Linux Kernel 6.15 Officially Released: Improved Memory Management, Filesystem Performance, and More
Linux Kernel 6.15 Officially Released: Improved Memory Management, Filesystem Performance, and More
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Linux Kernel 6.15 Officially Released: Improved Memory Management, Filesystem Performance, and More
On May 26, linuxiac reported that after a brief delay caused by a critical vulnerability report, Linus Torvalds officially announced the release of Linux Kernel 6.15.
According to Torvalds, a last-minute issue forced the team to disable a new feature to maintain stability. Despite this setback, the release still brings a wide range of enhancements and optimizations.
Block Layer Improvements
Linux 6.15 introduces support for hardware-wrapped inline encryption keys, enabling transparent disk encryption without software overhead. Additionally, a new memory statistics feature for cgroups, called “dmem”, enhances memory tracking and management for containers and cgroups, offering more precise insights into device memory usage.
Memory Management Enhancements
The kernel sees a significant overhaul in key locking mechanisms and allocation primitives. For instance, per-VMA locks have been refactored to use reference counting, reducing contention and simplifying code paths. A new defrag_mode sysctl has been added to the memory allocator, helping reduce fragmentation and significantly improving workloads that depend on huge pages.
Filesystem Updates
On the filesystem front, Bcachefs gains improved data recovery capabilities. Btrfs introduces finer control over compression settings, while F2FS moves closer to adopting the modern mount API. Both Ext4 and XFS receive notable improvements in performance and error handling.
Networking and Security
Networking enhancements include more robust NFS and SMB client behavior in containerized environments and authentication workflows. In terms of security, the Landlock sandbox now provides broader auditing capabilities, and SELinux introduces new permission control options.
Architecture and Driver Support
Architectural updates span platforms such as ARM, RISC-V, and x86, with new device tree entries and various bug fixes. Notably, RISC-V now supports bfloat16. On the driver side, updates include improvements in graphics, power management, and USB, with new features added for Intel display engines and AMDGPU.
Availability
Linux Kernel 6.15 is now available for download on kernel.org. Users of rolling release distributions like Arch Linux will be among the first to receive the update through official repositories, while other distributions are expected to follow in the coming days or weeks.
