linux-kernel - [PATCH] mm/rmap: vm_flags including VM

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Date:   Tue, 24 Oct 2023 22:49:12 +0800
From:   Zhiguo Jiang <justinjiang@...o.com>
To:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     opensource.kernel@...o.com, Zhiguo Jiang <justinjiang@...o.com>
Subject: [PATCH] mm/rmap: vm_flags including VM_EXEC can exit timely

When pra->vm_flags include VM_EXEC flag and folio is file detected in
folio_referenced_one(), the folio referenced traversal process can be
exited timely to reduce the detecting folio referenced time.

Signed-off-by: Zhiguo Jiang <justinjiang@...o.com>
---
 mm/rmap.c | 2 ++
 1 file changed, 2 insertions(+)
 mode change 100644 => 100755 mm/rmap.c

diff --git a/mm/rmap.c b/mm/rmap.c
index 7a27a2b41802..932f3b7e8521
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -884,6 +884,8 @@ static bool folio_referenced_one(struct folio *folio,
 	if (referenced) {
 		pra->referenced++;
 		pra->vm_flags |= vma->vm_flags & ~VM_LOCKED;
+		if ((pra->vm_flags | VM_EXEC) && folio_is_file_lru(folio))
+			return false;
 	}
 
 	if (!pra->mapcount)
-- 
2.39.0