LMKD PSI Activator 🚀💾

A Magisk module to supercharge RAM management by activating PSI mode in LMKD, offering a faster, more stable, and more efficient alternative to outdated minfree_levels-based memory management.

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⚠️ CAUTION – MIUI USERS
This module may cause MIUI to aggressively kill apps like VPNs.
Fix: Install the NoSwipeToKill LSPosed module by dantmnf.

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✨ Features

• 🗑️ UFFD Garbage Collection – Activates Userfaultfd (UFFD) garbage collection, optimizing memory management and reducing swap-related overhead.
• 🔄 ZRAM Deduplication – Enables data deduplication in ZRAM (if supported by kernel). Deduplicate ZRAM data to reduce amount of memory consumption.
• 🚀 Multi-ZRAM Support – Dynamically manages multiple ZRAM partitions for better memory management.
• 📂 Swap Creation & Removal – Manage swap on demand via action.sh (max swap = RAM size).
• 📈 Incremental Dynamic Swap – Implements adaptive swap expansion, progressively adjusting swap size based on real-time system memory pressure.
• ⚡ Migrated to C++ – Rewritten in C++ for faster execution, lower CPU utilization, and improved overall system stability compared to older implementations.
• 🔄 Advanced Dynamic Swappiness – Adjusts swappiness in real-time depending on memory pressure, ensuring an optimal balance between performance and responsiveness.
• 🛠️ LMKD PSI Optimizations – Fine-tuned Low Memory Killer Daemon (LMKD) PSI parameters, improving low-memory handling and responsiveness based on real-world testing.
• 📝 YAML-Based Configuration – Customizable settings via config.yaml.
• 📊 Memory Pressure Monitoring – Reports live RAM pressure through Magisk.

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🔧 Configuration

• Uses a YAML config file for flexible tuning.

• Located at:

  Internal storage → Android/fmiop/config.yaml
  

📜 Example config.yaml

config_version: 0.6
dynamic_swappiness:
  swappiness_range:
    max: 100
    min: 80
  threshold:
    cpu_pressure: 40
    memory_pressure: 15
    io_pressure: 30
  step: 2
  apply_step: 20
virtual_memory:
  enable: true
  pressure_binding: false
  deactivate_in_sleep: true
  wait_timeout: 10
  zram:
    activation_threshold: 75
    deactivation_threshold: 55
  swap:
    activation_threshold: 90
    deactivation_threshold: 40

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📖 Explanation of Key Settings

🌀 Dynamic Swappiness

• swappiness_range – Controls swap aggressiveness:
  • Low (e.g., 60) – Favors RAM, keeps apps in memory.
  • High (e.g., 100) – Frees RAM quickly, better for multitasking.
• threshold – Adjusts swappiness based on system pressure:
  • cpu_pressure – CPU load threshold.
  • memory_pressure – Memory usage threshold.
  • io_pressure – I/O operations threshold.
• step – Swappiness increment per adjustment (higher = more aggressive).
• apply_step – how many step to when to adjust swappiness. Too often swappiness update affect performance.

🗃️ Virtual Memory (VM) Optimization

• enable – Enables VM optimizations (recommended for multitasking).
• pressure_binding – Enables swap only when system pressure is high (EXPERIMENTAL).
• deactivate_in_sleep – Only deactivate in sleep to be more battery friendly.
• zram – Handles incremental ZRAM management:
  • activation_threshold – % usage of last ZRAM partition before a new one is activated.
  • deactivation_threshold – MB size where ZRAM is released.
• swap – Handles incremental swap management:
  • activation_threshold – % system pressure before swap is enabled.
  • deactivation_threshold – MB size where swap is released.

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📂 Source Code & Contributions

💻 View full source code & contribute:
🔗 LMKD-PSI-Activator Repository

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🛠️ TODO

• MIUI Fix – Install NoSwipeToKill by dantmnf for better compatibility.

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🚀 TL;DR – What This Module Does:

✔️ Boosts RAM performance 🔥
✔️ Smarter ZRAM & swap handling 📈
✔️ Dynamic memory tuning 🧠
✔️ C++ powered speed & efficiency ⚡

This isn't just a tweak—it’s a real optimization for smoother performance! 🏎️💨