common api returns value aligned with page size

Signed-off-by: Robin Lu <robin.lu@bytedance.com>

pkg/util/general/common.go

@@ -25,6 +25,7 @@ import (
 	"sort"
 	"strconv"
 	"strings"
+	"syscall"
 	"time"
 
 	"k8s.io/apimachinery/pkg/api/resource"
@@ -348,6 +349,13 @@ func Clamp(value, min, max float64) float64 {
 	return math.Max(math.Min(value, max), min)
 }
 
+// AlignToPageSize returns the value aligned with page size
+func AlignToPageSize(number uint64) uint64 {
+	pageSize := uint64(syscall.Getpagesize())
+	alignedNumber := (number + pageSize - 1) &^ (pageSize - 1)
+	return alignedNumber
+}
+
 // FormatMemoryQuantity aligned to Gi Mi Ki
 func FormatMemoryQuantity(q float64) string {
 	value := int64(q)

pkg/util/general/common_test.go

@@ -17,8 +17,10 @@ limitations under the License.
 package general
 
 import (
+	"syscall"
 	"testing"
 
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 	"k8s.io/apimachinery/pkg/util/sets"
 )
@@ -149,3 +151,16 @@ func TestFormatMemoryQutantity(t *testing.T) {
 	as.Equal("1.048576e+06[1Mi]", FormatMemoryQuantity(1<<20))
 	as.Equal("1.073741824e+09[1Gi]", FormatMemoryQuantity(1<<30))
 }
+
+func TestAlignToPageSize(t *testing.T) {
+	t.Parallel()
+	pageSize := uint64(syscall.Getpagesize())
+
+	// Test case 1: Number already aligned to page size
+	result := AlignToPageSize(pageSize * 2)
+	assert.Equal(t, pageSize*2, result, "Unexpected result for aligned number")
+
+	// Test case 2: Number smaller than page size
+	result = AlignToPageSize(pageSize - 1)
+	assert.Equal(t, pageSize, result, "Unexpected result for number smaller than page size")
+}