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

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Message-ID: <20140723123028.GA11355@node.dhcp.inet.fi>
Date:	Wed, 23 Jul 2014 15:30:28 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
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 v8 00/22] Support ext4 on NV-DIMMs

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?

-- 
 Kirill A. Shutemov
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