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Add and remove CPU from epoch computation on active and idle #3920

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@Alan-Jowett Alan-Jowett commented Oct 8, 2024

Description

Restore the changes reverted by 205802b and fix a bug that was causing use after free (the for loop for computing oldest epoch was malformed resulting in a no-op).

Note: This is intentionally three or more commits:

  1. Restore the reverted code (including the bug).
  2. Fix the bug.
  3. PR feedback and addition of new tests.

Testing

CI/CD + 24 hour run of api_test.exe (previously failing after 2 hours).

Documentation

Yes, in the files.

Installation

No.

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@CodiumAI-Agent /review

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CodiumAI-Agent commented Oct 8, 2024

PR Reviewer Guide 🔍

(Review updated until commit af048fb)

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 4 🔵🔵🔵🔵⚪
🧪 PR contains tests
🔒 No security concerns identified
⚡ Recommended focus areas for review

Thread Safety
The code modifies shared state without sufficient synchronization mechanisms in several places, which could lead to race conditions or data corruption in a multi-threaded environment.

Resource Leak
The new implementation introduces potential resource leaks where allocated resources on error paths are not always properly freed or handled.

Error Handling
Error paths may not correctly restore previous states, potentially leaving the system in an inconsistent state after an error.

libs/runtime/ebpf_epoch.c Outdated Show resolved Hide resolved
libs/runtime/ebpf_epoch.c Outdated Show resolved Hide resolved
@Alan-Jowett Alan-Jowett force-pushed the cpu_activation branch 6 times, most recently from 7b60ca4 to 6dfd02b Compare October 9, 2024 18:24
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@hawkinsw hawkinsw left a comment

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I hope that what I wrote isn't too annoying.

libs/runtime/unit/platform_unit_test.cpp Outdated Show resolved Hide resolved
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I hope that what I wrote isn't too annoying.

No, I loved it. I dislike that en-gb and en-us differ like this :-P

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Persistent review updated to latest commit af048fb

libs/runtime/unit/platform_unit_test.cpp Outdated Show resolved Hide resolved
libs/runtime/ebpf_epoch.c Outdated Show resolved Hide resolved
@Alan-Jowett Alan-Jowett force-pushed the cpu_activation branch 2 times, most recently from 1b357e6 to 0bb37d0 Compare October 10, 2024 18:53
@Alan-Jowett Alan-Jowett marked this pull request as draft October 16, 2024 22:14
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Converting to draft until usersim bug is fixed.

@Alan-Jowett Alan-Jowett force-pushed the cpu_activation branch 2 times, most recently from 88d6e89 to 98263a7 Compare November 3, 2024 23:00
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4 participants