linux-kernel - [PATCH] mm/compaction: Use folio in hugetlb pathway

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Message-ID: <20250401021025.637333-2-vishal.moola@gmail.com>
Date: Mon, 31 Mar 2025 19:10:25 -0700
From: "Vishal Moola (Oracle)" <vishal.moola@...il.com>
To: linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org,
	muchun.song@...ux.dev,
	"Vishal Moola (Oracle)" <vishal.moola@...il.com>
Subject: [PATCH] mm/compaction: Use folio in hugetlb pathway

Use a folio in the hugetlb pathway during the compaction migrate-able
pageblock scan.

This removes a call to compound_head().

Signed-off-by: Vishal Moola (Oracle) <vishal.moola@...il.com>
---
 include/linux/hugetlb.h | 4 ++--
 mm/compaction.c         | 8 ++++----
 mm/hugetlb.c            | 3 +--
 3 files changed, 7 insertions(+), 8 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 8f3ac832ee7f..a57bed83c657 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -695,7 +695,7 @@ struct huge_bootmem_page {
 
 bool hugetlb_bootmem_page_zones_valid(int nid, struct huge_bootmem_page *m);
 
-int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list);
+int isolate_or_dissolve_huge_folio(struct folio *folio, struct list_head *list);
 int replace_free_hugepage_folios(unsigned long start_pfn, unsigned long end_pfn);
 void wait_for_freed_hugetlb_folios(void);
 struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma,
@@ -1083,7 +1083,7 @@ static inline struct folio *filemap_lock_hugetlb_folio(struct hstate *h,
 	return NULL;
 }
 
-static inline int isolate_or_dissolve_huge_page(struct page *page,
+static inline int isolate_or_dissolve_huge_folio(struct folio *folio,
 						struct list_head *list)
 {
 	return -ENOMEM;
diff --git a/mm/compaction.c b/mm/compaction.c
index ca71fd3c3181..dd868c861774 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -1001,10 +1001,11 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 				locked = NULL;
 			}
 
-			ret = isolate_or_dissolve_huge_page(page, &cc->migratepages);
+			folio = page_folio(page);
+			ret = isolate_or_dissolve_huge_folio(folio, &cc->migratepages);
 
 			/*
-			 * Fail isolation in case isolate_or_dissolve_huge_page()
+			 * Fail isolation in case isolate_or_dissolve_huge_folio()
 			 * reports an error. In case of -ENOMEM, abort right away.
 			 */
 			if (ret < 0) {
@@ -1016,12 +1017,11 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
 				goto isolate_fail;
 			}
 
-			if (PageHuge(page)) {
+			if (folio_test_hugetlb(folio)) {
 				/*
 				 * Hugepage was successfully isolated and placed
 				 * on the cc->migratepages list.
 				 */
-				folio = page_folio(page);
 				low_pfn += folio_nr_pages(folio) - 1;
 				goto isolate_success_no_list;
 			}
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 39f92aad7bd1..93bc8c4c904b 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2896,10 +2896,9 @@ static int alloc_and_dissolve_hugetlb_folio(struct hstate *h,
 	return ret;
 }
 
-int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list)
+int isolate_or_dissolve_huge_folio(struct folio *folio, struct list_head *list)
 {
 	struct hstate *h;
-	struct folio *folio = page_folio(page);
 	int ret = -EBUSY;
 
 	/*
-- 
2.48.1