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22 lines
758 B
22 lines
758 B
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef MIGRATE_MODE_H_INCLUDED |
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#define MIGRATE_MODE_H_INCLUDED |
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/* |
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* MIGRATE_ASYNC means never block |
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* MIGRATE_SYNC_LIGHT in the current implementation means to allow blocking |
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* on most operations but not ->writepage as the potential stall time |
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* is too significant |
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* MIGRATE_SYNC will block when migrating pages |
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* MIGRATE_SYNC_NO_COPY will block when migrating pages but will not copy pages |
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* with the CPU. Instead, page copy happens outside the migratepage() |
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* callback and is likely using a DMA engine. See migrate_vma() and HMM |
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* (mm/hmm.c) for users of this mode. |
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*/ |
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enum migrate_mode { |
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MIGRATE_ASYNC, |
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MIGRATE_SYNC_LIGHT, |
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MIGRATE_SYNC, |
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MIGRATE_SYNC_NO_COPY, |
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}; |
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#endif /* MIGRATE_MODE_H_INCLUDED */
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