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[RFC,v2,25/43] mm: shmem: prevent swapping of PKRAM-enabled tmpfs pages

Message ID 1617140178-8773-26-git-send-email-anthony.yznaga@oracle.com (mailing list archive)
State New, archived
Headers show
Series PKRAM: Preserved-over-Kexec RAM | expand

Commit Message

Anthony Yznaga March 30, 2021, 9:36 p.m. UTC 
Work around the limitation that shmem pages must be in memory in order
to be preserved by preventing them from being swapped out in the first
place.  Do this by marking shmem pages associated with a PKRAM node
as unevictable.

Signed-off-by: Anthony Yznaga <anthony.yznaga@oracle.com>
---
 mm/shmem.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/mm/shmem.c b/mm/shmem.c
index c1c5760465f2..8dfe80aeee97 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2400,6 +2400,8 @@  static struct inode *shmem_get_inode(struct super_block *sb, const struct inode
 		INIT_LIST_HEAD(&info->swaplist);
 		simple_xattrs_init(&info->xattrs);
 		cache_no_acl(inode);
+		if (sbinfo->pkram)
+			mapping_set_unevictable(inode->i_mapping);
 
 		switch (mode & S_IFMT) {
 		default: