// result to set all the bits.
	return ^((x - (x >> (m - 1))) | x)
}

// findScavengeCandidate returns a start index and a size for this pallocData
// segment which represents a contiguous region of free and unscavenged memory.
//
// searchIdx indicates the page index within this chunk to start the search, but
// note that findScavengeCandidate searches backwards through the pallocData. As

				want: BitRange{PallocChunkPages - 1, 1},
			}
		}
	}
	for name, v := range tests {
		v := v
		t.Run(name, func(t *testing.T) {
			b := makePallocData(v.alloc, v.scavenged)
			start, size := b.FindScavengeCandidate(PallocChunkPages-1, v.min, v.max)
			got := BitRange{start, size}
			if !(got.N == 0 && v.want.N == 0) && got != v.want {
				t.Fatalf("candidate mismatch: got %v, want %v", got, v.want)
			}
		})
	}
}

		} else {
			str += "0"
		}
	}
	return str
}

// Expose pallocData for testing.
type PallocData pallocData

func (d *PallocData) FindScavengeCandidate(searchIdx uint, min, max uintptr) (uint, uint) {
	return (*pallocData)(d).findScavengeCandidate(searchIdx, min, max)
}
func (d *PallocData) AllocRange(i, n uint) { (*pallocData)(d).allocRange(i, n) }
func (d *PallocData) ScavengedSetRange(i, n uint) {