Re: [GIT PULL] PMEM driver for v4.1

[Dan Williams]

On Wed, Apr 15, 2015 at 1:45 AM, Ingo Molnar <mingo@xxxxxxxxxx> wrote:
>
> * Dan Williams <dan.j.williams@xxxxxxxxx> wrote:
>
>> > None of this gives me warm fuzzy feelings...
>> >
>> > ... has anyone explored the possibility of putting 'struct page'
>> > into the pmem device itself, essentially using it as metadata?
>>
>> Yes, the impetus for proposing the pfn conversion of the block layer
>> was the consideration that persistent memory may have less write
>> endurance than DRAM.  The kernel preserving write endurance
>> exclusively for user data and the elimination of struct page
>> overhead motivated the patchset [1].
>>
>> [1]: https://lwn.net/Articles/636968/
>
> (Is there a Git URL where I could take a look at these patches?)

  git://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm
evacuate-struct-page-v1

Note that the bulk of the change is automated via Coccinelle.

For v2, I'm looking at enabling a kmap primitive to operate on a
pfn_t, kmap_pfn().
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