damo supports recording data access patterns on Android

DAMON exports data access pattern of the system and workload to the user space in multiple ways. Tracepoint is one such way DAMON is using to provide the full access pattern monitoring results in real time.

DAMON user-space tool (damo) collects and visualizes the information in a handy and human-friendly way. For the collection, damo was internally using perf. On some environments including Android, perf is not available. This made use of DAMON on Android and similar platforms difficult. Kernel version dependency of perf was also one problem of poor damo user experience. Some people had to make their downstream hacks on damo, or add some workarounds.

On 2025-12-29, damo v3.0.9 is released. The version drops the perf dependency by alternatively using trace-cmd if available. Because trace-cmd is more universal than perf and has less dependency to kernel versions, users on Android and a few restricted environments can more easily use DAMON.