// Put spare pages toward global credit.
			h.reclaimCredit.Add(nfound - npage)
			npage = 0
		}
	}
	if locked {
		unlock(&h.lock)
	}

	trace = traceAcquire()
	if trace.ok() {
		trace.GCSweepDone()
		traceRelease(trace)
	}
	releasem(mp)
}

// reclaimChunk sweeps unmarked spans that start at page indexes [pageIdx, pageIdx+n).
// It returns the number of pages returned to the heap.
//