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CONFIG_DEV_DAX: DAX: direct access to differentiated memory

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The Linux kernel configuration item CONFIG_DEV_DAX:

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Support raw access to differentiated (persistence, bandwidth, latency...) memory via an mmap(2) capable character device. Platform firmware or a device driver may identify a platform memory resource that is differentiated from the baseline memory pool. Mappings of a /dev/daxX.Y device impose restrictions that make the mapping behavior deterministic.



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