Optimizations & Performance Improvements For DM In Linux 3.19
Written by Michael Larabel in Linux Kernel on 9 December 2014 at 09:58 AM EST. Add A Comment
LINUX KERNEL --
Another one of the interesting early pull requests for the Linux 3.19 kernel is the Device Mapper changes.

Device Mapper, the kernel framework for mapping block devices into virtual block devices to be used for Linux software RAID, dm-crypt, LVM2, and other purposes, has seen some noteworthy improvements for this next Linux kernel cycle.

The Devie Mapper changes for Linux 3.19 include "significant DM thin-provisioning performance improvements" that were done to meet the needs of the Gluster distributed file-system. This should especially help out the performance of hardware RAID 6 devices too. Linux 3.19's Device Mapper also has optimizations in DM core and RCU dereference clean-ups, support for the new suspend/resume interface in DM core changes, DM cache discard improvements, DM cache multi-queue policy block promotion improvements, and various fixes.

Those big into using DM can find out more details via Mike Snitzer's pull request.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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