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

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Message-Id: <20140827130613.c8f6790093d279a447196f17@linux-foundation.org>
Date:	Wed, 27 Aug 2014 13:06:13 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Matthew Wilcox <matthew.r.wilcox@...el.com>
Cc:	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 Tue, 26 Aug 2014 23:45:20 -0400 Matthew Wilcox <matthew.r.wilcox@...el.com> wrote:

> One of the primary uses for NV-DIMMs is to expose them as a block device
> and use a filesystem to store files on the NV-DIMM.  While that works,
> it currently wastes memory and CPU time buffering the files in the page
> cache.  We have support in ext2 for bypassing the page cache, but it
> has some races which are unfixable in the current design.  This series
> of patches rewrite the underlying support, and add support for direct
> access to ext4.

Sat down to read all this but I'm finding it rather unwieldy - it's
just a great blob of code.  Is there some overall
what-it-does-and-how-it-does-it roadmap?

Some explanation of why one would use ext4 instead of, say,
suitably-modified ramfs/tmpfs/rd/etc?

Performance testing results?

Carsten Otte wrote filemap_xip.c and may be a useful reviewer of this
work.

All the patch subjects violate Documentation/SubmittingPatches
section 15 ;)
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