linux-kernel - Re: [PATCH v2 0/9] re-enable DAX PMD support

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Message-ID: <20160830230150.GA12173@linux.intel.com>
Date:   Tue, 30 Aug 2016 17:01:50 -0600
From:   Ross Zwisler <ross.zwisler@...ux.intel.com>
To:     Ross Zwisler <ross.zwisler@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.com>,
        linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-nvdimm@...ts.01.org,
        Matthew Wilcox <mawilcox@...rosoft.com>
Subject: Re: [PATCH v2 0/9] re-enable DAX PMD support

On Tue, Aug 23, 2016 at 04:04:10PM -0600, Ross Zwisler wrote:
> DAX PMDs have been disabled since Jan Kara introduced DAX radix tree based
> locking.  This series allows DAX PMDs to participate in the DAX radix tree
> based locking scheme so that they can be re-enabled.
> 
> Changes since v1:
>  - PMD entry locking is now done based on the starting offset of the PMD
>    entry, rather than on the radix tree slot which was unreliable. (Jan)
>  - Fixed the one issue I could find with hole punch.  As far as I can tell
>    hole punch now works correctly for both PMD and PTE DAX entries, 4k zero
>    pages and huge zero pages.
>  - Fixed the way that ext2 returns the size of holes in ext2_get_block().
>    (Jan)
>  - Made the 'wait_table' global variable static in respnse to a sparse
>    warning.
>  - Fixed some more inconsitent usage between the names 'ret' and 'entry'
>    for radix tree entry variables.
> 
> Ross Zwisler (9):
>   ext4: allow DAX writeback for hole punch
>   ext2: tell DAX the size of allocation holes
>   ext4: tell DAX the size of allocation holes
>   dax: remove buffer_size_valid()
>   dax: make 'wait_table' global variable static
>   dax: consistent variable naming for DAX entries
>   dax: coordinate locking for offsets in PMD range
>   dax: re-enable DAX PMD support
>   dax: remove "depends on BROKEN" from FS_DAX_PMD
> 
>  fs/Kconfig          |   1 -
>  fs/dax.c            | 297 +++++++++++++++++++++++++++++-----------------------
>  fs/ext2/inode.c     |   3 +
>  fs/ext4/inode.c     |   7 +-
>  include/linux/dax.h |  29 ++++-
>  mm/filemap.c        |   6 +-
>  6 files changed, 201 insertions(+), 142 deletions(-)
> 
> -- 
> 2.9.0

Ping on this series?  Any objections or comments?