- Compact v0.9 (Wake-path latency) into Shipped; record the RFC 004 spinning
excision as a deviation (preserved on branch rfc-004-spinning).
- Drop the v0.7 entry, folding its reference into the Shipped history pointer.
- Promote Process groups from Later into the up-next slot v0.9 vacated;
Per-switch cost now leads Later/Highest priority.
The spinning experiment is excised from master. Drops the two dedicated v0.9
sections describing it. Inline RFC-004 mentions in the v0.9 intro and the
queue-topology decision record are intentionally left for a manual short-term
-plan pass.
Carries forward the non-spin parts of the dropped spin-tooling commit:
- .gitignore: __pycache__/ and *.pyc
- sweep.py: generic vs-tokio comparison summary (no spin_sweep coupling)
The spin_sweep README docs from that commit are intentionally left behind.
The profile was captured against the spin-enabled build. With the RFC 004
spinning experiment excised from master, the ~12% hot-path futex_wake it
attributed to the spinning submit-rule no longer exists (idle wait is back to
thread::sleep). Add a provenance note, mark the futex_wake row/finding as
excised spin machinery, and drop the now-moot 'gate the submit wake' lead.
Spin-independent findings (shims ~1%, schedule_loop + run-queue ~33%) unchanged.
smarm-agent