The quilt patch titled
Subject: mm: page_alloc: use the correct THP order for THP PCP
has been removed from the -mm tree. Its filename was
mm-page_alloc-use-the-correct-thp-order-for-thp-pcp.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Subject: mm: page_alloc: use the correct THP order for THP PCP
Date: Wed, 3 Apr 2024 21:47:21 +0800
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 pages 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 will fix this issue
Link: https://lkml.kernel.org/r/a25c9e14cd03907d5978b60546a69e6aa3fc2a7d.1712151833.git.baolin.wang@xxxxxxxxxxxxxxxxx
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>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Barry Song <baohua@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
--- a/mm/page_alloc.c~mm-page_alloc-use-the-correct-thp-order-for-thp-pcp
+++ a/mm/page_alloc.c
@@ -506,7 +506,7 @@ static inline unsigned int order_to_pind
{
#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(unsign
#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(uns
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;
_
Patches currently in -mm which might be from baolin.wang@xxxxxxxxxxxxxxxxx are
mm-page_alloc-allowing-mthp-compaction-to-capture-the-freed-page-directly.patch
