linux-kernel - [RFC 06/11] khugepaged: generalize alloc_charge

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Message-ID: <20250108233128.14484-7-npache@redhat.com>
Date: Wed,  8 Jan 2025 16:31:22 -0700
From: Nico Pache <npache@...hat.com>
To: linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
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Subject: [RFC 06/11] khugepaged: generalize alloc_charge_folio for mTHP support

alloc_charge_folio allocates the new folio for the khugepaged collapse.
Generalize the order of the folio allocations to support future mTHP
collapsing.

No functional changes in this patch.

Signed-off-by: Nico Pache <npache@...hat.com>
---
 mm/khugepaged.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index e2e6ca9265ab..6daf3a943a1a 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -1070,14 +1070,14 @@ static int __collapse_huge_page_swapin(struct mm_struct *mm,
 }
 
 static int alloc_charge_folio(struct folio **foliop, struct mm_struct *mm,
-			      struct collapse_control *cc)
+			      struct collapse_control *cc, int order)
 {
 	gfp_t gfp = (cc->is_khugepaged ? alloc_hugepage_khugepaged_gfpmask() :
 		     GFP_TRANSHUGE);
 	int node = khugepaged_find_target_node(cc);
 	struct folio *folio;
 
-	folio = __folio_alloc(gfp, HPAGE_PMD_ORDER, node, &cc->alloc_nmask);
+	folio = __folio_alloc(gfp, order, node, &cc->alloc_nmask);
 	if (!folio) {
 		*foliop = NULL;
 		count_vm_event(THP_COLLAPSE_ALLOC_FAILED);
@@ -1121,7 +1121,7 @@ static int collapse_huge_page(struct mm_struct *mm, unsigned long address,
 	 */
 	mmap_read_unlock(mm);
 
-	result = alloc_charge_folio(&folio, mm, cc);
+	result = alloc_charge_folio(&folio, mm, cc, HPAGE_PMD_ORDER);
 	if (result != SCAN_SUCCEED)
 		goto out_nolock;
 
@@ -1834,7 +1834,7 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr,
 	VM_BUG_ON(!IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) && !is_shmem);
 	VM_BUG_ON(start & (HPAGE_PMD_NR - 1));
 
-	result = alloc_charge_folio(&new_folio, mm, cc);
+	result = alloc_charge_folio(&new_folio, mm, cc, HPAGE_PMD_ORDER);
 	if (result != SCAN_SUCCEED)
 		goto out;
 
-- 
2.47.1