fix(scheduler): remove the defer function cost

[draveness]

/kind bug
/sig scheduling
/priority important-longterm

What this PR does / why we need it:

Remove the cost of the defer function in the scheduler perf test.

Without StopTimer

package main

import "testing"
import "time"

func test() {
	 // ...
}

func BenchmarkWithoutStopTimer(b *testing.B) {
	b.ResetTimer()

	for i := 0; i < b.N; i++ {
		test()
	}

	defer time.Sleep(1 * time.Second)
}

$ go test -bench=.
goos: darwin
goarch: amd64
pkg: github.com/golang
BenchmarkLocality-8   	       1	1001293479 ns/op
PASS
ok  	github.com/golang	1.010s
(base)

With StopTimer

package main

import "testing"
import "time"

func test() {
	 // ...
}

func BenchmarkLocality(b *testing.B) {
	b.ResetTimer()

	for i := 0; i < b.N; i++ {
	    test()
	}

	defer time.Sleep(1 * time.Second)
	b.StopTimer()
}

$ go test -bench=.
goos: darwin
goarch: amd64
pkg: github.com/golang
BenchmarkLocality-8   	   30000	     45513 ns/op
PASS
ok  	github.com/golang	5.866s
(base)

Which issue(s) this PR fixes:

ref: #81719

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[draveness]

/assign @Huang-Wei @ahg-g

[Huang-Wei]

LGTM. Let's put a comment explaining that without this line we're taking the overhead of defer() into account.

[SataQiu]

LGTM @draveness
Agree with @Huang-Wei . For readability, it is necessary to note why this line was added :)

[draveness]

done, PTAL

[SataQiu]

👍 @draveness
/lgtm
/approve

[ahg-g]

/lgtm

[draveness]

/retest

[Huang-Wei]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: draveness, Huang-Wei, SataQiu

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• test/integration/scheduler_perf/OWNERS [Huang-Wei]

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