On 2025/8/9 03:01, Zi Yan wrote:
The helper gathers an folio order statistics of folios within a virtual
address range and checks it against a given order list. It aims to provide
a more precise folio order check instead of just checking the existence of
PMD folios.
Signed-off-by: Zi Yan <[email protected]>
---
.../selftests/mm/split_huge_page_test.c | 4 +-
tools/testing/selftests/mm/vm_util.c | 133 ++++++++++++++++++
tools/testing/selftests/mm/vm_util.h | 7 +
3 files changed, 141 insertions(+), 3 deletions(-)
[snip]
+
+int check_folio_orders(char *vaddr_start, size_t len, int pagemap_file,
+ int kpageflags_file, int orders[], int nr_orders)
+{
+ int *vaddr_orders;
+ int status;
+ int i;
+
+ vaddr_orders = (int *)malloc(sizeof(int) * nr_orders);
+
+ if (!vaddr_orders)
+ ksft_exit_fail_msg("Cannot allocate memory for vaddr_orders");
+
+ memset(vaddr_orders, 0, sizeof(int) * nr_orders);
+ status = gather_folio_orders(vaddr_start, len, pagemap_file,
+ kpageflags_file, vaddr_orders, nr_orders);
+ if (status)
Missed calling free(vaddr_orders) before returning.
+ return status;
+
+ status = 0;
+ for (i = 0; i < nr_orders; i++)
+ if (vaddr_orders[i] != orders[i]) {
+ ksft_print_msg("order %d: expected: %d got %d\n", i,
+ orders[i], vaddr_orders[i]);
+ status = -1;
+ }
+
Ditto.
+ return status;
+}
+
/* If `ioctls' non-NULL, the allowed ioctls will be returned into the var */
int uffd_register_with_ioctls(int uffd, void *addr, uint64_t len,
bool miss, bool wp, bool minor, uint64_t *ioctls)
diff --git a/tools/testing/selftests/mm/vm_util.h
b/tools/testing/selftests/mm/vm_util.h
index 1843ad48d32b..02e3f1e7065b 100644
--- a/tools/testing/selftests/mm/vm_util.h
+++ b/tools/testing/selftests/mm/vm_util.h
@@ -18,6 +18,11 @@
#define PM_SWAP BIT_ULL(62)
#define PM_PRESENT BIT_ULL(63)
+#define KPF_COMPOUND_HEAD BIT_ULL(15)
+#define KPF_COMPOUND_TAIL BIT_ULL(16)
+#define KPF_THP BIT_ULL(22)
+
+
/*
* Ignore the checkpatch warning, we must read from x but don't want to do
* anything with it in order to trigger a read page fault. We therefore must
use
@@ -85,6 +90,8 @@ bool check_huge_shmem(void *addr, int nr_hpages, uint64_t
hpage_size);
int64_t allocate_transhuge(void *ptr, int pagemap_fd);
unsigned long default_huge_page_size(void);
int detect_hugetlb_page_sizes(size_t sizes[], int max);
+int check_folio_orders(char *vaddr_start, size_t len, int pagemap_file,
+ int kpageflags_file, int orders[], int nr_orders);
int uffd_register(int uffd, void *addr, uint64_t len,
bool miss, bool wp, bool minor);
