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@Jialin Jialin commented Jul 22, 2025

Essential Elements of an Effective PR Description Checklist

  • The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
  • The test plan, such as providing test command.
  • The test results, such as pasting the results comparison before and after, or e2e results
  • (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

Purpose

#21281 breaks the cache block eviction logic which was fixed by #21357 (Kudos to @simon-mo)

Introduce a unit test to at least cover some basic logic for _maybe_evict_cached_block.

Test Plan

Reject the error to ensure unit test failed.

Test Result

Test failed after locally reverted the fix PR.

Screenshot 2025-07-22 at 11 50 26 AM

(Optional) Documentation Update

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👋 Hi! Thank you for contributing to the vLLM project.

💬 Join our developer Slack at https://slack.vllm.ai to discuss your PR in #pr-reviews, coordinate on features in #feat- channels, or join special interest groups in #sig- channels.

Just a reminder: PRs would not trigger full CI run by default. Instead, it would only run fastcheck CI which starts running only a small and essential subset of CI tests to quickly catch errors. You can run other CI tests on top of those by going to your fastcheck build on Buildkite UI (linked in the PR checks section) and unblock them. If you do not have permission to unblock, ping simon-mo or khluu to add you in our Buildkite org.

Once the PR is approved and ready to go, your PR reviewer(s) can run CI to test the changes comprehensively before merging.

To run CI, PR reviewers can either: Add ready label to the PR or enable auto-merge.

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Code Review

The test setup for test_maybe_evict_cached_block uses pool.blocks directly, including the null_block which is a special block that should not be cached or be part of the regular block pool logic. The test should only operate on non-null blocks by creating a pool with an extra block and then allocating the test blocks from the free queue. Also, using block.block_id in assertions instead of hardcoding block IDs will make the test more resilient to future changes.

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thx for adding the tests

@DarkLight1337 DarkLight1337 enabled auto-merge (squash) July 23, 2025 03:49
@github-actions github-actions bot added the ready ONLY add when PR is ready to merge/full CI is needed label Jul 23, 2025
@vllm-bot vllm-bot merged commit a1f3610 into vllm-project:main Jul 23, 2025
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3 participants