Add memory operations for shmem (memfd) memory, and reuse
existing tests with the new memory operations.
Shmem tests can be called with "shmem" mem_type, and shmem tests
are ran with "all" mem_type as well.
Signed-off-by: Zach O'Keefe <zokeefe@xxxxxxxxxx>
---
tools/testing/selftests/vm/khugepaged.c | 57 ++++++++++++++++++++++++-
1 file changed, 55 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/vm/khugepaged.c b/tools/testing/selftests/vm/khugepaged.c
index 0ddfffb87411..9a136f65d43a 100644
--- a/tools/testing/selftests/vm/khugepaged.c
+++ b/tools/testing/selftests/vm/khugepaged.c
@@ -57,6 +57,7 @@ struct mem_ops {
static struct mem_ops *file_ops;
static struct mem_ops *anon_ops;
+static struct mem_ops *shmem_ops;
struct collapse_context {
void (*collapse)(const char *msg, char *p, int nr_hpages,
@@ -637,6 +638,40 @@ static bool file_check_huge(void *addr, int nr_hpages)
}
}
+static void *shmem_setup_area(int nr_hpages)
+{
+ void *p;
+ unsigned long size = nr_hpages * hpage_pmd_size;
+
+ finfo.fd = memfd_create("khugepaged-selftest-collapse-shmem", 0);
+ if (finfo.fd < 0) {
+ perror("memfd_create()");
+ exit(EXIT_FAILURE);
+ }
+ if (ftruncate(finfo.fd, size)) {
+ perror("ftruncate()");
+ exit(EXIT_FAILURE);
+ }
+ p = mmap(BASE_ADDR, size, PROT_READ | PROT_WRITE, MAP_SHARED, finfo.fd,
+ 0);
+ if (p != BASE_ADDR) {
+ perror("mmap()");
+ exit(EXIT_FAILURE);
+ }
+ return p;
+}
+
+static void shmem_cleanup_area(void *p, unsigned long size)
+{
+ munmap(p, size);
+ close(finfo.fd);
+}
+
+static bool shmem_check_huge(void *addr, int nr_hpages)
+{
+ return check_huge_shmem(addr, nr_hpages, hpage_pmd_size);
+}
+
static struct mem_ops __anon_ops = {
.setup_area = &anon_setup_area,
.cleanup_area = &anon_cleanup_area,
@@ -653,6 +688,14 @@ static struct mem_ops __file_ops = {
.name = "file",
};
+static struct mem_ops __shmem_ops = {
+ .setup_area = &shmem_setup_area,
+ .cleanup_area = &shmem_cleanup_area,
+ .fault = &anon_fault,
+ .check_huge = &shmem_check_huge,
+ .name = "shmem",
+};
+
static void __madvise_collapse(const char *msg, char *p, int nr_hpages,
struct mem_ops *ops, bool expect)
{
@@ -1214,7 +1257,7 @@ static void usage(void)
fprintf(stderr, "\nUsage: ./khugepaged <test type> [dir]\n\n");
fprintf(stderr, "\t<test type>\t: <context>:<mem_type>\n");
fprintf(stderr, "\t<context>\t: [all|khugepaged|madvise]\n");
- fprintf(stderr, "\t<mem_type>\t: [all|anon|file]\n");
+ fprintf(stderr, "\t<mem_type>\t: [all|anon|file|shmem]\n");
fprintf(stderr, "\n\t\"file,all\" mem_type requires [dir] argument\n");
fprintf(stderr, "\n\t\"file,all\" mem_type requires kernel built with\n");
fprintf(stderr, "\tCONFIG_READ_ONLY_THP_FOR_FS=y\n");
@@ -1256,10 +1299,13 @@ static void parse_test_type(int argc, const char **argv)
if (!strcmp(buf, "all")) {
file_ops = &__file_ops;
anon_ops = &__anon_ops;
+ shmem_ops = &__shmem_ops;
} else if (!strcmp(buf, "anon")) {
anon_ops = &__anon_ops;
} else if (!strcmp(buf, "file")) {
file_ops = &__file_ops;
+ } else if (!strcmp(buf, "shmem")) {
+ shmem_ops = &__shmem_ops;
} else {
usage();
}
@@ -1278,7 +1324,7 @@ int main(int argc, const char **argv)
struct settings default_settings = {
.thp_enabled = THP_MADVISE,
.thp_defrag = THP_DEFRAG_ALWAYS,
- .shmem_enabled = SHMEM_NEVER,
+ .shmem_enabled = SHMEM_ADVISE,
.use_zero_page = 0,
.khugepaged = {
.defrag = 1,
@@ -1322,16 +1368,20 @@ int main(int argc, const char **argv)
TEST(collapse_full, khugepaged_context, anon_ops);
TEST(collapse_full, khugepaged_context, file_ops);
+ TEST(collapse_full, khugepaged_context, shmem_ops);
TEST(collapse_full, madvise_context, anon_ops);
TEST(collapse_full, madvise_context, file_ops);
+ TEST(collapse_full, madvise_context, shmem_ops);
TEST(collapse_empty, khugepaged_context, anon_ops);
TEST(collapse_empty, madvise_context, anon_ops);
TEST(collapse_single_pte_entry, khugepaged_context, anon_ops);
TEST(collapse_single_pte_entry, khugepaged_context, file_ops);
+ TEST(collapse_single_pte_entry, khugepaged_context, shmem_ops);
TEST(collapse_single_pte_entry, madvise_context, anon_ops);
TEST(collapse_single_pte_entry, madvise_context, file_ops);
+ TEST(collapse_single_pte_entry, madvise_context, shmem_ops);
TEST(collapse_max_ptes_none, khugepaged_context, anon_ops);
TEST(collapse_max_ptes_none, khugepaged_context, file_ops);
@@ -1345,8 +1395,10 @@ int main(int argc, const char **argv)
TEST(collapse_full_of_compound, khugepaged_context, anon_ops);
TEST(collapse_full_of_compound, khugepaged_context, file_ops);
+ TEST(collapse_full_of_compound, khugepaged_context, shmem_ops);
TEST(collapse_full_of_compound, madvise_context, anon_ops);
TEST(collapse_full_of_compound, madvise_context, file_ops);
+ TEST(collapse_full_of_compound, madvise_context, shmem_ops);
TEST(collapse_compound_extreme, khugepaged_context, anon_ops);
TEST(collapse_compound_extreme, madvise_context, anon_ops);
@@ -1368,6 +1420,7 @@ int main(int argc, const char **argv)
TEST(madvise_collapse_existing_thps, madvise_context, anon_ops);
TEST(madvise_collapse_existing_thps, madvise_context, file_ops);
+ TEST(madvise_collapse_existing_thps, madvise_context, shmem_ops);
restore_settings(0);
}
--
2.37.1.559.g78731f0fdb-goog
