Claude review: Let userspace know about swapped out panthor GEM objects

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Overall Series Review

Subject: Let userspace know about swapped out panthor GEM objects
Author: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Patches: 8
Reviewed: 2026-05-25T21:52:45.981861

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This is a clean, well-structured 3-patch series that adds eviction observability to the DRM fdinfo framework and implements it in the panthor driver. The motivation is sound — distinguishing evicted-to-swap objects from newly-allocated-but-not-yet-backed objects is genuinely useful for memory debugging. The series is at v4 and already carries Reviewed-by from Steven Price.

The patches are logically ordered: framework first (patch 1), driver implementation (patch 2), cosmetic cleanup (patch 3). The code is straightforward and well-documented.

One design concern exists in the framework code (patch 1) regarding how `add_size` is computed for evicted objects — it's correct for panthor but could be incorrect for future drivers that implement `rss()`. This is a minor concern since panthor is the only user today.

**Verdict:** Series looks good. One minor design concern worth discussing with maintainers, but not a blocker for merging.

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