Commit 44042b449872 ("mm/page_alloc: allow high-order pages to be stored
on the per-cpu lists") extends the PCP allocator to store THP pages, and
it determines whether to cache THP pags in PCP by comparing with pageblock_order.
But the pageblock_order is not always equal to THP order, it might also
be MAX_PAGE_ORDER, which could prevent PCP from caching THP pages.
Therefore, using HPAGE_PMD_ORDER instead to determine the need for caching
THP for PCP can fix this issue
Fixes: 44042b449872 ("mm/page_alloc: allow high-order pages to be stored on the per-cpu lists")
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 1beb56f75319..915f4ef070da 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -506,7 +506,7 @@ static inline unsigned int order_to_pindex(int migratetype, int order)
{
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
if (order > PAGE_ALLOC_COSTLY_ORDER) {
- VM_BUG_ON(order != pageblock_order);
+ VM_BUG_ON(order != HPAGE_PMD_ORDER);
return NR_LOWORDER_PCP_LISTS;
}
#else
@@ -522,7 +522,7 @@ static inline int pindex_to_order(unsigned int pindex)
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
if (pindex == NR_LOWORDER_PCP_LISTS)
- order = pageblock_order;
+ order = HPAGE_PMD_ORDER;
#else
VM_BUG_ON(order > PAGE_ALLOC_COSTLY_ORDER);
#endif
@@ -535,7 +535,7 @@ static inline bool pcp_allowed_order(unsigned int order)
if (order <= PAGE_ALLOC_COSTLY_ORDER)
return true;
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
- if (order == pageblock_order)
+ if (order == HPAGE_PMD_ORDER)
return true;
#endif
return false;
--
2.39.3
