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We describe about a userspace daemon that integrates with the Linux kernel's Pressure Stall Information (PSI) mechanism to monitor and detect memory pressure events, and requests for adding/removing memory blocks from the host based on real-time memory demands in the system without need for intervention of an admin/host. The virtio-mem interface is used for communicating with the host for adding/removing memory blocks.
Detecting increase in memory demand – the daemon registers to certain PSI events and monitors pressure building up when memory allocations occurs. Using these predefined thresholds trigger the daemon to request additional memory from the host when minimal pressure is detected, indicating an active memory-intensive use case is running.
Detecting decrease in memory pressure – the daemon monitors pressure decay and psi averages (avg10, avg60, avg300) along with other memory stats. and makes an educated guess about memory usecases have ended and releases blocks back to host. The process of tracking memory pressure going down and releasing memory back to host is done in a separate thread.
More details on design and logic will be explained in the presentation session.
Working as Linux Kernel Developer in Qualcomm for the past 7 years. Interests are in Embedded Systems and Firmware, System designs and Computer Architecture.
