koordlet: fix not support cpu without L3 cache

[shelwinnn]

Ⅰ. Describe what this PR does

Fix lscpu get cache info failed when the cpu has no L3 cache.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

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

Base: 66.96% // Head: 66.97% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (e13006e) compared to base (388f7ad).
Patch coverage: 0.00% of modified lines in pull request are covered.

❗ Current head e13006e differs from pull request most recent head 71b0de7. Consider uploading reports for the commit 71b0de7 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #960      +/-   ##
==========================================
+ Coverage   66.96%   66.97%   +0.01%     
==========================================
  Files         243      243              
  Lines       28240    28244       +4     
==========================================
+ Hits        18910    18917       +7     
+ Misses       8035     8032       -3     
  Partials     1295     1295              

Flag	Coverage Δ
unittests	66.97% <0.00%> (+0.01%)	⬆️

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

Impacted Files	Coverage Δ
pkg/koordlet/util/system/lscpu.go	0.00% <0.00%> (ø)
pkg/koordlet/runtimehooks/reconciler/reconciler.go	65.88% <0.00%> (+4.11%)	⬆️

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[saintube]

@shelwinnn It seems to be a compatibility problem. Could you please add more information about your system environment and what the lscpu's output (lscpu -e) is like?

[shelwinnn]

@shelwinnn It seems to be a compatibility problem. Could you please add more information about your system environment and what the lscpu's output (lscpu -e) is like?

On my company's cloud, we use kvm as the cloud host and qemu-kvm not enable L3 cache, see: https://bugzilla.redhat.com/show_bug.cgi?id=1434537

lscpu -e=CPU,NODE,SOCKET,CORE,CACHE,ONLINE output:

CPU NODE SOCKET CORE L1d:L1i:L2    ONLINE
 0    0      0    0  0:0:0            yes
 1    0      0    1  1:1:1            yes
 2    0      0    2  2:2:2            yes
 3    0      0    3  3:3:3            yes
 4    0      1    4  4:4:4            yes
 5    0      1    5  5:5:5            yes
 6    0      1    6  6:6:6            yes
 7    0      1    7  7:7:7            yes

[saintube]

/lgtm
PTAL @jasonliu747 @zwzhang0107

[jasonliu747]

/lgtm

[saintube]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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