PMEM Persistent Memory Driver Coming For Linux 4.1
Written by Michael Larabel in Linux Kernel on 13 April 2015 at 10:15 AM EDT. Add A Comment
LINUX KERNEL --
After months of work, the Intel-developed PMEM driver has been called for pulling into the Linux 4.1 kernel.

PMEM is short for Persistent Memory and is a new block device driver for persistent non-volatile memory space that's mapped to the system's physical memory space as large physical memory regions. There were competing PMEM driver patches in the past but the kernel developers have now settled for this Intel-developed implementation.

PMEM enables support for non-standard NVDIMMs and ADR protected memory. The new X86_PMEM_LEGACY Kconfig option explains, "Treat memory marked using the non-standard e820 type of 12 as used by the Intel Sandy Bridge-EP reference BIOS as protected memory. The kernel will offer these regions to the 'pmem' driver so they can be used for persistent storage."

PMEM is modified from the Block RAM Driver (BRD). The pull request of PMEM for Linux 4.1 was sent in by Ingo Molnar and can be found on the kernel mailing list.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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