23 lines
758 B
C
23 lines
758 B
C
/* 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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