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Re: [RFC PATCH v1 00/30] fs: inode->i_version rework and optimization

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On Wed, Dec 21, 2016 at 12:03:17PM -0500, Jeff Layton wrote:
> Only btrfs, ext4, and xfs implement it for data changes. Because of
> this, these filesystems must log the inode to disk whenever the
> i_version counter changes. That has a non-zero performance impact,
> especially on write-heavy workloads, because we end up dirtying the
> inode metadata on every write, not just when the times change. [1]

Do you have numbers to justify these changes?

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[RFC PATCH v1 00/30] fs: inode->i_version rework and optimization Jeff Layton <jlayton@redhat.com> - 2016-12-21 18:20 +0100
  [RFC PATCH v1 02/30] ecryptfs: remove unnecessary i_version bump Jeff Layton <jlayton@redhat.com> - 2016-12-21 18:20 +0100
  [RFC PATCH v1 06/30] jfs: remove initialization of i_version counter Jeff Layton <jlayton@redhat.com> - 2016-12-21 18:20 +0100
  [RFC PATCH v1 12/30] fat: convert to new i_version API Jeff Layton <jlayton@redhat.com> - 2016-12-21 18:20 +0100
  [RFC PATCH v1 07/30] nilfs2: remove inode->i_version initialization Jeff Layton <jlayton@redhat.com> - 2016-12-21 18:20 +0100
  [RFC PATCH v1 10/30] ntfs: remove i_version handling Jeff Layton <jlayton@redhat.com> - 2016-12-21 18:20 +0100
  [RFC PATCH v1 03/30] ceph: remove the bump of i_version Jeff Layton <jlayton@redhat.com> - 2016-12-21 18:20 +0100
  [RFC PATCH v1 15/30] btrfs: convert to new i_version API Jeff Layton <jlayton@redhat.com> - 2016-12-21 18:20 +0100
  Re: [RFC PATCH v1 00/30] fs: inode->i_version rework and optimization Christoph Hellwig <hch@infradead.org> - 2016-12-22 09:50 +0100
    Re: [RFC PATCH v1 00/30] fs: inode->i_version rework and  optimization Jeff Layton <jlayton@redhat.com> - 2016-12-22 15:50 +0100

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