[RFC v4+ hot_track 00/19] vfs: hot data tracking

[zwu.kernel@gmail.com]

From: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>

NOTE:

  The patchset can be obtained via my kernel dev git on github:
git@github.com:wuzhy/kernel.git hot_tracking
  If you're interested, you can also can review them via
https://github.com/wuzhy/kernel/commits/hot_tracking

  For more info, please check hot_tracking.txt in Documentation

TODO List:

 1.) Need to do scalability or performance tests.
 2.) Need one simpler but effective temp calc'ing function
 3.) How to save the file temperature among the umount to be able to
     preserve the file tempreture after reboot

Ben Chociej, Matt Lupfer and Conor Scott originally wrote this code to
 be very btrfs-specific.  I've taken their code and attempted to
make it more generic and integrate it at the VFS level.

Changelog from v3:
 1.) Rewritten debugfs support based seq_file operation. [Dave Chinner]
 2.) Refactored workqueue support. [Dave Chinner]
 3.) Turn some Micro into be tunable   [Zhiyong, Zheng Liu]
       TIME_TO_KICK, and HEAT_UPDATE_DELAY
 4.) Introduce hot func registering framework [Zhiyong]
 5.) Remove global variable for hot tracking [Zhiyong]
 6.) Add xfs hot tracking support [Dave Chinner]
 7.) Add ext4 hot tracking support [Zheng Liu]
 8.) Cleanedup a lot of other issues [Dave Chinner]

v3:
 1.) Converted to Radix trees, not RB-tree [Zhiyong, Dave Chinner]
 2.) Added memory shrinker [Dave Chinner]

v2:
 1.) Converted to one workqueue to update map info periodically [Dave Chinner]
 2.) Cleanedup a lot of other issues [Dave Chinner]

v1:
 1.) Reduce new files and put all in fs/hot_tracking.[ch] [Dave Chinner]
 2.) Add btrfs hot tracking support [Zhiyong]
 3.) The first three patches can probably just be flattened into one.
                                        [Marco Stornelli , Dave Chinner]

Dave Chinner (1):
  xfs: add hot tracking support

Zheng Liu (1):
  ext4: add hot tracking support

Zhi Yong Wu (17):
  vfs: introduce private radix tree structures
  vfs: initialize and free data structures
  vfs: add I/O frequency update function
  vfs: add two map arrays
  vfs: add hooks to enable hot tracking
  vfs: add temp calculation function
  vfs: add map info update function
  vfs: add aging function
  vfs: add one work queue
  vfs: introduce hot func register framework
  vfs: register one shrinker
  vfs: add one ioctl interface
  debugfs: introduce one function
  vfs: add debugfs support
  sysfs: add two hot_track proc files
  btrfs: add hot tracking support
  vfs: add documentation

 Documentation/filesystems/00-INDEX         |    2 +
 Documentation/filesystems/hot_tracking.txt |  262 ++++++
 fs/Makefile                                |    2 +-
 fs/btrfs/ctree.h                           |    1 +
 fs/btrfs/super.c                           |   22 +-
 fs/compat_ioctl.c                          |    5 +
 fs/dcache.c                                |    2 +
 fs/debugfs/inode.c                         |   26 +
 fs/direct-io.c                             |    6 +
 fs/ext4/ext4.h                             |    3 +
 fs/ext4/super.c                            |   13 +-
 fs/hot_tracking.c                          | 1367 ++++++++++++++++++++++++++++
 fs/hot_tracking.h                          |   58 ++
 fs/ioctl.c                                 |   78 ++
 fs/xfs/xfs_mount.h                         |    1 +
 fs/xfs/xfs_super.c                         |   16 +
 include/linux/debugfs.h                    |    9 +
 include/linux/fs.h                         |    4 +
 include/linux/hot_tracking.h               |  149 +++
 kernel/sysctl.c                            |   14 +
 mm/filemap.c                               |    6 +
 mm/page-writeback.c                        |   12 +
 mm/readahead.c                             |    6 +
 23 files changed, 2061 insertions(+), 3 deletions(-)
 create mode 100644 Documentation/filesystems/hot_tracking.txt
 create mode 100644 fs/hot_tracking.c
 create mode 100644 fs/hot_tracking.h
 create mode 100644 include/linux/hot_tracking.h

-- 
1.7.6.5