple_vmas(unsigned int pattern_seed,
+ unsigned long page_size,
+ bool dont_unmap)
+{
+ int mremap_flags = MREMAP_FIXED | MREMAP_MAYMOVE;
+ char *test_name = "mremap move multiple vmas";
+ const size_t size = 11 * page_size;
+ bool success = true;
+ char *ptr, *tgt_ptr;
+ int i;
+
+ if (dont_unmap)
+ mremap_flags |= MREMAP_DONTUNMAP;
+
+ ptr = mmap(NULL, size, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANON, -1, 0);
+ if (ptr == MAP_FAILED) {
+ perror("mmap");
+ success = false;
+ goto out;
+ }
+
+ tgt_ptr = mmap(NULL, 2 * size, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANON, -1, 0);
+ if (tgt_ptr == MAP_FAILED) {
+ perror("mmap");
+ success = false;
+ goto out;
+ }
+ if (munmap(tgt_ptr, 2 * size)) {
+ perror("munmap");
+ success = false;
+ goto out_unmap;
+ }
+
+ /*
+ * Unmap so we end up with:
+ *
+ * 0 2 4 5 6 8 10 offset in buffer
+ * |*| |*| |*****| |*| |*|
+ * |*| |*| |*****| |*| |*|
+ * 0 1 2 3 4 5 6 pattern offset
+ */
+ for (i = 1; i < 10; i += 2) {
+ if (i == 5)
+ continue;
+
+ if (munmap(&ptr[i * page_size], page_size)) {
+ perror("munmap");
+ success = false;
+ goto out_unmap;
+ }
+ }
+
+ srand(pattern_seed);
+
+ /* Set up random patterns. */
+ for (i = 0; i <= 10; i += 2) {
+ int j;
+ size_t size = i == 4 ? 2 * page_size : page_size;
+ char *buf = &ptr[i * page_size];
+
+ for (j = 0; j < size; j++)
+ buf[j] = rand();
+ }
+
+ /* First, just move the whole thing. */
+ if (mremap(ptr, size, size, mremap_flags, tgt_ptr) == MAP_FAILED) {
+ perror("mremap");
+ success = false;
+ goto out_unmap;
+ }
+ /* Check move was ok. */
+ if (!is_multiple_vma_range_ok(pattern_seed, tgt_ptr, page_size)) {
+ success = false;
+ goto out_unmap;
+ }
+
+ /* Move next to itself. */
+ if (mremap(tgt_ptr, size, size, mremap_flags,
+ &tgt_ptr[size]) == MAP_FAILED) {
+ perror("mremap");
+ success = false;
+ goto out_unmap;
+ }
+ /* Check that the move is ok. */
+ if (!is_multiple_vma_range_ok(pattern_seed, &tgt_ptr[size], page_size)) {
+ success = false;
+ goto out_unmap;
+ }
+
+ /* Map a range to overwrite. */
+ if (mmap(tgt_ptr, size, PROT_NONE,
+ MAP_PRIVATE | MAP_ANON | MAP_FIXED, -1, 0) == MAP_FAILED) {
+ perror("mmap tgt");
+ success = false;
+ goto out_unmap;
+ }
+ /* Move and overwrite. */
+ if (mremap(&tgt_ptr[size], size, size,
+ mremap_flags, tgt_ptr) == MAP_FAILED) {
+ perror("mremap");
+ success = false;
+ goto out_unmap;
+ }
+ /* Check that the move is ok. */
+ if (!is_multiple_vma_range_ok(pattern_seed, tgt_ptr, page_size)) {
+ success = false;
+ goto out_unmap;
+ }
+
+out_unmap:
+ if (munmap(tgt_ptr, 2 * size))
+ perror("munmap tgt");
+ if (munmap(ptr, size))
+ perror("munmap src");
+
+out:
+ if (success)
+ ksft_test_result_pass("%s%s\n", test_name,
+ dont_unmap ? " [dontunnmap]" : "");
+ else
+ ksft_test_result_fail("%s%s\n", test_name,
+ dont_unmap ? " [dontunnmap]" : "");
+}
+
+static void mremap_shrink_multiple_vmas(unsigned long page_size,
+ bool inplace)
+{
+ char *test_name = "mremap shrink multiple vmas";
+ const size_t size = 10 * page_size;
+ bool success = true;
+ char *ptr, *tgt_ptr;
+ void *res;
+ int i;
+
+ ptr = mmap(NULL, size, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANON, -1, 0);
+ if (ptr == MAP_FAILED) {
+ perror("mmap");
+ success = false;
+ goto out;
+ }
+
+ tgt_ptr = mmap(NULL, size, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANON, -1, 0);
+ if (tgt_ptr == MAP_FAILED) {
+ perror("mmap");
+ success = false;
+ goto out;
+ }
+ if (munmap(tgt_ptr, size)) {
+ perror("munmap");
+ success = false;
+ goto out_unmap;
+ }
+
+ /*
+ * Unmap so we end up with:
+ *
+ * 0 2 4 6 8 10 offset in buffer
+ * |*| |*| |*| |*| |*| |*|
+ * |*| |*| |*| |*| |*| |*|
+ */
+ for (i = 1; i < 10; i += 2) {
+ if (munmap(&ptr[i * page_size], page_size)) {
+ perror("munmap");
+ success = false;
+ goto out_unmap;
+ }
+ }
+
+ /*
+ * Shrink in-place across multiple VMAs and gaps so we end up with:
+ *
+ * 0
+ * |*|
+ * |*|
+ */
+ if (inplace)
+ res = mremap(ptr, size, page_size, 0);
+ else
+ res = mremap(ptr, size, page_size, MREMAP_MAYMOVE | MREMAP_FIXED,
+ tgt_ptr);
+
+ if (res == MAP_FAILED) {
+ perror("mremap");
+ success = false;
+ goto out_unmap;
+ }
+
+out_unmap:
+ if (munmap(tgt_ptr, size))
+ perror("munmap tgt");
+ if (munmap(ptr, size))
+ perror("munmap src");
+out:
+ if (success)
+ ksft_test_result_pass("%s%s\n", test_name,
+ inplace ? " [inplace]" : "");
+ else
+ ksft_test_result_fail("%s%s\n", test_name,
+ inplace ? " [inplace]" : "");
+}
+
+static void mremap_move_multiple_vmas_split(unsigned int pattern_seed,
+ unsigned long page_size,
+ bool dont_unmap)
+{
+ char *test_name = "mremap move multiple vmas split";
+ int mremap_flags = MREMAP_FIXED | MREMAP_MAYMOVE;
+ const size_t size = 10 * page_size;
+ bool success = true;
+ char *ptr, *tgt_ptr;
+ int i;
+
+ if (dont_unmap)
+ mremap_flags |= MREMAP_DONTUNMAP;
+
+ ptr = mmap(NULL, size, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANON, -1, 0);
+ if (ptr == MAP_FAILED) {
+ perror("mmap");
+ success = false;
+ goto out;
+ }
+
+ tgt_ptr = mmap(NULL, size, PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANON, -1, 0);
+ if (tgt_ptr == MAP_FAILED) {
+ perror("mmap");
+ success = false;
+ goto out;
+ }
+ if (munmap(tgt_ptr, size)) {
+ perror("munmap");
+ success = false;
+ goto out_unmap;
+ }
+
+ /*
+ * Unmap so we end up with:
+ *
+ * 0 1 2 3 4 5 6 7 8 9 10 offset in buffer
+ * |**********| |*******|
+ * |**********| |*******|
+ * 0 1 2 3 4 5 6 7 8 9 pattern offset
+ */
+ if (munmap(&ptr[5 * page_size], page_size)) {
+ perror("munmap");
+ success = false;
+ goto out_unmap;
+ }
+
+ /* Set up random patterns. */
+ srand(pattern_seed);
+ for (i = 0; i < 10; i++) {
+ int j;
+ char *buf = &ptr[i * page_size];
+
+ if (i == 5)
+ continue;
+
+ for (j = 0; j < page_size; j++)
+ buf[j] = rand();
+ }
+
+ /*
+ * Move the below:
+ *
+ * <------------->
+ * 0 1 2 3 4 5 6 7 8 9 10 offset in buffer
+ * |**********| |*******|
+ * |**********| |*******|
+ * 0 1 2 3 4 5 6 7 8 9 pattern offset
+ *
+ * Into:
+ *
+ * 0 1 2 3 4 5 6 7 offset in buffer
+ * |*****| |*****|
+ * |*****| |*****|
+ * 2 3 4 5 6 7 pattern offset
+ */
+ if (mremap(&ptr[2 * page_size], size - 3 * page_size, size - 3 * page_size,
+ mremap_flags, tgt_ptr) == MAP_FAILED) {
+ perror("mremap");
+ success = false;
+ goto out_unmap;
+ }
+
+ /* Offset into random pattern. */
+ srand(pattern_seed);
+ for (i = 0; i < 2 * page_size; i++)
+ rand();
+
+ /* Check pattern. */
+ for (i = 0; i < 7; i++) {
+ int j;
+ char *buf = &tgt_ptr[i * page_size];
+
+ if (i == 3)
+ continue;
+
+ for (j = 0; j < page_size; j++) {
+ char chr = rand();
+
+ if (chr != buf[j]) {
+ ksft_print_msg("page %d offset %d corrupted, expected %d got %d\n",
+ i, j, chr, buf[j]);
+ goto out_unmap;
+ }
+ }
+ }
+
+out_unmap:
+ if (munmap(tgt_ptr, size))
+ perror("munmap tgt");
+ if (munmap(ptr, size))
+ perror("munmap src");
+out:
+ if (success)
+ ksft_test_result_pass("%s%s\n", test_name,
+ dont_unmap ? " [dontunnmap]" : "");
+ else
+ ksft_test_result_fail("%s%s\n", test_name,
+ dont_unmap ? " [dontunnmap]" : "");
+}
+
/* Returns the time taken for the remap on success else returns -1. */
static long long remap_region(struct config c, unsigned int threshold_mb,
char *rand_addr)
@@ -721,7 +1074,7 @@ int main(int argc, char **argv)
char *rand_addr;
size_t rand_size;
int num_expand_tests = 2;
- int num_misc_tests = 2;
+ int num_misc_tests = 8;
struct test test_cases[MAX_TEST] = {};
struct test perf_test_cases[MAX_PERF_TEST];
int page_size;
@@ -848,6 +1201,12 @@ int main(int argc, char **argv)
mremap_move_within_range(pattern_seed, rand_addr);
mremap_move_1mb_from_start(pattern_seed, rand_addr);
+ mremap_shrink_multiple_vmas(page_size, /* inplace= */true);
+ mremap_shrink_multiple_vmas(page_size, /* inplace= */false);
+ mremap_move_multiple_vmas(pattern_seed, page_size, /* dontunmap= */ false);
+ mremap_move_multiple_vmas(pattern_seed, page_size, /* dontunmap= */ true);
+ mremap_move_multiple_vmas_split(pattern_seed, page_size, /* dontunmap= */ false);
+ mremap_move_multiple_vmas_split(pattern_seed, page_size, /* dontunmap= */ true);
if (run_perf_tests) {
ksft_print_msg("\n%s\n",
generated by cgit (git 2.34.1) at 2025-08-02 13:24:49 +0000