- Switched the kernel's file path lookup cache to use faster per-directory red-black trees.
- Improved scheduler performance, including the ability to more appropriately spread load on a mixture of slow and fast cores (e.g. big.LITTLE Arm CPUs).
- Various optimizations for the machine-independent virtual memory system:
- Switched to a faster radix tree algorithm for memory page lookups.
- Improved tracking of clean/dirty pages, speeding up fsync(2) on large files by orders of magnitude.
- Improved parallelization: rewritten page allocator with awareness of CPU topology, replaced global counters with per-CPU counters, and reduced lock contention.
- Improved the performance of the select(2) and poll(2) system calls.
- Improved the performance of
tmpfs. implemented lazy update of atime/mtime. - Various optimizations of architecture-dependent x86 and AArch64 code, vastly improved network and I/O throughput on aarch64.
- Various boot speed improvements.
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