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From: Daniel Gomez <da.gomez@samsung.com>
To: "viro@zeniv.linux.org.uk" <viro@zeniv.linux.org.uk>,
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CC: "dagmcr@gmail.com" <dagmcr@gmail.com>, "linux-fsdevel@vger.kernel.org"
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	<hch@infradead.org>, "mcgrof@kernel.org" <mcgrof@kernel.org>, Pankaj Raghav
	<p.raghav@samsung.com>, "gost.dev@samsung.com" <gost.dev@samsung.com>,
	"Daniel Gomez" <da.gomez@samsung.com>
Subject: [RFC PATCH 5/9] shmem: clear_highpage() if block is not uptodate
Thread-Topic: [RFC PATCH 5/9] shmem: clear_highpage() if block is not
	uptodate
Thread-Index: AQHaW2RUm+AjPQwetUKmMMbff0NR9g==
Date: Fri, 9 Feb 2024 14:29:03 +0000
Message-ID: <20240209142901.126894-6-da.gomez@samsung.com>
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References: <20240209142901.126894-1-da.gomez@samsung.com>
	<CGME20240209142905eucas1p14498619591475e416a8163dbc96c90e4@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 614cda767298..b6f9a60b179b 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2253,7 +2253,8 @@ 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