testSysStat.add(-int64(p.summaryMappedReady))

	// Free the mapped space for chunks.
	for i := range p.chunks {
		if x := p.chunks[i]; x != nil {
			p.chunks[i] = nil
			// This memory comes from sysAlloc and will always be page-aligned.
			sysFree(unsafe.Pointer(x), unsafe.Sizeof(*p.chunks[0]), testSysStat)
		}
	}
}

// BaseChunkIdx is a convenient chunkIdx value which works on both

	bh := (*buckhashArray)(buckhash.Load())
	if bh == nil {
		lock(&profInsertLock)
		// check again under the lock
		bh = (*buckhashArray)(buckhash.Load())
		if bh == nil {
			bh = (*buckhashArray)(sysAlloc(unsafe.Sizeof(buckhashArray{}), &memstats.buckhash_sys))
			if bh == nil {
				throw("runtime: cannot allocate memory")
			}
			buckhash.StoreNoWB(unsafe.Pointer(bh))
		}
		unlock(&profInsertLock)
	}