func (l *gcCPULimiterState) resetCapacity(now int64, nprocs int32) {
	if !l.tryLock() {
		// This must happen during a STW, so we can't fail to acquire the lock.
		// If we did, something went wrong. Throw.
		throw("failed to acquire lock to reset capacity")
	}
	// Flush the rest of the time for this period.
	l.updateLocked(now)
	l.nprocs = nprocs

	l.bucket.capacity = uint64(nprocs) * capacityPerProc

	}
	sched.procresizetime = now

	maskWords := (nprocs + 31) / 32

	// Grow allp if necessary.
	if nprocs > int32(len(allp)) {
		// Synchronize with retake, which could be running
		// concurrently since it doesn't run on a P.
		lock(&allpLock)
		if nprocs <= int32(cap(allp)) {
			allp = allp[:nprocs]
		} else {
			nallp := make([]*p, nprocs)
			// Copy everything up to allp's cap so we

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