linux-kernel - [RFC PATCH 06/11] mm: khugepaged: allow khugepaged to check all shmem/file large orders

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Message-ID: <4cad4cded3f19c667442ae4d89ec03452c42a7b5.1755677674.git.baolin.wang@linux.alibaba.com>
Date: Wed, 20 Aug 2025 17:07:17 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: akpm@...ux-foundation.org,
	hughd@...gle.com,
	david@...hat.com,
	lorenzo.stoakes@...cle.com
Cc: ziy@...dia.com,
	Liam.Howlett@...cle.com,
	npache@...hat.com,
	ryan.roberts@....com,
	dev.jain@....com,
	baohua@...nel.org,
	baolin.wang@...ux.alibaba.com,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: [RFC PATCH 06/11] mm: khugepaged: allow khugepaged to check all shmem/file large orders

We are now ready to enable shmem/file mTHP collapse, allowing
thp_vma_allowable_orders() to check all permissible file large orders.

Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 mm/khugepaged.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index eb0b433d6ccb..d5ae2e6c4107 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -496,7 +496,7 @@ void khugepaged_enter_vma(struct vm_area_struct *vma,
 	if (!mm_flags_test(MMF_VM_HUGEPAGE, vma->vm_mm) &&
 	    hugepage_enabled()) {
 		unsigned long orders = vma_is_anonymous(vma) ?
-					THP_ORDERS_ALL_ANON : BIT(PMD_ORDER);
+				THP_ORDERS_ALL_ANON : THP_ORDERS_ALL_FILE_DEFAULT;
 
 		if (thp_vma_allowable_orders(vma, vm_flags, TVA_KHUGEPAGED,
 					    orders))
@@ -2780,7 +2780,7 @@ static unsigned int collapse_scan_mm_slot(unsigned int pages, int *result,
 	vma_iter_init(&vmi, mm, khugepaged_scan.address);
 	for_each_vma(vmi, vma) {
 		unsigned long orders = vma_is_anonymous(vma) ?
-					THP_ORDERS_ALL_ANON : BIT(PMD_ORDER);
+				THP_ORDERS_ALL_ANON : THP_ORDERS_ALL_FILE_DEFAULT;
 		unsigned long hstart, hend;
 
 		cond_resched();
-- 
2.43.5