Inline budget now has a symmetric ramp down

[mvandeberg]

Summary by CodeRabbit

• Bug Fixes
  • Improved the adaptive inline-budget scaling behavior in the reactor scheduler to reduce budget more gradually instead of completely resetting. This ensures better system stability and responsiveness during high-load conditions while preventing excessive performance drops.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 4e433211-1e22-4c5b-b386-ea64fdd8cdb0

📥 Commits

Reviewing files that changed from the base of the PR and between 18a8a2f and f91a2b7.

📒 Files selected for processing (1)

• include/boost/corosio/native/detail/reactor/reactor_scheduler.hpp

---

📝 Walkthrough

Walkthrough

The reactor_scheduler::reset_inline_budget() function has been modified to apply a gradual reduction strategy to the inline budget maximum. Instead of resetting directly to the initial value, it now reduces the maximum by half while ensuring it never drops below the initial threshold.

Changes

Cohort / File(s)	Summary
Inline Budget Reduction Logic include/boost/corosio/native/detail/reactor/reactor_scheduler.hpp	Modified reset_inline_budget() to reduce inline_budget_max to max(ctx->inline_budget_max / 2, inline_budget_initial_) instead of unconditionally resetting to inline_budget_initial_, enabling adaptive budget decay while maintaining a floor at the initial value.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 A rabbit whispers, "Half and half again!
No budget drops below where it began,
With careful math and gentle care,
We dance through reactors light as air!" 📉✨

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Inline budget now has a symmetric ramp down' accurately describes the main change: the reset_inline_budget() function now uses a symmetric halving approach instead of unconditional reset.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[cppalliance-bot]

An automated preview of the documentation is available at https://235.corosio.prtest3.cppalliance.org/index.html

If more commits are pushed to the pull request, the docs will rebuild at the same URL.

2026-04-17 20:17:27 UTC

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.71%. Comparing base (3fc8c97) to head (f91a2b7).
⚠️ Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #235   +/-   ##
========================================
  Coverage    77.71%   77.71%           
========================================
  Files           96       96           
  Lines         7298     7298           
  Branches      1787     1787           
========================================
  Hits          5672     5672           
  Misses        1108     1108           
  Partials       518      518           

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3fc8c97...f91a2b7. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[cppalliance-bot]

GCOVR code coverage report https://235.corosio.prtest3.cppalliance.org/gcovr/index.html
LCOV code coverage report https://235.corosio.prtest3.cppalliance.org/genhtml/index.html
Coverage Diff Report https://235.corosio.prtest3.cppalliance.org/diff-report/index.html

Build time: 2026-04-17 20:25:32 UTC