New Linux Patches Aim to Better Handle Multiple Swap Devices

8 hours ago

Linux patches from Tencent aim to improve handling of multiple swap devices, especially for swap tiering and layered swap.
The new design removes the global plist and lock, introduces a percpu reader priority queue, and addresses several long-standing design issues.
Key improvements include fair distribution of I/O to swap devices, better scalability, and support for future features like swap tiering.
The patch series eliminates the global percpu cluster cache, which previously conflicted with concepts like swap tiering and caused performance issues.
It also resolves problems with device rotation, contention on global locks, and unclear rotation rules, leading to a more flexible and robust system.

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