From: Zhi Yong Wu <wuzhy@xxxxxxxxxxxxxxxxxx> The patchset is trying to introduce hot tracking function in VFS layer, which will keep track of real disk I/O in memory. By it, you will easily know more details about disk I/O, and then detect where disk I/O hot spots are. Also, specific FS can take use of it to do accurate defragment, and hot relocation support, etc. After V1 was sent out, Chandra Seetharaman has reviewed and made a lot of comments, thanks a lot to him. Now it's time to send out its V3 for external review, any comments or ideas are appreciated, thanks. 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 review them via https://github.com/wuzhy/kernel/commits/hot_tracking For how to use and more other info and performance report, please check hot_tracking.txt in Documentation and following links: 1.) http://lwn.net/Articles/525651/ 2.) https://lkml.org/lkml/2012/12/20/199 Changelog from v2: - Added memory caping function for hot items [Zhiyong] - Cleanup aging function [Zhiyong] v2: - Refactored to be under RCU [Chandra Seetharaman] - Merged some code changes [Chandra Seetharaman] - Fixed some issues [Chandra Seetharaman] v1: - Solved 64 bits inode number issue. [David Sterba] - Embed struct hot_type in struct file_system_type [Darrick J. Wong] - Cleanup Some issues [David Sterba] - Use a static hot debugfs root [Greg KH] rfcv4: - Introduce hot func registering framework [Zhiyong] - Remove global variable for hot tracking [Zhiyong] - Add btrfs hot tracking support [Zhiyong] rfcv3: 1.) Rewritten debugfs support based seq_file operation. [Dave Chinner] 2.) Refactored workqueue support. [Dave Chinner] 3.) Turn some Micro into be tunable [Zhiyong, Liu Zheng] TIME_TO_KICK, and HEAT_UPDATE_DELAY 4.) Cleanedup a lot of other issues [Dave Chinner] rfcv2: 1.) Converted to Radix trees, not RB-tree [Zhiyong, Dave Chinner] 2.) Added memory shrinker [Dave Chinner] 3.) Converted to one workqueue to update map info periodically [Dave Chinner] 4.) Cleanedup a lot of other issues [Dave Chinner] rfcv1: 1.) Reduce new files and put all in fs/hot_tracking.[ch] [Dave Chinner] 2.) The first three patches can probably just be flattened into one. [Marco Stornelli , Dave Chinner] Zhi Yong Wu (13): VFS hot tracking: introduce some data structures VFS hot tracking: add i/o freq tracking hooks VFS hot tracking: add one wq to update hot map VFS hot tracking: register one shrinker VFS hot tracking, rcu: introduce one rcu macro for list VFS hot tracking, seq_file: add seq_list rcu interfaces VFS hot tracking: add debugfs support VFS hot tracking: add one ioctl interface VFS hot tracking, procfs: add one proc interface VFS hot tracking: add memory caping function VFS hot tracking, btrfs: add hot tracking support VFS hot tracking: add documentation VFS hot tracking: add fs hot type support Documentation/filesystems/00-INDEX | 2 + Documentation/filesystems/hot_tracking.txt | 252 ++++++ fs/Makefile | 2 +- fs/btrfs/ctree.h | 1 + fs/btrfs/super.c | 22 +- fs/compat_ioctl.c | 5 + fs/dcache.c | 2 + fs/direct-io.c | 5 + fs/hot_tracking.c | 1318 ++++++++++++++++++++++++++++ fs/hot_tracking.h | 87 ++ fs/ioctl.c | 70 ++ fs/namei.c | 2 + fs/seq_file.c | 37 + include/linux/fs.h | 5 + include/linux/hot_tracking.h | 176 ++++ include/linux/rculist.h | 5 + include/linux/seq_file.h | 7 + kernel/sysctl.c | 21 + mm/filemap.c | 6 + mm/page-writeback.c | 12 + mm/readahead.c | 6 + 21 files changed, 2041 insertions(+), 2 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 -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
