enhance: reduce mmap_rss after chunkcache warmup

[cqy123456]

related pr: #35965

[codecov]

Codecov Report

Attention: Patch coverage is 9.09091% with 10 lines in your changes missing coverage. Please review.

Project coverage is 81.55%. Comparing base (919e96a) to head (f465e3c).
Report is 15 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/core/src/storage/ChunkCache.cpp	14.28%	6 Missing ⚠️
internal/core/src/segcore/SegmentSealedImpl.cpp	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #35974      +/-   ##
==========================================
- Coverage   85.01%   81.55%   -3.46%     
==========================================
  Files         984     1265     +281     
  Lines      125923   150477   +24554     
==========================================
+ Hits       107048   122724   +15676     
- Misses      13980    22880    +8900     
+ Partials     4895     4873      -22     

Files with missing lines	Coverage Δ
internal/core/src/storage/ChunkCache.h	100.00% <ø> (ø)
internal/core/src/segcore/SegmentSealedImpl.cpp	75.95% <0.00%> (ø)
internal/core/src/storage/ChunkCache.cpp	55.43% <14.28%> (ø)

... and 312 files with indirect coverage changes

[bigsheeper]

/lgtm

[czs007]

/approve

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cqy123456, czs007

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