Claude review: drm/ttm, drm/xe: Avoid reclaim/eviction loops under fragmentation

[Claude Code Review Bot <claude-review@example.com>]

Overall Series Review

Subject: drm/ttm, drm/xe: Avoid reclaim/eviction loops under fragmentation
Author: Matthew Brost <matthew.brost@intel.com>
Patches: 12
Reviewed: 2026-04-23T09:01:58.435382

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This is a well-motivated 3-patch series addressing a real and well-documented pathological reclaim loop on Xe iGPU systems under memory fragmentation. The cover letter clearly describes the problem (kswapd → shrinker → eviction → rebind loop at ~2 FPS) and demonstrates measurable improvement (~10 FPS, restored buddyinfo).

The approach is sound: (1) teach TTM to only do reclaim at the order the driver actually benefits from, (2) tell TTM that Xe cares about order 9 (2MB), and (3) add a heuristic in the Xe shrinker to detect fragmentation-driven kswapd invocations and bail out early.

However, Patch 1 has a significant semantic expansion beyond what the commit message emphasizes, and Patch 3 has some robustness concerns around the ZONE_NORMAL hardcoding. Overall the series is reasonable but warrants discussion on these points.

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