1. Computers
  2. Display Drivers
  3. Graphics Cards
  4. Memory
  5. Motherboards
  6. Processors
  7. Software
  8. Storage
  9. Operating Systems


Facebook RSS Twitter Twitter Google Plus


Phoronix Test Suite

OpenBenchmarking.org

Linux Kernel Gets Hot-Data Tracking

Linux Kernel

Published on 10 October 2012 10:27 AM EDT
Written by Michael Larabel in Linux Kernel
5 Comments

Patches continue to be developed for the Linux kernel that provide hot-data tracking support for file-systems. This hot-data tracking feature may lead to performance improvements when dealing with commonly used data on the disk. Currently this feature has been developed with Btrfs in mind, but could be adapted to other Linux file-systems.

The VFS hot-data tracking patches are now up to their third revision. While the Linux 3.7 merge window is currently open, the hot-data tracking patches are not quite ready yet with still a TODO list of eight items open after the v3 patches were published. It looks like hot-data tracking will burn the Linux 3.8 kernel at the earliest.

Linux kernel hot-data tracking is for tracking data "temperature" information in the VFS layer. The Linux kernel VFS layer stores some statistics like the number of reads/writes, last read/write times, read/write frequency, etc. Those various data points are then turned into a single data "temperature" to determine what data on the disk is "hot" -- i.e. the most used data on the disk. The hot data can then be moved to a solid-state drive (SSD) automatically or dealt with in other manners. The long-term development goal is for allowing Btrfs to intelligently use SSDs in a heterogeneous volume. Btrfs has long desired hot-data relocation and now it's finally coming to reality.

While the initial patches implement hot-data tracking only for the Btrfs file-system, with a bulk of the hot-data work being done in the VFS layer, other file-systems could tap into this feature too. With all the patches applied, the Btrfs file-system needs to be mounted with a hot_track mount option for the feature to be actually flipped on. Hot-data statistics are also exposed over debugfs.

The patches for those interested can be found on the kernel mailing list.

About The Author
Michael Larabel is the principal author of Phoronix.com and founded the web-site in 2004 with a focus on enriching the Linux hardware experience and being the largest web-site devoted to Linux hardware reviews, particularly for products relevant to Linux gamers and enthusiasts but also commonly reviewing servers/workstations and embedded Linux devices. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics hardware drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated testing software. He can be followed via and or contacted via .
Latest Linux Hardware Reviews
  1. Btrfs On 4 x Intel SSDs In RAID 0/1/5/6/10
  2. AMD Radeon R9 290 On Ubuntu 14.10: RadeonSI Gallium3D vs. Catalyst
  3. MSI X99S SLI PLUS On Linux
  4. NVIDIA GeForce GTX 970 Offers Great Linux Performance
Latest Linux Articles
  1. NVIDIA's Linux Driver Can Deliver Better OpenGL Performance Than Windows 8.1
  2. Windows 8.1 vs. Ubuntu 14.10 With Intel HD Graphics
  3. 6-Way Ubuntu 14.10 Radeon Gallium3D vs. Catalyst Driver Comparison
  4. NVIDIA vs. Nouveau Drivers On Ubuntu 14.10
Latest Linux News
  1. AMD On Linux & Systemd Were Very Popular This Month
  2. Wine 1.7.30 Continues Work On DirectWrite & Offers Regedit Fixes
  3. Has The Sky Fallen? Qualcomm Contributes To Freedreno's DRM/KMS Driver
  4. Manjaro Works To Make Calamares A Distribution-Independent Installer
  5. DisplayLink USB 3.0 Support Sounds Like A Mess
  6. PulseAudio Gains A Native Bluetooth Headset Backend
  7. X.Org Foundation Decides On Its Women Outreach Project
  8. GTK+ 3.16's New GtkGLArea Widget Gets Improved
  9. X.Org Server 1.17 ABI Bumped
  10. Fedora 21 Beta To Be Released Next Week
Latest Forum Discussions
  1. Step by Step install of Latest Nvidia Driver Article Request
  2. How to get rid of Linux
  3. Closed source to opensource
  4. What Would You Like To See Next?
  5. Is foolish currently develop in machine code, hexadecimal and assembly?
  6. Reducing The CPU Usage In Mesa To Improve Performance
  7. Help diagnosing problems with a Readon HD 4670 on Mesa 10.3.2-1
  8. Advertisements On Phoronix