On Mon, Jan 29, 2024 at 03:09:29PM +0800, Kefeng Wang wrote:
> 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.
Ah! I didn't understand the point of what you were doing in the
previous patch. Now it makes a lot more sense. This is a big
improvement, thanks!
