diff options
| author | Jérôme Glisse <jglisse@redhat.com> | 2017-03-23 17:42:47 -0400 |
|---|---|---|
| committer | Jérôme Glisse <jglisse@redhat.com> | 2017-08-09 18:13:29 -0400 |
| commit | 467169ed94e0803d95d53fa668ce6342e32c4fbf (patch) | |
| tree | 376366f58ebac01be9b5d32b5729e092e166dac3 /fs/hugetlbfs/inode.c | |
| parent | a0b426342dfe35f5a9887ca2cbcc11fe2220a6a2 (diff) | |
mm/migrate: new migrate mode MIGRATE_SYNC_NO_COPY
Introduce a new migration mode that allow to offload the copy to
a device DMA engine. This changes the workflow of migration and
not all address_space migratepage callback can support this. So
it needs to be tested in those cases.
This is intended to be use by migrate_vma() which itself is use
for thing like HMM (see include/linux/hmm.h).
Signed-off-by: Jérôme Glisse <jglisse@redhat.com>
Diffstat (limited to 'fs/hugetlbfs/inode.c')
| -rw-r--r-- | fs/hugetlbfs/inode.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 28d2753be094..04d0a70c214d 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -846,7 +846,10 @@ static int hugetlbfs_migrate_page(struct address_space *mapping, rc = migrate_huge_page_move_mapping(mapping, newpage, page); if (rc != MIGRATEPAGE_SUCCESS) return rc; - migrate_page_copy(newpage, page); + if (mode != MIGRATE_SYNC_NO_COPY) + migrate_page_copy(newpage, page); + else + migrate_page_states(newpage, page); return MIGRATEPAGE_SUCCESS; } |