linux-kernel - Re: [PATCH v8 00/22] Support ext4 on NV-DIMMs

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Date:	Wed, 23 Jul 2014 09:59:46 -0400
From:	Matthew Wilcox <willy@...ux.intel.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 00/22] Support ext4 on NV-DIMMs

On Wed, Jul 23, 2014 at 03:30:28PM +0300, Kirill A. Shutemov wrote:
> On Tue, Jul 22, 2014 at 03:47:48PM -0400, Matthew Wilcox 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.
> 
> Matthew, as discussed before, your patchset make exessive use of
> i_mmap_mutex. Are you going to address this later? Or what's the plan?

Yes, it'll be addressed later.  I have some ideas, but I'd like to get
some experience with just how bad this single mutex is before trying to
split it.
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