Linux 5.4 Development, PRs, Merges
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BLK-IOCOST Merged For Linux 5.4 To Better Account For Cost Of I/O Workloads
BLK-IOCOST is a new I/O controller by veteran kernel developer Tejun Heo that is a work-conserving proportional controller. He goes over blk-iocost in great detail in one of the earlier patch series, "It currently has a simple linear cost model builtin where each IO is classified as sequential or random and given a base cost accordingly and additional size-proportional cost is added on top. Each IO is given a cost based on the model and the controller issues IOs for each cgroup according to their hierarchical weight. By default, the controller adapts its overall IO rate so that it doesn't build up buffer bloat in the request_queue layer, which guarantees that the controller doesn't lose significant amount of total work...The controller provides extra QoS control knobs which allow tightening control feedback loop as necessary." See that aforelinked article for more details and results.
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Btrfs & XFS File-Systems See More Fixes With Linux 5.4
The mature XFS and Btrfs file-systems continue seeing more fixes and cleaning with the now in-development Linux 5.4 kernel.
On the Btrfs front the Linux 5.4 changes are summed up as "work on code refactoring, sanity checks and space handling. There are some less user visible changes, nothing that would particularly stand out." The Btrfs changes include deprecating a few items as well as improving the exposure of debugging information via sysfs. See the pull request for all the Btrfs file-system fixes and changes this round.
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Linux 5.4 DRM Pull Submitted With AMD Navi 12/14, Arcturus & Renoir Plus Intel Tigerlake
While we've known about the many features for a while if you are a faithful Phoronix reader, today the Direct Rendering Manager (DRM) graphics driver changes were sent in for the Linux 5.4 kernel.
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EXT4 Brings New Debugging Ioctls For Linux 5.4
EXT4 Brings New Debugging Ioctls For Linux 5.4