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CONFIG_BLK_DEV_RAM_DAX: Support Direct Access (DAX) to RAM block devices

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The Linux kernel configuration item CONFIG_BLK_DEV_RAM_DAX:

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Support filesystems using DAX to access RAM block devices. This avoids double-buffering data in the page cache before copying it to the block device. Answering Y will slightly enlarge the kernel, and will prevent RAM block device backing store memory from being allocated from highmem (only a problem for highmem systems).



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