mm: do not reclaim private data from pinned page
authorJan Kara <jack@suse.cz>
Fri, 28 Apr 2023 12:41:40 +0000 (14:41 +0200)
committerAndrew Morton <akpm@linux-foundation.org>
Sat, 6 May 2023 17:10:07 +0000 (10:10 -0700)
commitd824ec2a154677f63c56cc71ffe4578274f6e32e
tree931286f4be4f1cfa5bc155e906a00427d5ec8cd7
parenta6a491c048882e7e424d407d32cba0b52d9ef2bf
mm: do not reclaim private data from pinned page

If the page is pinned, there's no point in trying to reclaim it.
Furthermore if the page is from the page cache we don't want to reclaim
fs-private data from the page because the pinning process may be writing
to the page at any time and reclaiming fs private info on a dirty page can
upset the filesystem (see link below).

Link: https://lore.kernel.org/linux-mm/20180103100430.GE4911@quack2.suse.cz
Link: https://lkml.kernel.org/r/20230428124140.30166-1-jack@suse.cz
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Peter Xu <peterx@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
mm/vmscan.c