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[release-v0.65.x] adding efficient polling to waitForStepsToFinish #8911

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[release-v0.65.x] adding efficient polling to waitForStepsToFinish #8911

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Manual Cherry-pick of #8901

#8901 (comment)

/kind bug

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

  • Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
  • Has Tests included if any functionality added or changed
  • pre-commit Passed
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  • Has a kind label. You can add one by adding a comment on this PR that contains /kind <type>. Valid types are bug, cleanup, design, documentation, feature, flake, misc, question, tep
  • Release notes block below has been updated with any user facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings). See some examples of good release notes.
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Release Notes

The log results sidecar has been optimized to significantly reduce CPU utilization.  Operators can tune the system for their environment—using a higher interval to reduce CPU load in production, or a lower interval for faster feedback in development or testing.

@pritidesai
adding efficient polling to waitForStepsToFinish
cae2c27 
The current waitForStepsToFinish implementation is a classic busy-wait.
It checks for file existence without any sleep, resulting in a high
CPU usage. Adding a profile with a unit test to show that almost all
time is spent in system calls with a high total sample count. This led to
execssive CPU usage by the sidecar even when just waiting.

The function now sleeps 100ms between checks, drastically reducing the
frequency. The sidecar now uses minimal CPU while waiting.

Signed-off-by: Priti Desai <[email protected]>
@tekton-robot tekton-robot added release-note Denotes a PR that will be considered when it comes time to generate release notes. kind/bug Categorizes issue or PR as related to a bug. labels Jul 24, 2025
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[APPROVALNOTIFIER] This PR is NOT APPROVED

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@tekton-robot tekton-robot requested review from afrittoli and dibyom July 24, 2025 21:41
@tekton-robot tekton-robot added the size/L Denotes a PR that changes 100-499 lines, ignoring generated files. label Jul 24, 2025
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The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage-df to re-run this coverage report

File Old Coverage New Coverage Delta
internal/sidecarlogresults/sidecarlogresults.go 87.6% 87.5% -0.1
pkg/pod/pod.go 93.4% 92.9% -0.4

@pritidesai
refactor getSidecarLogPollingInterval()
f90fbb5 
Introducing getSidecarLogPollingInterval() to avoid repeating the same
logic across two different functions.

Signed-off-by: Priti Desai <[email protected]>
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The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage-df to re-run this coverage report

File Old Coverage New Coverage Delta
pkg/pod/pod.go 93.4% 92.9% -0.4

@vdemeester @pritidesai
Remove all reference to gcr.io tekton projects
0665f10 
There was still a few references that makes the CI fail. This should
fix it.

Signed-off-by: Vincent Demeester <[email protected]>
@tekton-robot tekton-robot added size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. and removed size/L Denotes a PR that changes 100-499 lines, ignoring generated files. labels Aug 1, 2025
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The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage-df to re-run this coverage report

File Old Coverage New Coverage Delta
pkg/pod/pod.go 93.4% 92.9% -0.4

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/retest

2 similar comments
@l-qing
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l-qing commented Sep 5, 2025

/retest

@waveywaves
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/retest

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l-qing commented Sep 14, 2025

We might need to cherry-pick this commit for the pipeline to succeed. 5f38010

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@afrittoli afrittoli Awaiting requested review from afrittoli

@dibyom dibyom Awaiting requested review from dibyom

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