ZRAM (SWAP) Optimizer

ZRAM-SWAP-Optimizer Release Notes
v4.0 (2025-10-04)

Features
Automatic ZRAM Sizing:

• Detects device RAM and sets ZRAM size dynamically:

  • 4GB RAM → 3GB ZRAM
  • 6GB RAM → 5GB ZRAM
  • 8GB RAM → 6GB ZRAM
  • 12GB RAM → 8GB ZRAM

• Compression Algorithm Selection:
  Uses lz4 by default for fast compression (can be changed to zstd).

• Aggressive VM Tuning:
  Applies and periodically reapplies optimal VM parameters for swap and memory management, including:

  • swappiness, page-cluster, vfs_cache_pressure, dirty ratios, and more.
  • Logs both old and new values for transparency.

• ZRAM Writeback Support:
  Enables ZRAM writeback if supported by the kernel (with a 50MB limit).

• Fallback to Swapfile:
  If ZRAM setup fails or is unsupported, automatically creates and enables a swapfile.

• Robust Logging:
  Logs all actions, system info, and memory status to /sdcard/zram_optimizer.log for easy troubleshooting.

• Boot Delay & System Readiness:
  Waits for system boot completion before running to ensure stability.

Improvements

• Live ZRAM Resize:
  Attempts non-destructive ZRAM resizing before falling back to reset.
• Periodic VM Tuning:
  Reapplies VM settings every 5 minutes to prevent system overrides.
• Detailed Logging:
  Logs device model, kernel version, and memory stats before and after optimization.

Bug Fixes

• Ensures swapfile is cleaned up and recreated if needed.
• Handles missing or unsupported kernel features gracefully.