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mm/migrate_device: try to handle swapcache pages

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Migrating file pages and swapcache pages into device memory is not
supported.  Try to get rid of the swap cache, and if successful, go ahead
as with other anonymous pages.

Link: https://lkml.kernel.org/r/20230607172944.11713-1-mpenttil@redhat.com
Signed-off-by: Mika Penttilä <mpenttil@redhat.com>
Reviewed-by: "Huang, Ying" <ying.huang@intel.com>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Mika Penttilä 2023-06-07 20:29:44 +03:00 • committed by Andrew Morton
parent d9cfaf405b
commit df263d9a7d
1 changed files with 15 additions and 6 deletions
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21
mm/migrate_device.c
View file

@ -727,13 +727,22 @@ static void __migrate_device_pages(unsigned long *src_pfns,
if (is_device_private_page(newpage) ||
is_device_coherent_page(newpage)) {
/*
* For now only support anonymous memory migrating to
* device private or coherent memory.
*/
if (mapping) {
src_pfns[i] &= ~MIGRATE_PFN_MIGRATE;
continue;
struct folio *folio;
folio = page_folio(page);
/*
* For now only support anonymous memory migrating to
* device private or coherent memory.
*
* Try to get rid of swap cache if possible.
*/
if (!folio_test_anon(folio) ||
!folio_free_swap(folio)) {
src_pfns[i] &= ~MIGRATE_PFN_MIGRATE;
continue;
}
}
} else if (is_zone_device_page(newpage)) {
/*