1 #ifndef MIGRATE_MODE_H_INCLUDED
2 #define MIGRATE_MODE_H_INCLUDED
4 * MIGRATE_ASYNC means never block
5 * MIGRATE_SYNC_LIGHT in the current implementation means to allow blocking
6 * on most operations but not ->writepage as the potential stall time
8 * MIGRATE_SYNC will block when migrating pages
9 * MIGRATE_SYNC_NO_COPY will block when migrating pages but will not copy pages
10 * with the CPU. Instead, page copy happens outside the migratepage()
11 * callback and is likely using a DMA engine. See migrate_vma() and HMM
12 * (mm/hmm.c) for users of this mode.
21 #endif /* MIGRATE_MODE_H_INCLUDED */