linux-kernel - Re: [PATCH 7/8] pmem: Add support for page structs

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Date:	Mon, 23 Mar 2015 13:59:53 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	Boaz Harrosh <boaz@...xistor.com>
Cc:	Ingo Molnar <mingo@...hat.com>, X86 ML <x86@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Roger C. Pao" <rcpao.enmotus@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-nvdimm <linux-nvdimm@...ts.01.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Andy Lutomirski <luto@...capital.net>,
	Christoph Hellwig <hch@...radead.org>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: Re: [PATCH 7/8] pmem: Add support for page structs

On Thu, Mar 5, 2015 at 3:59 AM, Boaz Harrosh <boaz@...xistor.com> wrote:
>
> One of the current shortcomings of the NVDIMM/PMEM
> support is that this memory does not have a page-struct(s)
> associated with its memory and therefor cannot be passed
> to a block-device or network or DMAed in any way through
> another device in the system.
>
> The use of add_persistent_memory() fixes all this. After this patch
> an FS can do:
>         bdev_direct_access(,&pfn,);

Hmm, can we do this mapping on demand per direct access mapping rather
than unconditionally for each range that pmem is handling?

Going forward I don't think we want to be tied to guaranteeing that
plain bdev_direct_access() always yields pfn_to_page()-capable pfns.

Perhaps a DAX_MAP_PFN flag or something along those lines?
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