linux-kernel - Re: [Linux-nvdimm] another pmem variant V2

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Date:	Wed, 1 Apr 2015 09:50:10 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
	linux-nvdimm <linux-nvdimm@...1.01.org>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [Linux-nvdimm] another pmem variant V2


* Dan Williams <dan.j.williams@...el.com> wrote:

> On Tue, Mar 31, 2015 at 10:24 AM, Christoph Hellwig <hch@....de> wrote:
> > On Tue, Mar 31, 2015 at 06:44:56PM +0200, Ingo Molnar wrote:
> >> I'd be fine with that too - mind sending an updated series?
> >
> > I will send an updated one tonight or early tomorrow.
> >
> > Btw, do you want to keep the E820_PRAM name instead of E820_PMEM?
> > Seems like most people either don't care or prefer E820_PMEM. I'm
> > fine either way.
> 
> FWIW, I like the idea of having a separate E820_PRAM name for 
> type-12 memory vs future "can't yet disclose" UEFI memory type.  The 
> E820_PRAM type potentially has the property of being relegated to 
> "legacy" NVDIMMs.  We can later add E820_PMEM as a memory type that, 
> for example, is not automatically backed by struct page.  That said, 
> I'm fine either way.

I agree that it's a minor detail, but I think the separation is 
useful in two ways:

 - We have a generic 'pmem' driver, but the low level, platform 
   specific RAM enumeration name does not use that name.

 - 'E820_PRAM' is a more natural extension of 'E820_RAM'.

Later on we can then do a:

    s/E820_PRAM/E820_LEGACY_PRAM

rename or so.

Thanks,

	Ingo
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