Add PageZbud flag to page flags to distinguish pages allocated in zbud.
Currently these pages do not have any flags set.
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@xxxxxxxxxxx>
---
include/linux/page-flags.h | 12 ++++++++++++
mm/page_alloc.c | 3 +++
mm/zbud.c | 4 ++++
3 files changed, 19 insertions(+)
diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 6d53675..5b8b61a6 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -109,6 +109,12 @@ enum pageflags {
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
PG_compound_lock,
#endif
+#ifdef CONFIG_ZBUD
+ /* Allocated by zbud. Flag is necessary to find zbud pages to unuse
+ * during migration/compaction.
+ */
+ PG_zbud,
+#endif
__NR_PAGEFLAGS,
/* Filesystems */
@@ -275,6 +281,12 @@ PAGEFLAG_FALSE(HWPoison)
#define __PG_HWPOISON 0
#endif
+#ifdef CONFIG_ZBUD
+PAGEFLAG(Zbud, zbud)
+#else
+PAGEFLAG_FALSE(Zbud)
+#endif
+
u64 stable_page_flags(struct page *page);
static inline int PageUptodate(struct page *page)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index b100255..1a120fb 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6345,6 +6345,9 @@ static const struct trace_print_flags pageflag_names[] = {
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
{1UL << PG_compound_lock, "compound_lock" },
#endif
+#ifdef CONFIG_ZBUD
+ {1UL << PG_zbud, "zbud" },
+#endif
};
static void dump_page_flags(unsigned long flags)
diff --git a/mm/zbud.c b/mm/zbud.c
index a8e986f..a452949 100644
--- a/mm/zbud.c
+++ b/mm/zbud.c
@@ -230,7 +230,10 @@ static void get_zbud_page(struct zbud_header *zhdr)
static int put_zbud_page(struct zbud_pool *pool, struct zbud_header *zhdr)
{
struct page *page = virt_to_page(zhdr);
+ BUG_ON(!PageZbud(page));
+
if (put_page_testzero(page)) {
+ ClearPageZbud(page);
free_hot_cold_page(page, 0);
pool->pages_nr--;
return 1;
@@ -341,6 +344,7 @@ int zbud_alloc(struct zbud_pool *pool, int size, gfp_t gfp,
* don't increase the page count.
*/
zhdr = init_zbud_page(page);
+ SetPageZbud(page);
bud = FIRST;
found:
--
1.7.9.5
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