releasedEager := mheap_.pages.scav.releasedEager.Load()

				// Print the line.
				printScavTrace(releasedBg, releasedEager, false)

				// Update the stats.
				mheap_.pages.scav.releasedBg.Add(-releasedBg)
				mheap_.pages.scav.releasedEager.Add(-releasedEager)
				unlock(&mheap_.lock)
			})
		}
		scavenger.ready()
	}

	gp.m.locks--
	return npages
}

// Each chunk must be a multiple of the heap arena size, or the heap arena size must
// be divisible by the arena chunks. The address space for each chunk, and each
// corresponding heapArena for that address space, are eternally reserved for use as
// arena chunks. That is, they can never be used for the general heap. Each chunk
// is also represented by a single mspan, and is modeled as a single large heap

	lockRankGscan:           "gscan",
	lockRankStackpool:       "stackpool",
	lockRankStackLarge:      "stackLarge",
	lockRankHchanLeaf:       "hchanLeaf",
	lockRankWbufSpans:       "wbufSpans",
	lockRankMheap:           "mheap",
	lockRankMheapSpecial:    "mheapSpecial",
	lockRankGlobalAlloc:     "globalAlloc",
	lockRankTrace:           "trace",
	lockRankTraceStackTab:   "traceStackTab",
	lockRankPanic:           "panic",

// time, but may take time proportional to the size of the mapped heap beyond that.
//
// The heap lock must not be held over this operation, since it will briefly acquire
// the heap lock.
//
// Must be called on the system stack because it acquires the heap lock.
//
//go:systemstack
func (p *pageAlloc) enableChunkHugePages() {
	// Grab the heap lock to turn on huge pages for new chunks and clone the current

		t.FailNow()
	}
}

type acLink struct {
	x [1 << 20]byte
}

var arenaCollisionSink []*acLink

func TestArenaCollision(t *testing.T) {
	testenv.MustHaveExec(t)

	// Test that mheap.sysAlloc handles collisions with other
	// memory mappings.
	if os.Getenv("TEST_ARENA_COLLISION") != "1" {
		cmd := testenv.CleanCmdEnv(exec.Command(os.Args[0], "-test.run=^TestArenaCollision$", "-test.v"))

	// Mallocs is the cumulative count of heap objects allocated.
	// The number of live objects is Mallocs - Frees.
	Mallocs uint64

	// Frees is the cumulative count of heap objects freed.
	Frees uint64

	// Heap memory statistics.
	//
	// Interpreting the heap statistics requires some knowledge of
	// how Go organizes memory. Go divides the virtual address
	// space of the heap into "spans", which are contiguous

	a.gcCyclesForced = uint64(memstats.numforcedgc)

	systemstack(func() {
		lock(&mheap_.lock)
		a.mSpanSys = memstats.mspan_sys.load()
		a.mSpanInUse = uint64(mheap_.spanalloc.inuse)
		a.mCacheSys = memstats.mcache_sys.load()
		a.mCacheInUse = uint64(mheap_.cachealloc.inuse)
		unlock(&mheap_.lock)
	})
}

// cpuStatsAggregate represents CPU stats obtained from the runtime

}

// dummy mspan that contains no free objects.
var emptymspan mspan

func allocmcache() *mcache {
	var c *mcache
	systemstack(func() {
		lock(&mheap_.lock)
		c = (*mcache)(mheap_.cachealloc.alloc())
		c.flushGen.Store(mheap_.sweepgen)
		unlock(&mheap_.lock)
	})
	for i := range c.alloc {
		c.alloc[i] = &emptymspan
	}
	c.nextSample = nextSample()
	return c
}

					// Keep the first window.
					goto keep
				} else {
					// Replace it with this window.
					heap.Remove(&acc.wHeap, i)
					break
				}
			}
		}

		heap.Push(&acc.wHeap, UtilWindow{time, mu})
		if len(acc.wHeap) > acc.nWorst {
			heap.Pop(&acc.wHeap)
		}
	keep:
	}

	if len(acc.wHeap) < acc.nWorst {
		// We don't have N windows yet, so keep accumulating.
		acc.bound = 1.0
	} else {

// obj must point to the beginning of a heap object or an oblet.
//
//go:nowritebarrierrec
func (w *gcWork) put(obj uintptr) {
	flushed := false
	wbuf := w.wbuf1
	// Record that this may acquire the wbufSpans or heap lock to
	// allocate a workbuf.
	lockWithRankMayAcquire(&work.wbufSpans.lock, lockRankWbufSpans)
	lockWithRankMayAcquire(&mheap_.lock, lockRankMheap)
	if wbuf == nil {
		w.init()