linux-kernel - [PATCH RFC] mm: madvise: use walk_page_range_vma() for madvise_free_single

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Message-Id: <20250603013154.5905-1-21cnbao@gmail.com>
Date: Tue,  3 Jun 2025 13:31:54 +1200
From: Barry Song <21cnbao@...il.com>
To: akpm@...ux-foundation.org,
	linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org,
	Barry Song <v-songbaohua@...o.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	David Hildenbrand <david@...hat.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Jann Horn <jannh@...gle.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Lokesh Gidra <lokeshgidra@...gle.com>,
	Tangquan Zheng <zhengtangquan@...o.com>
Subject: [PATCH RFC] mm: madvise: use walk_page_range_vma() for madvise_free_single_vma()

From: Barry Song <v-songbaohua@...o.com>

We've already found the VMA before calling madvise_free_single_vma(),
so calling walk_page_range() and doing find_vma() again seems
unnecessary. It also prevents potential optimizations for MADV_FREE
to use a per-VMA lock.

Cc: "Liam R. Howlett" <Liam.Howlett@...cle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: David Hildenbrand <david@...hat.com>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Jann Horn <jannh@...gle.com>
Cc: Suren Baghdasaryan <surenb@...gle.com>
Cc: Lokesh Gidra <lokeshgidra@...gle.com>
Cc: Tangquan Zheng <zhengtangquan@...o.com>
Signed-off-by: Barry Song <v-songbaohua@...o.com>
---
 mm/madvise.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/madvise.c b/mm/madvise.c
index d408ffa404b3..c6a28a2d3ff8 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -826,7 +826,7 @@ static int madvise_free_single_vma(struct madvise_behavior *madv_behavior,
 
 	mmu_notifier_invalidate_range_start(&range);
 	tlb_start_vma(tlb, vma);
-	walk_page_range(vma->vm_mm, range.start, range.end,
+	walk_page_range_vma(vma, range.start, range.end,
 			&madvise_free_walk_ops, tlb);
 	tlb_end_vma(tlb, vma);
 	mmu_notifier_invalidate_range_end(&range);
-- 
2.39.3 (Apple Git-146)