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From: Daniel Gomez <da.gomez@samsung.com>
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Subject: [PATCH 05/12] shmem: clear_highpage() if block is not uptodate
Thread-Topic: [PATCH 05/12] shmem: clear_highpage() if block is not uptodate
Thread-Index: AQHapozEyRWHtpwfgE2CvOQjrDJhgA==
Date: Wed, 15 May 2024 05:57:28 +0000
Message-ID: <20240515055719.32577-6-da.gomez@samsung.com>
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References: <20240515055719.32577-1-da.gomez@samsung.com>
	<CGME20240515055729eucas1p14e953424ad39bbb923c64163b1bbd4b3@eucas1p1.samsung.com>

clear_highpage() is called for all the subpages (blocks) in a large
folio when the folio is not uptodate. Do clear the subpages only when
they are not uptodate.

Signed-off-by: Daniel Gomez <da.gomez@samsung.com>
---
 mm/shmem.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index 69f3b98fdf7c..04992010225f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2256,7 +2256,8 @@ static int shmem_get_folio_gfp(struct inode *inode, p=
goff_t index,
 		long i, n =3D folio_nr_pages(folio);
=20
 		for (i =3D 0; i < n; i++)
-			clear_highpage(folio_page(folio, i));
+			if (!shmem_is_block_uptodate(folio, i))
+				clear_highpage(folio_page(folio, i));
 		flush_dcache_folio(folio);
 		shmem_set_range_uptodate(folio, 0, folio_size(folio));
 	}
--=20
2.43.0