linux-kernel - [PATCH v2 2/2] mm:vmscan: the ref clean dirty folio skip unmap

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Date:   Thu, 19 Oct 2023 21:42:11 +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 v2 2/2] mm:vmscan: the ref clean dirty folio skip unmap

If the dirty folio in folio_list which is inactive file lru is
FOLIOREF_RECLAIM_CLEAN, the dirty folio can skip unmap in advance
to reduce recyling time.

Signed-off-by: Zhiguo Jiang <justinjiang@...o.com>
---

Changelog:
v1->v2:
1. The dirty folio in folio_list wich FOLIOREF_RECLAIM_CLEAN skip
   unmap in advance.

 mm/vmscan.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index e067269275a5..e587dafeef94 100755
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1225,7 +1225,10 @@ static unsigned int shrink_folio_list(struct list_head *folio_list,
 			stat->nr_ref_keep += nr_pages;
 			goto keep_locked;
 		case FOLIOREF_RECLAIM:
+			break;
 		case FOLIOREF_RECLAIM_CLEAN:
+			if (dirty)
+				goto activate_locked;
 			; /* try to reclaim the folio below */
 		}
 
-- 
2.39.0