Will removing read-only THP break my Linux server?

Nope. Unless you custom-built with it enabled — rare. Distros ignored it.

What replaced read-only transparent huge pages?

Nothing direct. Multi-Gen LRU and refined anon THP handle the load better.

Why did Linux promise writable THP but remove read-only instead?

Perf regressions. Memory subsystem outgrew the idea. Promises? Kernel's eternal optimism.

Linux Kernel Axes Read-Only Huge Pages After Six Years of Hot Air

Server admins tweaking kernel configs for that extra memory oomph? Tough luck. Read-only transparent huge pages are getting yanked after years of unkept promises.

theAIcatchup Apr 10, 2026 4 min read

Linux kernel Kconfig screen showing read-only THP option crossed out

⚡ Key Takeaways

Read-only THP for page cache is gone after 6 years, unfulfilled writable promise intact in Kconfig. 𝕏
Minimal user impact — most never used it — but signals kernel's aggressive feature pruning. 𝕏
Shows evolution: Multi-Gen LRU makes old hacks obsolete. 𝕏

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#Linux kernel #THP page cache #mTHP #memory management #page cache #transparent huge pages

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Originally reported by LWN.net

⚡ Key Takeaways

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