util: fix the issue that memory usage not released after tracker Detach

[wshwsh12]

What problem does this PR solve?

Issue Number: ref #34571

Problem Summary:

What is changed and how it works?

We need the label to find children in the parent tracker
If we change the label after attach to some tracker, the tracker can't detach

tidb/util/memory/tracker.go

Lines 263 to 287 in 901f042

	func (t *Tracker) remove(oldChild *Tracker) {
	found := false
	label := oldChild.label
	t.mu.Lock()
	if t.mu.children != nil {
	children := t.mu.children[label]
	for i, child := range children {
	if child == oldChild {
	children = append(children[:i], children[i+1:]...)
	if len(children) > 0 {
	t.mu.children[label] = children
	} else {
	delete(t.mu.children, label)
	}
	found = true
	break
	}
	}
	}
	t.mu.Unlock()
	if found {
	oldChild.setParent(nil)
	t.Consume(-oldChild.BytesConsumed())
	}
	}

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• XuHuaiyu
• guo-shaoge

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[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/3d50b91d989dc505e6846d487035cfdf11c343ae

[wshwsh12]

/merge

[ti-chi-bot]

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

Commit hash: e93b23b

[hawkingrei]

/run-mysql-test

[sre-bot]

TiDB MergeCI notify

CI Name	Result	Duration	Compare with Parent commit
idc-jenkins-ci/integration-cdc-test	🟢 all 34 tests passed	26 min	Existing passed
idc-jenkins-ci-tidb/integration-common-test	🟢 all 11 tests passed	9 min 52 sec	Existing passed
idc-jenkins-ci-tidb/common-test	🟢 all 12 tests passed	8 min 16 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-1	🟢 all 26 tests passed	7 min 43 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-2	🟢 all 28 tests passed	5 min 21 sec	Existing passed
idc-jenkins-ci-tidb/integration-ddl-test	🟢 all 6 tests passed	4 min 53 sec	Existing passed
idc-jenkins-ci-tidb/tics-test	🟢 all 1 tests passed	4 min 42 sec	Existing passed
idc-jenkins-ci-tidb/mybatis-test	🟢 all 1 tests passed	3 min 24 sec	Existing passed
idc-jenkins-ci-tidb/integration-compatibility-test	🟢 all 1 tests passed	3 min 5 sec	Existing passed
idc-jenkins-ci-tidb/plugin-test	🟢 build success, plugin test success	4min	Existing passed