| name | android-mthp-experiment-archive-20260629 |
| description | Archived Pixel common mTHP/order-0 experiment code from June 2026, including debugfs counters, tracepoints, swap birth records, VMA suitability attribution, UFFD/madvise/deferred-split instrumentation, and restore instructions. Use when asked to restore or inspect the archived high-overhead mTHP experiment patches. |
Android mTHP Experiment Archive 20260629
This archive preserves the high-overhead Pixel common mTHP experiment code that was removed from the active tree because it affects performance.
Kernel tree:
/home/nzzhao/learn_os/pixel/common
Archived state:
- Base before the full mTHP experiment stack:
dd369db1d7f5
- Full committed experiment stack:
dd369db1d7f5..700e6147efec16084c99d190eebcd2bb04ebaf51
- Last experiment commit:
700e6147efec16084c99d190eebcd2bb04ebaf51
- Dirty worktree patch: additional uncommitted counters, tracepoints, and
mthp_experiment data structures.
Files:
patches/0000-full-committed-mthp-experiment-stack.patch: full committed stack, including file-page/order-2, mmap alignment, zram large compression, direct reclaim counters, VMA/deferred-split/madvise trace, and the final committed trace enrichments.patches/0001-head-mthp-experiment-commit.patch: the committed experiment layer.patches/0002-dirty-mthp-experiment-worktree.patch: the uncommitted experiment layer.snapshots/include-linux-mthp_experiment.h: full header snapshot for the dirty layer.snapshots/mm-mthp_experiment.c: full implementation snapshot for the dirty layer.references/restore.md: exact restore commands and notes.references/inventory.md: what this experiment code contained.
Use policy:
- Do not apply this archive during normal kernel builds.
- Restore only for targeted trace/counter experiments.
- After applying, rebuild and reboot before trusting performance data.
- Expect measurable overhead from tracepoints, per-cpu counters, debugfs reads, and swap birth-record tracking.
Quick restore:
cd /home/nzzhao/learn_os/pixel/common
git am /home/nzzhao/.agents/skills/archive/android-mthp-experiment-20260629/patches/0000-full-committed-mthp-experiment-stack.patch
git apply /home/nzzhao/.agents/skills/archive/android-mthp-experiment-20260629/patches/0002-dirty-mthp-experiment-worktree.patch
Read references/restore.md before restoring into a tree that has moved forward.
