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    Subject[RFC 24/43] mm: shmem: prevent swapping of PKRAM-enabled tmpfs pages
    Date
    Workaround 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(+)

    diff --git a/mm/shmem.c b/mm/shmem.c
    index 9c28ef657cd1..13475073fb52 100644
    --- a/mm/shmem.c
    +++ b/mm/shmem.c
    @@ -2360,6 +2360,8 @@ 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:
    --
    2.13.3
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