Two more approaches to persistent-memory writes

The persistent-memory arrays we're told we'll all be able to get someday promise high-speed, byte-addressable storage in massive quantities. The Linux kernel community has been working to support this technology fully for a few years now, but there is one problem lacking a proper solution: allowing direct writes to persistent memory that is managed by a filesystem. None of the proposed solutions have yet made it into the mainline, but that hasn't stopped developers from trying; now two new patch sets addressing this issue are under consideration.

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