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| author |   Kefeng Wang <wangkefeng.wang@huawei.com> | 2024-05-24 13:28:43 +0800 |
|---|---|---|
| committer |   Andrew Morton <akpm@linux-foundation.org> | 2024-07-03 19:30:00 -0700 |
| commit | 906632843d00a4a42072b19c423b30a9e7adef3c (patch) | |
| tree | 00ef081255ec3c2258056e48e4a25837d9089b49 /include/linux/migrate_mode.h | |
| parent | mm: migrate: remove migrate_folio_extra() (diff) | |
| download | wireguard-linux-906632843d00a4a42072b19c423b30a9e7adef3c.tar.xz wireguard-linux-906632843d00a4a42072b19c423b30a9e7adef3c.zip | |
mm: remove MIGRATE_SYNC_NO_COPY mode
Commit 2916ecc0f9d4 ("mm/migrate: new migrate mode MIGRATE_SYNC_NO_COPY")
introduce a new MIGRATE_SYNC_NO_COPY mode to allow to offload the copy to
a device DMA engine, which is only used __migrate_device_pages() to decide
whether or not copy the old page, and the MIGRATE_SYNC_NO_COPY mode only
set in hmm, as the MIGRATE_SYNC_NO_COPY set is removed by previous
cleanup, it seems that we could remove the unnecessary
MIGRATE_SYNC_NO_COPY.
Link: https://lkml.kernel.org/r/20240524052843.182275-6-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Jane Chu <jane.chu@oracle.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Benjamin LaHaise <bcrl@kvack.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Jiaqi Yan <jiaqiyan@google.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include/linux/migrate_mode.h')
| -rw-r--r-- | include/linux/migrate_mode.h | 5 |
1 files changed, 0 insertions, 5 deletions
diff --git a/include/linux/migrate_mode.h b/include/linux/migrate_mode.h index f37cc03f9369..9fb482bb7323 100644 --- a/include/linux/migrate_mode.h +++ b/include/linux/migrate_mode.h @@ -7,16 +7,11 @@ * on most operations but not ->writepage as the potential stall time * is too significant * MIGRATE_SYNC will block when migrating pages - * MIGRATE_SYNC_NO_COPY will block when migrating pages but will not copy pages - * with the CPU. Instead, page copy happens outside the migratepage() - * callback and is likely using a DMA engine. See migrate_vma() and HMM - * (mm/hmm.c) for users of this mode. */ enum migrate_mode { MIGRATE_ASYNC, MIGRATE_SYNC_LIGHT, MIGRATE_SYNC, - MIGRATE_SYNC_NO_COPY, }; enum migrate_reason { |