linux-kernel - [RFC PATCH 01/26] block: bdev: blockdev page cache is movable

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Message-Id: <20230418191313.268131-2-hannes@cmpxchg.org>
Date:   Tue, 18 Apr 2023 15:12:48 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     linux-mm@...ck.org
Cc:     Kaiyang Zhao <kaiyang2@...cmu.edu>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Vlastimil Babka <vbabka@...e.cz>,
        David Rientjes <rientjes@...gle.com>,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: [RFC PATCH 01/26] block: bdev: blockdev page cache is movable

While inspecting page blocks for the type of pages in them, I noticed
a large number of blockdev cache in unmovable blocks. However, these
pages are actually on the LRU, and their mapping has a .migrate_folio
callback; they can be reclaimed and compacted as necessary.

Put them into movable blocks, so they don't cause pollution, and
subsequent proliferation, of unmovable blocks.

Signed-off-by: Johannes Weiner <hannes@...xchg.org>
---
 block/bdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/bdev.c b/block/bdev.c
index edc110d90df4..6abe4766d073 100644
--- a/block/bdev.c
+++ b/block/bdev.c
@@ -488,7 +488,7 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno)
 	inode->i_mode = S_IFBLK;
 	inode->i_rdev = 0;
 	inode->i_data.a_ops = &def_blk_aops;
-	mapping_set_gfp_mask(&inode->i_data, GFP_USER);
+	mapping_set_gfp_mask(&inode->i_data, GFP_USER|__GFP_MOVABLE);
 
 	bdev = I_BDEV(inode);
 	mutex_init(&bdev->bd_fsfreeze_mutex);
-- 
2.39.2