koordlet: optimize perf group cpi collection

[bowen-intel]

Ⅰ. Describe what this PR does

By reusing unix.PerfEventAttr, we can decrease cgo calls, and remove goroutines to alleviate read pressure during CPI data collection.

Ⅱ. Does this pull request fix one issue?

fixes #1884

Ⅲ. Describe how to verify it

ps -eLf | grep koordlet | wc -l
pidstat -p xxx 1

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

Attention: Patch coverage is 62.71186% with 22 lines in your changes are missing coverage. Please review.

Project coverage is 67.58%. Comparing base (ce9c870) to head (0711179).
Report is 19 commits behind head on main.

Files	Patch %	Lines
pkg/koordlet/util/perf_group/perf_group_linux.go	62.71%	16 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1905      +/-   ##
==========================================
+ Coverage   67.26%   67.58%   +0.31%     
==========================================
  Files         410      413       +3     
  Lines       45662    46171     +509     
==========================================
+ Hits        30715    31205     +490     
+ Misses      12734    12703      -31     
- Partials     2213     2263      +50     

Flag	Coverage Δ
unittests	67.58% <62.71%> (+0.31%)	⬆️

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[zwzhang0107]

@songtao98

[zwzhang0107]

the fix looks good, it will be better if there are some comparison about performance before/after the fix.

also, dose PerfCollector has the same problem? @songtao98

[bowen-intel]

the fix looks good, it will be better if there are some comparison about performance before/after the fix.

also, dose PerfCollector has the same problem? @songtao98

environment

result

sudo perf trace -p `ps aux | grep koordlet | head -n 1 | awk '{print $2}'` -s -- sleep 360 # I just show one thread
ps -eLf | grep koordlet | wc -l

old version

new version

[zwzhang0107]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: zwzhang0107

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