| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef MIGRATE_MODE_H_INCLUDED |
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| 3 | #define MIGRATE_MODE_H_INCLUDED |
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| 4 | /* |
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| 5 | * MIGRATE_ASYNC means never block |
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| 6 | * MIGRATE_SYNC_LIGHT in the current implementation means to allow blocking |
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| 7 | * on most operations but not ->writepage as the potential stall time |
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| 8 | * is too significant |
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| 9 | * MIGRATE_SYNC will block when migrating pages |
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| 10 | * MIGRATE_SYNC_NO_COPY will block when migrating pages but will not copy pages |
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| 11 | * with the CPU. Instead, page copy happens outside the migratepage() |
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| 12 | * callback and is likely using a DMA engine. See migrate_vma() and HMM |
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| 13 | * (mm/hmm.c) for users of this mode. |
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| 14 | */ |
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| 15 | enum migrate_mode { |
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| 16 | MIGRATE_ASYNC, |
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| 17 | MIGRATE_SYNC_LIGHT, |
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| 18 | MIGRATE_SYNC, |
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| 19 | MIGRATE_SYNC_NO_COPY, |
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| 20 | }; |
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| 21 | |
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| 22 | enum migrate_reason { |
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| 23 | MR_COMPACTION, |
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| 24 | MR_MEMORY_FAILURE, |
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| 25 | MR_MEMORY_HOTPLUG, |
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| 26 | MR_SYSCALL, /* also applies to cpusets */ |
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| 27 | MR_MEMPOLICY_MBIND, |
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| 28 | MR_NUMA_MISPLACED, |
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| 29 | MR_CONTIG_RANGE, |
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| 30 | MR_LONGTERM_PIN, |
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| 31 | MR_DEMOTION, |
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| 32 | MR_TYPES |
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| 33 | }; |
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| 34 | |
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| 35 | #endif /* MIGRATE_MODE_H_INCLUDED */ |
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| 36 | |
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