On Wed, 27 Aug 2014 16:22:20 -0500 (CDT) Christoph Lameter [off-list ref] wrote:

quoted

Some explanation of why one would use ext4 instead of, say,
suitably-modified ramfs/tmpfs/rd/etc?

The NVDIMM contents survive reboot and therefore ramfs and friends wont
work with it.

See "suitably modified".  Presumably this type of memory would need to
come from a particular page allocator zone.  ramfs would be unweildy
due to its use to dentry/inode caches, but rd/etc should be feasible.

I dunno, I'm not proposing implementations - I'm asking obvious
questions.  Stuff which should have been addressed in the changelogs
before one even starts to read the code...

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