linux-kernel - Re: [PATCH v10 00/21] Support ext4 on NV-DIMMs

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Message-Id: <20140827143055.5210c5fb9696e460b456eb26@linux-foundation.org>
Date:	Wed, 27 Aug 2014 14:30:55 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, willy@...ux.intel.com
Subject: Re: [PATCH v10 00/21] Support ext4 on NV-DIMMs

On Wed, 27 Aug 2014 16:22:20 -0500 (CDT) Christoph Lameter <cl@...ux.com> wrote:

> > 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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