selftests/mm: support multi-size THP interface in thp_settings

Save and restore the new per-size hugepage enabled setting, if available
on the running kernel.

Since the number of per-size directories is not fixed, solve this as
simply as possible by catering for a maximum number in the thp_settings
struct (20).  Each array index is the order.  The value of THP_NEVER is
changed to 0 so that all of these new settings default to THP_NEVER and
the user only needs to fill in the ones they want to enable.

Link: https://lkml.kernel.org/r/20231207161211.2374093-8-ryan.roberts@arm.com
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
Tested-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Tested-by: John Hubbard <jhubbard@nvidia.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Barry Song <v-songbaohua@oppo.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Itaru Kitayama <itaru.kitayama@gmail.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Yin Fengwei <fengwei.yin@intel.com>
Cc: Yu Zhao <yuzhao@google.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 10 insertions, 1 deletions

diff --git a/tools/testing/selftests/mm/thp_settings.h b/tools/testing/selftests/mm/thp_settings.h
index ff3d98c30617..71cbff05f4c7 100644
--- a/tools/testing/selftests/mm/thp_settings.h
+++ b/tools/testing/selftests/mm/thp_settings.h
@@ -7,9 +7,10 @@
 #include <stdint.h>
 
 enum thp_enabled {
+	THP_NEVER,
 	THP_ALWAYS,
+	THP_INHERIT,
 	THP_MADVISE,
-	THP_NEVER,
 };
 
 enum thp_defrag {
@@ -29,6 +30,12 @@ enum shmem_enabled {
 	SHMEM_FORCE,
 };
 
+#define NR_ORDERS 20
+
+struct hugepages_settings {
+	enum thp_enabled enabled;
+};
+
 struct khugepaged_settings {
 	bool defrag;
 	unsigned int alloc_sleep_millisecs;
@@ -46,6 +53,7 @@ struct thp_settings {
 	bool use_zero_page;
 	struct khugepaged_settings khugepaged;
 	unsigned long read_ahead_kb;
+	struct hugepages_settings hugepages[NR_ORDERS];
 };
 
 int read_file(const char *path, char *buf, size_t buflen);
@@ -67,5 +75,6 @@ void thp_restore_settings(void);
 void thp_save_settings(void);
 
 void thp_set_read_ahead_path(char *path);
+unsigned long thp_supported_orders(void);
 
 #endif /* __THP_SETTINGS_H__ */