Edit File: migrate_mode.h
#ifndef MIGRATE_MODE_H_INCLUDED #define MIGRATE_MODE_H_INCLUDED /* * MIGRATE_ASYNC means never block * MIGRATE_SYNC_LIGHT in the current implementation means to allow blocking * 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, }; #define MIGRATE_SYNC_NO_COPY (MIGRATE_SYNC + 1) #endif /* MIGRATE_MODE_H_INCLUDED */