Add cgroup v2 support for memory limit (#18905)

internal/bpool/bpool.go

@@ -28,7 +28,7 @@ type BytePoolCap struct {
 
 // NewBytePoolCap creates a new BytePool bounded to the given maxSize, with new
 // byte arrays sized based on width.
-func NewBytePoolCap(maxSize int, width int, capwidth int) (bp *BytePoolCap) {
+func NewBytePoolCap(maxSize uint64, width int, capwidth int) (bp *BytePoolCap) {
 	if capwidth > 0 && capwidth < 64 {
 		panic("buffer capped with smaller than 64 bytes is not supported")
 	}