cgroup: refine the handling of error 'no cpu controller detected'

[hnes]

What problem does this PR solve?

Issue Number: Ref #5953

What is changed and how does it work?

Ignore error 'no cpu controller detected' on old kernel but still panic on new kernel. (Thanks a lot for the advice from @nolouch)
Remove TestGetCgroupCPU from the flaky test list.

Reference:
pingcap/tidb#41347
pingcap/tidb#41475

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• nolouch

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[ti-chi-bot]

Hi @hnes. Thanks for your PR.

I'm waiting for a tikv member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[hnes]

/cc @nolouch

[codecov]

Codecov Report

Base: 75.09% // Head: 75.32% // Increases project coverage by +0.23% 🎉

Coverage data is based on head (4cf1374) compared to base (c499e01).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 4cf1374 differs from pull request most recent head 00b04b8. Consider uploading reports for the commit 00b04b8 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5999      +/-   ##
==========================================
+ Coverage   75.09%   75.32%   +0.23%     
==========================================
  Files         362      362              
  Lines       36316    36316              
==========================================
+ Hits        27270    27356      +86     
+ Misses       6668     6612      -56     
+ Partials     2378     2348      -30     

Flag	Coverage Δ
unittests	75.32% <100.00%> (+0.23%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/cgroup/cgroup_cpu.go	78.12% <100.00%> (ø)
...erver/config/service_middleware_persist_options.go	91.66% <0.00%> (-8.34%)	⬇️
pkg/storage/endpoint/meta.go	63.63% <0.00%> (-2.28%)	⬇️
server/config/persist_options.go	91.98% <0.00%> (-0.65%)	⬇️
client/base_client.go	83.17% <0.00%> (-0.47%)	⬇️
client/client.go	70.75% <0.00%> (-0.11%)	⬇️
server/cluster/cluster.go	81.63% <0.00%> (ø)
server/server.go	75.51% <0.00%> (+0.51%)	⬆️
server/statistics/store_collection.go	91.56% <0.00%> (+0.60%)	⬆️
server/schedule/operator/step.go	77.30% <0.00%> (+0.67%)	⬆️
... and 19 more

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[nolouch]

/ok-to-test

[nolouch]

lgtm

[lhy1024]

/merge

[ti-chi-bot]

@lhy1024: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 00b04b8