balloon_check: get previous memory before initial check

[xiagao]

The original logic is getting previous memory before balloon test and balloon check, it's also needed before the initial check.
ID: 4755

Summary by CodeRabbit

Release Notes

• Refactor
  • Enhanced diagnostic logging in memory balloon tests by reordering memory checks and providing detailed pre-ballooning memory value output for improved visibility.

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[coderabbitai]

Walkthrough

The pull request modifies qemu/tests/balloon_check.py in the run_ballooning_test function. The pre-ballooning memory check is repositioned to occur after the assignment of self.pre_mem and self.pre_gmem variables. A new logging statement is added to output memory values before ballooning begins. The first test round check remains in place but is now executed following the new log output. No control flow logic or functional behavior is altered; only the execution order and logging are adjusted.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ 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 clearly and concisely summarizes the main change: retrieving previous memory before the initial check in the balloon test.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 89b4300 and 345510c.

📒 Files selected for processing (1)

• qemu/tests/balloon_check.py

🔇 Additional comments (1)

qemu/tests/balloon_check.py (1)

348-359: LGTM! Logical improvement to test flow.

The reordering ensures that fresh memory values are captured (lines 348-349) before the initial check (line 358), and the new logging (lines 351-356) improves observability. This change correctly implements the PR objective of retrieving previous memory before the initial check.

The condition at line 357 ensures the initial check runs only during the first test round, which is appropriate for baseline validation.

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[xiagao]

@leidwang call for your review, thanks.

[xiagao]

@leidwang call for your review, thanks.

[leidwang]

LGTM. Sorry for the delay!