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| author | Alex Sierra <alex.sierra@amd.com> | 2022-07-15 10:05:10 -0500 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-07-17 17:14:27 -0700 |
| commit | f25cbb7a95a24ff9a2a3bebd308e303942ae6b2c (patch) | |
| tree | 71792ded12c877bb3607c65047887c254e0f0901 /mm/rmap.c | |
| parent | 5bb88dc571b1cbf0284100a317fb21ab7d03e40c (diff) | |
| download | linux-stable-f25cbb7a95a24ff9a2a3bebd308e303942ae6b2c.tar.gz | |
mm: add zone device coherent type memory support
Device memory that is cache coherent from device and CPU point of view.
This is used on platforms that have an advanced system bus (like CAPI or
CXL). Any page of a process can be migrated to such memory. However, no
one should be allowed to pin such memory so that it can always be evicted.
[hch@lst.de: rebased ontop of the refcount changes, remove is_dev_private_or_coherent_page]
Link: https://lkml.kernel.org/r/20220715150521.18165-4-alex.sierra@amd.com
Signed-off-by: Alex Sierra <alex.sierra@amd.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Alistair Popple <apopple@nvidia.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/rmap.c')
| -rw-r--r-- | mm/rmap.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index 83172ee0ea35..0532fd92ecb3 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1953,7 +1953,7 @@ static bool try_to_migrate_one(struct folio *folio, struct vm_area_struct *vma, /* Update high watermark before we lower rss */ update_hiwater_rss(mm); - if (folio_is_zone_device(folio)) { + if (folio_is_device_private(folio)) { unsigned long pfn = folio_pfn(folio); swp_entry_t entry; pte_t swp_pte; @@ -2124,7 +2124,8 @@ void try_to_migrate(struct folio *folio, enum ttu_flags flags) TTU_SYNC))) return; - if (folio_is_zone_device(folio) && !folio_is_device_private(folio)) + if (folio_is_zone_device(folio) && + (!folio_is_device_private(folio) && !folio_is_device_coherent(folio))) return; /* |