From: Christoph Hellwig <hch@lst.de>
To: Dave Chinner <david@fromorbit.com>
Cc: Jan Kara <jack@suse.cz>,
linux-nvdimm@lists.01.org,
"Darrick J. Wong" <darrick.wong@oracle.com>,
Christoph Hellwig <hch@lst.de>,
linux-xfs <linux-xfs@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v4 18/18] xfs, dax: wire up dax_flush_dma support via a new xfs_sync_dma helper
Date: Thu, 4 Jan 2018 09:34:49 +0100 [thread overview]
Message-ID: <20180104083449.GO2548@lst.de> (raw)
In-Reply-To: <20180103075112.GF30682@dastard>
On Wed, Jan 03, 2018 at 06:51:12PM +1100, Dave Chinner wrote:
> > "Additionally we call it during the write operation, where aren't
> > concerned about exposing unallocated blocks but just want to provide
> > basic synchronization between a local writer and pNFS clients. mmap
> > writes would also benefit from this sort of synchronization, but due
> > to the tricky locking rules in the page fault path we don't bother."
> > ---
>
> The pnfs code went into 3.20 (4.0, IIRC), whilst the XFS_MMAPLOCK
> code went into 4.1. So the pnfs code was written and tested by
> Christoph a long time before I added the XFS_MMAPLOCK, despite them
> landing only one release apart. We've never really gone back to look
> at this because there hasn't been a need until now....
I suspect we should drop the MMAPLOCK as well, but I'd need to re-read
and re-test the code.
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WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Dave Chinner <david@fromorbit.com>
Cc: Dan Williams <dan.j.williams@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Jan Kara <jack@suse.cz>,
"Darrick J. Wong" <darrick.wong@oracle.com>,
linux-nvdimm@lists.01.org, linux-xfs <linux-xfs@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Ross Zwisler <ross.zwisler@linux.intel.com>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH v4 18/18] xfs, dax: wire up dax_flush_dma support via a new xfs_sync_dma helper
Date: Thu, 4 Jan 2018 09:34:49 +0100 [thread overview]
Message-ID: <20180104083449.GO2548@lst.de> (raw)
In-Reply-To: <20180103075112.GF30682@dastard>
On Wed, Jan 03, 2018 at 06:51:12PM +1100, Dave Chinner wrote:
> > "Additionally we call it during the write operation, where aren't
> > concerned about exposing unallocated blocks but just want to provide
> > basic synchronization between a local writer and pNFS clients. mmap
> > writes would also benefit from this sort of synchronization, but due
> > to the tricky locking rules in the page fault path we don't bother."
> > ---
>
> The pnfs code went into 3.20 (4.0, IIRC), whilst the XFS_MMAPLOCK
> code went into 4.1. So the pnfs code was written and tested by
> Christoph a long time before I added the XFS_MMAPLOCK, despite them
> landing only one release apart. We've never really gone back to look
> at this because there hasn't been a need until now....
I suspect we should drop the MMAPLOCK as well, but I'd need to re-read
and re-test the code.
next prev parent reply other threads:[~2018-01-04 8:29 UTC|newest]
Thread overview: 136+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-24 0:56 [PATCH v4 00/18] dax: fix dma vs truncate/hole-punch Dan Williams
2017-12-24 0:56 ` Dan Williams
2017-12-24 0:56 ` Dan Williams
2017-12-24 0:56 ` [PATCH v4 01/18] mm, dax: introduce pfn_t_special() Dan Williams
2017-12-24 0:56 ` Dan Williams
2018-01-04 8:16 ` Christoph Hellwig
2018-01-04 8:16 ` Christoph Hellwig
2017-12-24 0:56 ` [PATCH v4 02/18] ext4: auto disable dax instead of failing mount Dan Williams
2017-12-24 0:56 ` Dan Williams
2018-01-03 14:20 ` Jan Kara
2018-01-03 14:20 ` Jan Kara
2017-12-24 0:56 ` [PATCH v4 03/18] ext2: " Dan Williams
2017-12-24 0:56 ` Dan Williams
2018-01-03 14:21 ` Jan Kara
2018-01-03 14:21 ` Jan Kara
2017-12-24 0:56 ` [PATCH v4 04/18] dax: require 'struct page' by default for filesystem dax Dan Williams
2017-12-24 0:56 ` Dan Williams
2018-01-03 15:29 ` Jan Kara
2018-01-03 15:29 ` Jan Kara
2018-01-04 8:16 ` Christoph Hellwig
2018-01-04 8:16 ` Christoph Hellwig
2018-01-08 11:58 ` Gerald Schaefer
2018-01-08 11:58 ` Gerald Schaefer
2017-12-24 0:56 ` [PATCH v4 05/18] dax: stop using VM_MIXEDMAP for dax Dan Williams
2017-12-24 0:56 ` Dan Williams
2018-01-03 15:27 ` Jan Kara
2018-01-03 15:27 ` Jan Kara
2017-12-24 0:56 ` [PATCH v4 06/18] dax: stop using VM_HUGEPAGE " Dan Williams
2017-12-24 0:56 ` Dan Williams
2017-12-24 0:56 ` [PATCH v4 07/18] dax: store pfns in the radix Dan Williams
2017-12-24 0:56 ` Dan Williams
2017-12-27 0:17 ` Ross Zwisler
2017-12-27 0:17 ` Ross Zwisler
2018-01-02 20:15 ` Dan Williams
2018-01-02 20:15 ` Dan Williams
2018-01-03 15:39 ` Jan Kara
2018-01-03 15:39 ` Jan Kara
2017-12-24 0:56 ` [PATCH v4 08/18] tools/testing/nvdimm: add 'bio_delay' mechanism Dan Williams
2017-12-24 0:56 ` Dan Williams
2017-12-27 18:08 ` Ross Zwisler
2017-12-27 18:08 ` Ross Zwisler
2018-01-02 20:35 ` Dan Williams
2018-01-02 20:35 ` Dan Williams
2018-01-02 21:44 ` Dave Chinner
2018-01-02 21:44 ` Dave Chinner
2018-01-02 21:51 ` Dan Williams
2018-01-02 21:51 ` Dan Williams
2018-01-03 15:46 ` Jan Kara
2018-01-03 15:46 ` Jan Kara
2018-01-03 20:37 ` Jeff Moyer
2018-01-03 20:37 ` Jeff Moyer
2017-12-24 0:56 ` [PATCH v4 09/18] mm, dax: enable filesystems to trigger dev_pagemap ->page_free callbacks Dan Williams
2017-12-24 0:56 ` Dan Williams
2018-01-04 8:20 ` Christoph Hellwig
2018-01-04 8:20 ` Christoph Hellwig
2017-12-24 0:56 ` [PATCH v4 10/18] mm, dev_pagemap: introduce CONFIG_DEV_PAGEMAP_OPS Dan Williams
2017-12-24 0:56 ` Dan Williams
2018-01-04 8:25 ` Christoph Hellwig
2018-01-04 8:25 ` Christoph Hellwig
2017-12-24 0:56 ` [PATCH v4 11/18] fs, dax: introduce DEFINE_FSDAX_AOPS Dan Williams
2017-12-24 0:56 ` Dan Williams
2017-12-27 5:29 ` Matthew Wilcox
2017-12-27 5:29 ` Matthew Wilcox
2018-01-02 20:21 ` Dan Williams
2018-01-02 20:21 ` Dan Williams
2018-01-03 16:05 ` Jan Kara
2018-01-03 16:05 ` Jan Kara
2018-01-04 8:27 ` Christoph Hellwig
2018-01-04 8:27 ` Christoph Hellwig
2018-01-02 21:41 ` Dave Chinner
2018-01-02 21:41 ` Dave Chinner
2017-12-24 0:57 ` [PATCH v4 12/18] xfs: use DEFINE_FSDAX_AOPS Dan Williams
2017-12-24 0:57 ` Dan Williams
2018-01-02 21:15 ` Darrick J. Wong
2018-01-02 21:15 ` Darrick J. Wong
2018-01-02 21:40 ` Dan Williams
2018-01-02 21:40 ` Dan Williams
2018-01-03 16:09 ` Jan Kara
2018-01-03 16:09 ` Jan Kara
2018-01-04 8:28 ` Christoph Hellwig
2018-01-04 8:28 ` Christoph Hellwig
2017-12-24 0:57 ` [PATCH v4 13/18] ext4: " Dan Williams
2017-12-24 0:57 ` Dan Williams
2017-12-24 0:57 ` Dan Williams
2018-01-04 8:29 ` Christoph Hellwig
2018-01-04 8:29 ` Christoph Hellwig
2018-01-04 8:29 ` Christoph Hellwig
2017-12-24 0:57 ` [PATCH v4 14/18] ext2: " Dan Williams
2017-12-24 0:57 ` Dan Williams
2018-01-04 8:29 ` Christoph Hellwig
2018-01-04 8:29 ` Christoph Hellwig
2017-12-24 0:57 ` [PATCH v4 15/18] mm, fs, dax: use page->mapping to warn if dma collides with truncate Dan Williams
2017-12-24 0:57 ` Dan Williams
2018-01-04 8:30 ` Christoph Hellwig
2018-01-04 8:30 ` Christoph Hellwig
2018-01-04 9:39 ` Jan Kara
2018-01-04 9:39 ` Jan Kara
2017-12-24 0:57 ` [PATCH v4 16/18] wait_bit: introduce {wait_on,wake_up}_atomic_one Dan Williams
2017-12-24 0:57 ` Dan Williams
2018-01-04 8:30 ` Christoph Hellwig
2018-01-04 8:30 ` Christoph Hellwig
2017-12-24 0:57 ` [PATCH v4 17/18] mm, fs, dax: dax_flush_dma, handle dma vs block-map-change collisions Dan Williams
2017-12-24 0:57 ` Dan Williams
2018-01-04 8:31 ` Christoph Hellwig
2018-01-04 8:31 ` Christoph Hellwig
2018-01-04 11:12 ` Jan Kara
2018-01-04 11:12 ` Jan Kara
2018-01-07 21:58 ` Dan Williams
2018-01-07 21:58 ` Dan Williams
2018-01-08 13:50 ` Jan Kara
2018-01-08 13:50 ` Jan Kara
2018-03-08 17:02 ` Dan Williams
2018-03-08 17:02 ` Dan Williams
2018-03-09 12:56 ` Jan Kara
2018-03-09 12:56 ` Jan Kara
2018-03-09 16:15 ` Dan Williams
2018-03-09 16:15 ` Dan Williams
2018-03-09 17:26 ` Dan Williams
2018-03-09 17:26 ` Dan Williams
2017-12-24 0:57 ` [PATCH v4 18/18] xfs, dax: wire up dax_flush_dma support via a new xfs_sync_dma helper Dan Williams
2017-12-24 0:57 ` Dan Williams
2018-01-02 21:07 ` Darrick J. Wong
2018-01-02 21:07 ` Darrick J. Wong
2018-01-02 23:00 ` Dave Chinner
2018-01-02 23:00 ` Dave Chinner
2018-01-03 2:21 ` Dan Williams
2018-01-03 2:21 ` Dan Williams
2018-01-03 7:51 ` Dave Chinner
2018-01-03 7:51 ` Dave Chinner
2018-01-04 8:34 ` Christoph Hellwig [this message]
2018-01-04 8:34 ` Christoph Hellwig
2018-01-04 8:33 ` Christoph Hellwig
2018-01-04 8:33 ` Christoph Hellwig
2018-01-04 8:17 ` [PATCH v4 00/18] dax: fix dma vs truncate/hole-punch Christoph Hellwig
2018-01-04 8:17 ` Christoph Hellwig
2018-01-04 8:17 ` Christoph Hellwig
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