linux-kernel - Re: [Linux-nvdimm] [PATCH v2 01/20] e820, efi: add ACPI 6.0 persistent memory types

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Message-ID: <CALCETrXGqJJh8K58bNNy8GxST0g_655YRVqsaAXN8bqMjzdN7g@mail.gmail.com>
Date:	Mon, 18 May 2015 12:28:26 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Jens Axboe <axboe@...com>,
	linux-nvdimm <linux-nvdimm@...1.01.org>,
	Jeff Moyer <jmoyer@...hat.com>, Christoph Hellwig <hch@....de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [Linux-nvdimm] [PATCH v2 01/20] e820, efi: add ACPI 6.0
 persistent memory types

On May 16, 2015 12:48 AM, "Dan Williams" <dan.j.williams@...el.com> wrote:
>
> On Fri, May 15, 2015 at 8:43 AM, Jeff Moyer <jmoyer@...hat.com> wrote:
> > Dan Williams <dan.j.williams@...el.com> writes:
> >
> >> @@ -919,10 +920,31 @@ static inline const char *e820_type_to_string(int e820_type)
> >>       case E820_NVS:  return "ACPI Non-volatile Storage";
> >>       case E820_UNUSABLE:     return "Unusable memory";
> >>       case E820_PRAM: return "Persistent RAM";
> >> +     case E820_PMEM: return "Persistent I/O Memory";
> >
> > Minor nit, but nobody refers to this stuff as persistent I/O memory.
> > I've heard it referred to as persistent memory or storage class memory.
> > In the end, I doubt it matters.
>
> Had we not polluted the waters with E820_PRAM I would have chosen
> "Persistent Memory", but as we now need to support both I'd assume
> they need different names.

We could reverse it and call E820_PRAM "legacy persistent RAM" or
something similar.

</bikeshed>

>
> > Acked-by: Jeff Moyer <jmoyer@...hat.com>
>
> Thanks Jeff.
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