From: Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
To: "Darrick J. Wong" <darrick.wong-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Cc: linux-nvdimm-y27Ovi1pjclAfugRpC6u6w@public.gmane.org,
linux-block-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
lsf-pc-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org
Subject: Re: [LSF/MM TOPIC] Future direction of DAX
Date: Mon, 16 Jan 2017 23:57:35 -0800 [thread overview]
Message-ID: <20170117075735.GB19654@infradead.org> (raw)
In-Reply-To: <20170117015033.GD10498-PTl6brltDGh4DFYR7WNSRA@public.gmane.org>
On Mon, Jan 16, 2017 at 05:50:33PM -0800, Darrick J. Wong wrote:
> I wouldn't consider it a barrier in general (since ext4 also prints
> EXPERIMENTAL warnings for DAX), merely one for XFS. I don't even think
> it's that big of a hurdle -- afaict XFS ought to be able to achieve this
> by modifying iomap_begin to allocate new pmem blocks, memcpy the
> contents, and update the memory mappings. I think.
Yes, and I have a working prototype for that. I'm just way to busy
with lots of bugfixing at the moment but I plan to get to it in this
merge window. I also agree that we can't mark a feature as fully
supported until it doesn't conflict with other features.
And I'm not going to get start on the PMEM_IMMUTABLE bullshit, please
don't even go there folks, it's a dead end.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: Jeff Moyer <jmoyer@redhat.com>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
lsf-pc@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org,
linux-nvdimm@ml01.01.org, linux-block@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [LSF/MM TOPIC] Future direction of DAX
Date: Mon, 16 Jan 2017 23:57:35 -0800 [thread overview]
Message-ID: <20170117075735.GB19654@infradead.org> (raw)
In-Reply-To: <20170117015033.GD10498@birch.djwong.org>
On Mon, Jan 16, 2017 at 05:50:33PM -0800, Darrick J. Wong wrote:
> I wouldn't consider it a barrier in general (since ext4 also prints
> EXPERIMENTAL warnings for DAX), merely one for XFS. I don't even think
> it's that big of a hurdle -- afaict XFS ought to be able to achieve this
> by modifying iomap_begin to allocate new pmem blocks, memcpy the
> contents, and update the memory mappings. I think.
Yes, and I have a working prototype for that. I'm just way to busy
with lots of bugfixing at the moment but I plan to get to it in this
merge window. I also agree that we can't mark a feature as fully
supported until it doesn't conflict with other features.
And I'm not going to get start on the PMEM_IMMUTABLE bullshit, please
don't even go there folks, it's a dead end.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: Jeff Moyer <jmoyer@redhat.com>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
lsf-pc@lists.linux-foundation.org, linux-fsdevel@vger.kernel.org,
linux-nvdimm@ml01.01.org, linux-block@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [LSF/MM TOPIC] Future direction of DAX
Date: Mon, 16 Jan 2017 23:57:35 -0800 [thread overview]
Message-ID: <20170117075735.GB19654@infradead.org> (raw)
In-Reply-To: <20170117015033.GD10498@birch.djwong.org>
On Mon, Jan 16, 2017 at 05:50:33PM -0800, Darrick J. Wong wrote:
> I wouldn't consider it a barrier in general (since ext4 also prints
> EXPERIMENTAL warnings for DAX), merely one for XFS. I don't even think
> it's that big of a hurdle -- afaict XFS ought to be able to achieve this
> by modifying iomap_begin to allocate new pmem blocks, memcpy the
> contents, and update the memory mappings. I think.
Yes, and I have a working prototype for that. I'm just way to busy
with lots of bugfixing at the moment but I plan to get to it in this
merge window. I also agree that we can't mark a feature as fully
supported until it doesn't conflict with other features.
And I'm not going to get start on the PMEM_IMMUTABLE bullshit, please
don't even go there folks, it's a dead end.
--
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next prev parent reply other threads:[~2017-01-17 7:57 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-14 0:20 [LSF/MM TOPIC] Future direction of DAX Ross Zwisler
2017-01-14 0:20 ` Ross Zwisler
2017-01-14 0:20 ` Ross Zwisler
[not found] ` <20170114002008.GA25379-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>
2017-01-14 8:26 ` Darrick J. Wong
2017-01-14 8:26 ` Darrick J. Wong
2017-01-14 8:26 ` Darrick J. Wong
2017-01-16 0:19 ` Viacheslav Dubeyko
2017-01-16 0:19 ` Viacheslav Dubeyko
2017-01-16 0:19 ` Viacheslav Dubeyko
2017-01-16 20:00 ` Jeff Moyer
2017-01-16 20:00 ` Jeff Moyer
2017-01-17 1:50 ` Darrick J. Wong
2017-01-17 1:50 ` Darrick J. Wong
2017-01-17 2:42 ` Dan Williams
2017-01-17 2:42 ` Dan Williams
[not found] ` <20170117015033.GD10498-PTl6brltDGh4DFYR7WNSRA@public.gmane.org>
2017-01-17 7:57 ` Christoph Hellwig [this message]
2017-01-17 7:57 ` Christoph Hellwig
2017-01-17 7:57 ` Christoph Hellwig
2017-01-17 14:54 ` Jeff Moyer
2017-01-17 14:54 ` Jeff Moyer
[not found] ` <x49mvep4tzw.fsf-RRHT56Q3PSP4kTEheFKJxxDDeQx5vsVwAInAS/Ez/D0@public.gmane.org>
2017-01-17 15:06 ` Christoph Hellwig
2017-01-17 15:06 ` Christoph Hellwig
2017-01-17 15:06 ` Christoph Hellwig
[not found] ` <20170117150638.GA3747-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2017-01-17 16:07 ` Jeff Moyer
2017-01-17 16:07 ` Jeff Moyer
2017-01-17 16:07 ` Jeff Moyer
2017-01-17 15:59 ` [Lsf-pc] " Jan Kara
2017-01-17 15:59 ` Jan Kara
2017-01-17 15:59 ` Jan Kara
2017-01-17 16:56 ` Dan Williams
2017-01-17 16:56 ` Dan Williams
2017-01-17 16:56 ` Dan Williams
2017-01-18 0:03 ` Kani, Toshimitsu
2017-01-18 0:03 ` Kani, Toshimitsu
2017-01-18 0:03 ` Kani, Toshimitsu
2017-01-18 5:25 ` willy
2017-01-18 5:25 ` willy
2017-01-18 5:25 ` willy
2017-01-18 6:01 ` Dan Williams
2017-01-18 6:01 ` Dan Williams
2017-01-18 6:01 ` Dan Williams
2017-01-18 6:07 ` willy
2017-01-18 6:07 ` willy
2017-01-18 6:07 ` willy
2017-01-18 6:25 ` Dan Williams
2017-01-18 6:25 ` Dan Williams
2017-01-18 6:25 ` Dan Williams
2017-01-18 17:22 ` Ross Zwisler
2017-01-18 17:22 ` Ross Zwisler
2017-01-18 17:22 ` Ross Zwisler
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