Messages in this thread |  | | Date | Mon, 13 Apr 2015 11:35:41 +0200 | From | Christoph Hellwig <> | Subject | Re: [GIT PULL] PMEM driver for v4.1 |
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On Mon, Apr 13, 2015 at 11:33:09AM +0200, Ingo Molnar wrote: > Limitations: this is a regular block device, and since the pmem areas > are not struct page backed, they are invisible to the rest of the > system (other than the block IO device), so direct IO to/from pmem > areas, direct mmap() or XIP is not possible yet. The page cache will > also shadow and double buffer pmem contents, etc.
Unless you use the DAX support in ext2/4 and soon XFS, in which case we avoid that double buffering when doing read/write and mmap
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