On 18.08.25 20:46, Zi Yan wrote:
and rename it to is_backed_by_folio().
is_backed_by_folio() checks if the given vaddr is backed a folio with
a given order. It does so by:
1. getting the pfn of the vaddr;
2. checking kpageflags of the pfn;
if order is greater than 0:
3. checking kpageflags of the head pfn;
4. checking kpageflags of all tail pfns.
pmd_order is added to split_huge_page_test.c and replaces max_order.
Signed-off-by: Zi Yan <[email protected]>
Reviewed-by: Wei Yang <[email protected]>
Reviewed-by: wang lian <[email protected]>
---
.../selftests/mm/split_huge_page_test.c | 88 ++++++++++++++-----
tools/testing/selftests/mm/vm_util.c | 13 +++
tools/testing/selftests/mm/vm_util.h | 4 +
3 files changed, 81 insertions(+), 24 deletions(-)
diff --git a/tools/testing/selftests/mm/split_huge_page_test.c
b/tools/testing/selftests/mm/split_huge_page_test.c
index 089e146efeab..56d1eaf9a860 100644
--- a/tools/testing/selftests/mm/split_huge_page_test.c
+++ b/tools/testing/selftests/mm/split_huge_page_test.c
@@ -25,6 +25,7 @@
uint64_t pagesize;
unsigned int pageshift;
uint64_t pmd_pagesize;
+unsigned int pmd_order;
#define SPLIT_DEBUGFS "/sys/kernel/debug/split_huge_pages"
#define SMAP_PATH "/proc/self/smaps"
@@ -34,26 +35,66 @@ uint64_t pmd_pagesize;
#define PID_FMT_OFFSET "%d,0x%lx,0x%lx,%d,%d"
#define PATH_FMT "%s,0x%lx,0x%lx,%d"
-#define PFN_MASK ((1UL<<55)-1)
-#define KPF_THP (1UL<<22)
-
-static int is_backed_by_thp(char *vaddr, int pagemap_file, int kpageflags_file)
+static bool is_backed_by_folio(char *vaddr, int order, int pagemap_fd,
+ int kpageflags_fd)
{
- uint64_t paddr;
- uint64_t page_flags;
+ unsigned long pfn_head;
+ uint64_t pfn_flags;
+ unsigned long pfn;
+ unsigned long i;
Final nit (sorry!) :)
const unsigned long nr_pages = 1ul << order;
so you can make some of the code below easier to read.
Acked-by: David Hildenbrand <[email protected]>
--
Cheers
David / dhildenb
