sys/kern/vfs_subr.c

303 int desiredvnodes;
315 	old_desiredvnodes = desiredvnodes;
318 	if (old_desiredvnodes != desiredvnodes) {
319 		wantfreevnodes = desiredvnodes / 4;
321 		vfs_hash_changesize(desiredvnodes);
322 		cache_changesize(desiredvnodes);
328     CTLTYPE_INT | CTLFLAG_MPSAFE | CTLFLAG_RW, &desiredvnodes, 0,
546 	 * physical memory size.  The ratio of desiredvnodes to the physical
547 	 * memory size is 1:16 until desiredvnodes exceeds 98,304.
549 	 * marginal ratio of desiredvnodes to the physical memory size is
550 	 * 1:64.  However, desiredvnodes is limited by the kernel's heap
551 	 * size.  The memory required by desiredvnodes vnodes and vm objects
558 	desiredvnodes = min(physvnodes, virtvnodes);
559 	if (desiredvnodes > MAXVNODES_MAX) {
562 			    desiredvnodes, MAXVNODES_MAX);
563 		desiredvnodes = MAXVNODES_MAX;
565 	wantfreevnodes = desiredvnodes / 4;
958 	target = count * (int64_t)gapvnodes / imax(desiredvnodes, 1);
1147 	gapvnodes = imax(desiredvnodes - wantfreevnodes, 100);
1150 	if (numvnodes > desiredvnodes)
1152 	space = desiredvnodes - numvnodes;
1181 		 * If numvnodes is too large (due to desiredvnodes being
1185 		if (numvnodes > desiredvnodes && freevnodes > 0)
1186 			vnlru_free_locked(ulmin(numvnodes - desiredvnodes,
1218 		if (numvnodes <= desiredvnodes)
1248 		if (onumvnodes > desiredvnodes && numvnodes <= desiredvnodes)
1363 	if (numvnodes >= desiredvnodes) {
1380 	if (numvnodes + 1 > desiredvnodes && freevnodes > 1)
1382 	return (numvnodes >= desiredvnodes ? ENFILE : 0);
1397 	if (numvnodes + count > desiredvnodes && freevnodes > wantfreevnodes)
1398 		vnlru_free_locked(ulmin(numvnodes + count - desiredvnodes,
1404 	if (atomic_fetchadd_long(&numvnodes, count) + count <= desiredvnodes) {
1424  * This hack is fragile, especially if desiredvnodes or wantvnodes are
1425  * misconfgured or changed significantly.  Reducing desiredvnodes below
1462 	if (numvnodes < desiredvnodes)
1478 	if (numvnodes + 1 <= desiredvnodes)