[Chore] Add note in S3FIFO for small insertion

[haochengxia]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @haochengxia, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request is a chore that enhances the readability and maintainability of the S3FIFO cache implementation. It introduces a critical explanatory comment to clarify the design decision behind preventing the insertion of oversized objects into the small FIFO, thereby improving understanding for current and future developers.

Highlights

• Code Clarity & Documentation: Added a multi-line comment within the S3FIFO_insert function in libCacheSim/cache/eviction/S3FIFO.c to explain the rationale behind the size check for objects being inserted into the small FIFO. This note clarifies why inserting an object equal to the cache's size is disallowed, as it would undesirably evict all existing objects.

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[gemini-code-assist]

Code Review

This pull request adds a comment to explain a check in the S3-FIFO insertion logic. My review focuses on improving the accuracy of this new comment, as it currently contains misleading information about the cache size being checked. I've suggested a more precise comment to enhance code clarity and maintainability.