server/core: add more benchmarks for region tree

[nolouch]

Signed-off-by: nolouch nolouch@gmail.com

What problem does this PR solve?

Issue Number: ref #4455

What is changed and how it works?

server/core: add more benchmarks for region tree

Check List

Tests

• Unit test
• Integration test

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024

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[codecov]

Codecov Report

Merging #4711 (0e2df0f) into master (2e22f1f) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head 0e2df0f differs from pull request most recent head 64eda05. Consider uploading reports for the commit 64eda05 to get more accurate results

@@            Coverage Diff             @@
##           master    #4711      +/-   ##
==========================================
- Coverage   75.07%   75.06%   -0.02%     
==========================================
  Files         284      284              
  Lines       27901    27888      -13     
==========================================
- Hits        20947    20934      -13     
+ Misses       5089     5086       -3     
- Partials     1865     1868       +3     

Flag	Coverage Δ
unittests	75.06% <ø> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
server/storage/kv/etcd_kv.go	69.56% <0.00%> (-10.15%)	⬇️
server/tso/tso.go	62.85% <0.00%> (-4.00%)	⬇️
server/storage/hot_region_storage.go	79.88% <0.00%> (-2.30%)	⬇️
server/api/region.go	67.17% <0.00%> (-2.03%)	⬇️
server/election/lease.go	86.15% <0.00%> (-1.54%)	⬇️
server/handler.go	51.22% <0.00%> (-1.42%)	⬇️
server/config/persist_options.go	92.85% <0.00%> (-0.76%)	⬇️
server/grpc_service.go	51.58% <0.00%> (-0.28%)	⬇️
server/schedulers/hot_region.go	83.38% <0.00%> (+0.30%)	⬆️
pkg/btree/btree.go	88.13% <0.00%> (+0.75%)	⬆️
... and 9 more

---

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[AndreMouche]

LGTM

[ti-chi-bot]

@AndreMouche: Thanks for your review. The bot only counts approvals from reviewers and higher roles in list, but you're still welcome to leave your comments.

In response to this:

LGTM

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[nolouch]

/merge

[ti-chi-bot]

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

/run-all-tests

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[ti-chi-bot]

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

Commit hash: 0e2df0f