1 #ifndef MIGRATE_MODE_H_INCLUDED 2 #define MIGRATE_MODE_H_INCLUDED 3 /* 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 7 * is too significant 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. 13 */ 14 enum migrate_mode { 15 MIGRATE_ASYNC, 16 MIGRATE_SYNC_LIGHT, 17 MIGRATE_SYNC, 18 MIGRATE_SYNC_NO_COPY, 19 }; 20 21 #endif /* MIGRATE_MODE_H_INCLUDED */ 22