DAMON Subsystem Expands with Tiering and THP Monitoring at 2026 Linux Summit
Major DAMON Update Unveiled at 2026 Linux Summit
At the 2026 Linux Storage, Filesystem, Memory Management, and BPF Summit, SeongJae Park, the creator of the DAMON subsystem, announced a series of powerful new features. The update includes support for memory tiering, transparent huge pages monitoring, and data attribute tracking—marking a significant leap for kernel-based memory management.
DAMON, which stands for Data Access Monitoring, provides user-space tools to monitor and manage system memory. This year's presentation highlighted rapid development since the last summit, with Park describing the subsystem as evolving from a simple monitoring framework into a comprehensive memory management engine.
Background
DAMON was first introduced to the Linux kernel to give developers fine-grained visibility into memory access patterns. Over successive releases, it has gained capabilities for proactive memory optimization, such as cold page detection and automatic reclaim.
The subsystem has become a regular feature of the annual Linux storage and memory summit. Each year, Park presents an update on new features and ongoing development, reflecting the kernel community's growing interest in intelligent memory management.
New Features at a Glance
The 2026 update focuses on three core areas:
- Memory tiering: Allows DAMON to manage heterogeneous memory systems (e.g., DRAM + persistent memory) by monitoring access patterns across tiers.
- Transparent huge pages monitoring: Enables real-time tracking of THP utilization, helping to optimize large-page allocation and fragmentation.
- Data attributes monitoring: Exposes metadata about memory regions (e.g., read/write frequency, access locality) to user-space tools for advanced policy decisions.
Park also hinted at experimental support for self-tuning memory policies, where DAMON adjusts kernel parameters automatically based on observed workloads.
What Experts Are Saying
"DAMON is moving from a monitoring framework to a full-fledged memory management engine," said Park during his presentation. "These new capabilities allow the kernel to make smarter, more adaptive memory decisions without manual tuning."
Veteran kernel developer Andrea Righi commented, "The tiering support is a game-changer for systems with non-uniform memory. It will make DAMON indispensable for data center workloads."
What This Means
For system administrators and cloud operators, these features promise more efficient memory utilization across diverse hardware. Memory tiering can reduce latency by placing frequently accessed data in faster tiers, while THP monitoring helps avoid performance cliffs from large-page fragmentation.
Developers building user-space memory management tools will gain richer data from DAMON's new attributes. This could enable more precise garbage collection, cache tuning, and virtual machine memory balancing.
The update also signals that the Linux kernel is increasingly embracing proactive memory management, moving beyond reactive swapping to continuous optimization. As hardware architectures become more complex—with CXL, tiered DRAM, and persistent memory—DAMON's evolution is likely to accelerate.
Next Steps
The new features are expected to be merged into the mainline kernel for the 6.12 development cycle. Park encouraged community testing via the DAMON mailing list, noting that real-world feedback is critical for tuning tiering thresholds and THP parameters.
For those interested in deeper technical details, the full summit presentation slides are available on the Linux Foundation event page.