On 24.10.23 16:49, Zhiguo Jiang wrote:
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.
Can you further elaborate what the logic behind that is?
Why can we stop here if we're dealing with a pagecache folio in an
executable VMA?
Signed-off-by: Zhiguo Jiang <justinjiang@xxxxxxxx>
---
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)
--
Cheers,
David / dhildenb
